Wechselwirkungen von Dextromethorphan und Chinidin

…such as propranolol Cyclopropane or halogenated hydrocarbon anesthetics, such as halothane Antihistamines Thyroid hormones Diuretics Cardiac glycosides, such as digitalis glycosides Quinidine Drugs potentiating hypokalemic effects of epinephrine • Potassium depleting diuretics • Corticosteroids • Theophylline Epinephrine should not be used to counteract circulatory… (Fachinformation zu Adrenalin, Arzneimittelwechselwirkungen)

Serotonin Syndrome: Increased risk when co-administered with serotonergic agents (e.g., SSRIs, SNRIs, triptans), but also during overdosage situations. (Fachinformation zu Amfetamin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin Syndrome: Increased risk when coadministered with serotonergic agents (e.g., selective serotonin reuptake inhibitors (SSRIs), serotonin norepinephrine reuptake inhibitors (SNRIs), triptans), but also during overdosage situations. (Fachinformation zu Amfetamin und Dexamfetamin, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

The use of SAPHRIS should be avoided in combination with other drugs known to prolong QTc including Class 1A antiarrhythmics (e.g., quinidine, procainamide) or Class 3 antiarrhythmics (e.g., amiodarone, sotalol), antipsychotic medications (e.g., ziprasidone, chlorpromazine, thioridazine), and antibiotics (e.g., gatifloxacin, moxifloxacin). (Fachinformation zu Asenapin, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

…bradyarrhythmias or uncompensated heart failure • patients on drugs known to prolong the QT interval • patients with ongoing proarrhythmic conditions such as uncorrected hypokalemia or hypomagnesemia, clinically significant bradycardia, and in patients receiving Class IA (quinidine, procainamide) or Class III (dofetilide, amiodarone, sotalol) antiarrhythmic agents. (Fachinformation zu Azithromycin, Warnhinweise und Vorsichtsmaßnahmen)

• Serotonergic Drugs: Concomitant use may result in serotonin syndrome. (Fachinformation zu Belladonna und Opium, Arzneimittelwechselwirkungen)

Serotonergic Drugs : Concomitant use may result in serotonin syndrome. (Fachinformation zu Buprenorphin, Arzneimittelwechselwirkungen)

Serotonergic Drugs: Concomitant use may result in serotonin syndrome. (Fachinformation zu Buprenorphin und Naloxon, Arzneimittelwechselwirkungen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin Syndrome The development of a potentially life-threatening serotonin syndrome has been reported with SNRIs SSRIs, and other serotonergic drugs, including buspirone, alone but particularly with concomitant use of other serotonergic drugs (including triptans), with drugs that impair metabolism of serotonin (in particular, MAOIs, including reversible MAOIs… (Fachinformation zu Buspiron, Warnhinweise)

Examples paroxetine, fluoxetine, bupropion, quinidine Benzodiazepines and other Central Nervous System (CNS) Depressants Clinical Impact: Due to additive pharmacologic effect, the concomitant use of benzodiazepines or other CNS depressants including alcohol, increases the risk of respiratory depression, profound sedation, coma, and death. (Fachinformation zu Butalbital, Acetylsalicylsäure, Koffein und Codein, Arzneimittelwechselwirkungen)

Examples: paroxetine, fluoxetine, bupropion, quinidine Benzodiazepines and Other Central Nervous System (CNS) Depressants Clinical Impact: Due to additive pharmacologic effect, the concomitant use of benzodiazepines or other CNS depressants, including alcohol, can increase the risk of hypotension, respiratory depression, profound sedation, coma, and death. (Fachinformation zu Butalbital, Paracetamol, Koffein und Codein, Arzneimittelwechselwirkungen)

…medical attention if they ‎experience symptoms of hyperalgesia, including worsening pain, increased ‎sensitivity to pain, or new pain [see WARNINGS ; ADVERSE REACTIONS ].‎ Serotonin Syndrome Inform patients that butorphanol tartrate could cause a rare but potentially life-threatening condition resulting from concomitant administration of serotonergic drugs. (Fachinformation zu Butorphanol, Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Thrombocytopenia and Other Hypersensitivity Reactions Quinidine can cause immune-mediated thrombocytopenia that can be severe or fatal. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Concomitant use with quinidine, quinine, or mefloquine. (Fachinformation zu Dextromethorphan und Chinidin, Gegenanzeigen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

…syndrome, uncorrected electrolyte imbalance, such as hypokalemia or hypomagnesemia and cardiac disease, such as heart failure, myocardial infarction, or bradycardia), and patients receiving Class IA antiarrhythmic agents (quinidine, procainamide), or Class III antiarrhythmic agents (amiodarone, sotalol), tricyclic antidepressants, macrolides, and antipsychotics. (Fachinformation zu Ciprofloxacin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Interactions with Drugs Affecting Cytochrome P450 Isoenzymes The effects of concomitant use or discontinuation of cytochrome P450 3A4 inducers, 3A4 inhibitors, or 2D6 inhibitors with codeine are complex. (Fachinformation zu Codein, Boxed Warning (umrahmter Warnhinweis))

If serotonin syndrome symptoms occur with the use of other serotonergic drugs, immediately discontinue TONMYA. (Fachinformation zu Cyclobenzaprin, Arzneimittelwechselwirkungen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

The dose of desipramine can then be adjusted based on clinical response; however, a dose above 40 mg/day is not recommended. (Fachinformation zu Dextromethorphan und Chinidin, Arzneimittelwechselwirkungen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin Syndrome Serotonin syndrome, a potentially life-threatening reaction, may occur when amphetamines are used in combination with other drugs that affect the serotonergic neurotransmitter systems such as monoamine oxidase inhibitors (MAOIs), selective serotonin reuptake inhibitors (SSRIs), serotonin norepinephrine reuptake inhibitors (SNRIs), triptans,… (Fachinformation zu Dexamfetamin, Warnhinweise)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Concomitant Antiarrhythmic Therapy The concomitant use of Norpace or Norpace CR with other Type 1A antiarrhythmic agents (such as quinidine or procainamide), Type 1C antiarrhythmics (such as encainide, flecainide or propafenone), and/or propranolol should be reserved for patients with life-threatening arrhythmias who are demonstrably unresponsive to single-agent… (Fachinformation zu Disopyramid, Warnhinweise)

Use with Drugs that Prolong QT Interval and Antiarrhythmic Agents The use of dofetilide in conjunction with other drugs that prolong the QT interval has not been studied and is not recommended. (Fachinformation zu Dofetilid, Warnhinweise)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Concomitant use of COMPLERA with drugs with a known risk to prolong the QTc interval of the electrocardiogram may increase the risk of Torsade de Pointes. (Fachinformation zu Emtricitabin, Rilpivirin und Tenofovir, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

• Serotonin Syndrome : Potentially life-threatening condition could result from concomitant serotonergic drug administration. (Fachinformation zu Fentanyl, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

(See DOSAGE and ADMINISTRATION. ) Because of the risk of QT prolongation and the potential for torsades de pointes, the use of FOSCAVIR should be avoided in combination with agents known to prolong the QT interval including Class IA (e.g., quinidine or procainamide) or Class III (e.g., dofetilide, amiodarone, sotalol) antiarrhythmic agents, phenothiazines, tricyclic… (Fachinformation zu Foscarnet, Arzneimittelwechselwirkungen)

Avoid co-administration of CONTEPO with drugs known to prolong the QT interval. (Fachinformation zu Fosfomycin, Arzneimittelwechselwirkungen)

Patients should be monitored for the emergence of serotonin syndrome, especially with concomitant use of granisetron and other serotonergic drugs. (Fachinformation zu Granisetron, Warnhinweise und Vorsichtsmaßnahmen)

Example: lactulose Serotonergic Drugs : Concomitant use may result in serotonin syndrome. (Fachinformation zu Hydrocodon, Arzneimittelwechselwirkungen)

Serotonergic drugs : Concomitant use may result in serotonin syndrome. (Fachinformation zu Hydrocodon und Chlorphenamin, Arzneimittelwechselwirkungen)

Serotonergic Drugs : Concomitant use may result in serotonin syndrome. (Fachinformation zu Hydrocodon und Homatropin, Arzneimittelwechselwirkungen)

S er otonin Syndrome Inform patients that opioids could cause a rare but potentially life-threatening condition resulting from concomitant administration of serotonergic drugs. (Fachinformation zu Hydrocodon und Ibuprofen, Vorsichtsmaßnahmen)

Serotonin Syndrome Inform patients that hydrocodone bitartrate and acetaminophen tablets could cause a rare but potentially life-threatening condition resulting from concomitant administration of serotonergic drugs. (Fachinformation zu Hydrocodon und Paracetamol, Vorsichtsmaßnahmen)

• Serotonergic Drugs : Concomitant use may result in serotonin syndrome. (Fachinformation zu Hydromorphon, Arzneimittelwechselwirkungen)

Therefore, PLAQUENIL is not recommended in patients taking other drugs that have the potential to prolong the QT interval. (Fachinformation zu Hydroxychloroquin, Warnhinweise und Vorsichtsmaßnahmen)

Avoid the use of FANAPT in combination with any other drugs that prolong the QT interval [see Warnings and Precautions (5.3) ] . (Fachinformation zu Iloperidon, Arzneimittelwechselwirkungen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Use with an MAOI or within 14 days of stopping an MAOI. (Fachinformation zu Dextromethorphan und Chinidin, Gegenanzeigen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Bradycardia may increase the risk of QT prolongation which may lead to severe ventricular arrhythmias, including torsade de pointes, especially in patients with risk factors such as use of QTc prolonging drugs [see Adverse Reactions ( 6.2 )] . (Fachinformation zu Ivabradin, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Die Kombination von Johanniskraut mit Antidepressiva und anderen serotonergen Arzneimitteln erhöht das Risiko eines Serotoninsyndroms. (NCCIH, St. John's Wort)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Since it cannot be excluded that Lanreotide Injection may have this effect, avoid other drugs mainly metabolized by CYP3A4 and which have a low therapeutic index (e.g., quinidine, terfenadine). (Fachinformation zu Lanreotid, Arzneimittelwechselwirkungen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Levofloxacin should be avoided in patients with known prolongation of the QT interval, patients with uncorrected hypokalemia, and patients receiving Class IA (quinidine, procainamide), or Class III (amiodarone, sotalol) antiarrhythmic agents. (Fachinformation zu Levofloxacin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin Syndrome Inform patients that opioids could cause a rare but potentially life-threatening condition resulting from concomitant administration of serotonergic drugs. (Fachinformation zu Levorphanol, Vorsichtsmaßnahmen)

Use with an MAOI or within 14 days of stopping an MAOI. (Fachinformation zu Dextromethorphan und Chinidin, Gegenanzeigen)

Serotonin Syndrome: Increased risk when co-administered with serotonergic agents (e.g., SSRIs, SNRIs, triptans), but also during overdosage situations. (Fachinformation zu Lisdexamfetamin, Warnhinweise und Vorsichtsmaßnahmen)

If concomitant use of lithium with other serotonergic drugs is clinically warranted, inform patients of the increased risk for serotonin syndrome and monitor for symptoms. (Fachinformation zu Lithium, Warnhinweise und Vorsichtsmaßnahmen)

Avoid loperamide hydrochloride capsules in: • combination with others drugs or herbal products that are known to prolong the QT interval, including Class 1A (e.g., quinidine, procainamide) or Class III (e.g., amiodarone, sotalol) antiarrhythmics, antipsychotics (e.g., chlorpromazine, haloperidol, thioridazine, ziprasidone), antibiotics (e.g., moxifloxacin), or… (Fachinformation zu Loperamid, Warnhinweise)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Concomitant use with quinidine, quinine, or mefloquine. (Fachinformation zu Dextromethorphan und Chinidin, Gegenanzeigen)

Serotonin Syndrome: Increased risk when coadministered with serotonergic agents (e.g., SSRIs, SNRIs, triptans), but also during overdosage situations. (Fachinformation zu Metamfetamin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin syndrome has resulted from concomitant use of metaxalone (within the recommended dosage range) and other serotonergic drugs [see Warnings and Precautions (5.1) ]. (Fachinformation zu Metaxalon, Arzneimittelwechselwirkungen)

Interactions with Drugs Affecting Cytochrome P450 Isoenzymes The concomitant use of METHADOSE with all cytochrome P450 3A4, 2B6, 2C19, 2C9 or 2D6 inhibitors may result in an increase in methadone plasma concentrations, which could cause potentially fatal respiratory depression. (Fachinformation zu Methadon, Boxed Warning (umrahmter Warnhinweis))

Use with an MAOI or within 14 days of stopping an MAOI. (Fachinformation zu Dextromethorphan und Chinidin, Gegenanzeigen)

CYP2D6 Inhibitors Monitor patients closely when the combination use of CYP2D6 inhibitor and metoprolol cannot be avoided. (Fachinformation zu Metoprolol, Arzneimittelwechselwirkungen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

• Serotonin Syndrome : Increased risk when co-administered with other serotonergic agents, but also when taken alone. (Fachinformation zu Milnacipran, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

• Serotonergic Drugs: Concomitant use may result in serotonin syndrome. (Fachinformation zu Morphin, Arzneimittelwechselwirkungen)

The drug should be avoided in patients with known prolongation of the QT interval, patients with uncorrected hypokalemia and patients receiving Class IA (for example, quinidine, procainamide) or Class III (for example, amiodarone, sotalol) antiarrhythmic agents, due to the lack of clinical experience with the drug in these patient populations. (Fachinformation zu Moxifloxacin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Ofloxacin should be avoided in patients with known prolongation of the QT interval, patients with uncorrected hypokalemia, and patients receiving Class IA (quinidine, procainamide), or Class III (amiodarone, sotalol) antiarrhythmic agents. (Fachinformation zu Ofloxacin, Vorsichtsmaßnahmen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonergic Drugs : Concomitant use may result in serotonin syndrome. (Fachinformation zu Oliceridin, Arzneimittelwechselwirkungen)

Patients should be monitored for the emergence of serotonin syndrome, especially with concomitant use of Ondansetron Injection and other serotonergic drugs. (Fachinformation zu Ondansetron, Warnhinweise und Vorsichtsmaßnahmen)

Avoid coadministration of oxaliplatin injection with medicinal products with a known potential to prolong the QT interval. (Fachinformation zu Oxaliplatin, Arzneimittelwechselwirkungen)

Serotonergic Drug s: Concomitant use may result in serotonin syndrome. (Fachinformation zu Oxycodon, Arzneimittelwechselwirkungen)

Serotonergic Drugs : Concomitant use may result in serotonin syndrome. (Fachinformation zu Oxymorphon, Arzneimittelwechselwirkungen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Patients should be monitored for the emergence of serotonin syndrome, especially with concomitant use of POSFREA and other serotonergic drugs. (Fachinformation zu Palonosetron, Warnhinweise und Vorsichtsmaßnahmen)

Interactions with Drugs Affecting Cytochrome P450 Isoenzymes The effects of concomitant use or discontinuation of cytochrome P450 3A4 inducers, 3A4 inhibitors, or 2D6 inhibitors with codeine are complex. (Fachinformation zu Paracetamol und Codein, Boxed Warning (umrahmter Warnhinweis))

The dose of paroxetine can then be adjusted based on clinical response; however, dosage above 35 mg/day is not recommended. (Fachinformation zu Dextromethorphan und Chinidin, Arzneimittelwechselwirkungen)

Avoid coadministration of VOTRIENT with drugs known to prolong the QT/QTc interval. (Fachinformation zu Pazopanib, Arzneimittelwechselwirkungen)

Serotonin Syndrome Inform patients that opioids could cause a rare but potentially life-threatening condition resulting from concomitant administration of serotonergic drugs. (Fachinformation zu Pentazocin und Naloxon, Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Use with an MAOI or within 14 days of stopping an MAOI. (Fachinformation zu Dextromethorphan und Chinidin, Gegenanzeigen)

Drugs that Prolong the QT Interval : Avoid concomitant use. (Fachinformation zu Phenobarbital, Arzneimittelwechselwirkungen)

…use of NUPLAZID should be avoided in patients with known QT prolongation or in combination with other drugs known to prolong QT interval including Class 1A antiarrhythmics (e.g., quinidine, procainamide) or Class 3 antiarrhythmics (e.g., amiodarone, sotalol), certain antipsychotic medications (e.g., ziprasidone, chlorpromazine, thioridazine), and certain antibiotics… (Fachinformation zu Pimavanserin, Warnhinweise und Vorsichtsmaßnahmen)

Concomitant use with drugs that both prolong QT interval and are metabolized by CYP2D6 (e.g., thioridazine or pimozide). (Fachinformation zu Dextromethorphan und Chinidin, Gegenanzeigen)

The use of WAKIX should be avoided in patients with known QT prolongation or in combination with other drugs known to prolong the QT interval [see Drug Interactions ( 7.1 )]. (Fachinformation zu Pitolisant, Warnhinweise und Vorsichtsmaßnahmen)

Class Ia (e.g., quinidine, procainamide) and Class III (e.g., amiodarone, sotalol) anti-arrhythmic drugs have been associated with cases of Torsades de Pointes in patients with bradycardia. (Fachinformation zu Ponesimod, Arzneimittelwechselwirkungen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Interactions with Drugs Affecting Cytochrome P450 Isoenzymes The effects of concomitant use or discontinuation of cytochrome P450 3A4 inducers, 3A4 inhibitors, or 2D6 inhibitors with codeine are complex, requiring careful consideration of the effects on the parent drug, codeine, and the active metabolite, morphine. (Fachinformation zu Promethazin und Codein, Boxed Warning (umrahmter Warnhinweis))

Avoid the use of propafenone with Class IA and III antiarrhythmic agents (including quinidine and amiodarone). (Fachinformation zu Propafenon, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Use with an MAOI or within 14 days of stopping an MAOI. (Fachinformation zu Dextromethorphan und Chinidin, Gegenanzeigen)

• Serotonin Syndrome : Potentially life-threatening condition could result from concomitant serotonergic drug administration. (Fachinformation zu Remifentanil, Warnhinweise und Vorsichtsmaßnahmen)

…exposure Progestins Anticonvulsants Phenytoin Administered with rifampin 450 mg daily Decrease exposure Antiarrhythmics Disopyramide Decrease exposure Mexiletine Decrease exposure Quinidine Decrease exposure Propafenone Decrease AUC by 50%-67% Tocainide Decrease exposure Antiestrogens Tamoxifen Decrease AUC by 86% Toremifene Decrease steady state concentrations… (Fachinformation zu Rifampicin, Arzneimittelwechselwirkungen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Use with an MAOI or within 14 days of stopping an MAOI. (Fachinformation zu Dextromethorphan und Chinidin, Gegenanzeigen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Class Ia antiarrhythmic drugs, such as disopyramide, quinidine, and procainamide, and other Class III drugs (for example, amiodarone) are not recommended as concomitant therapy, because of their potential for additive QTc prolongation [see Warnings and Precautions ( 5.1 )]. (Fachinformation zu Sotalol, Arzneimittelwechselwirkungen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Certain conditions may increase the risk for torsade de pointes or sudden death such as (1) bradycardia; (2) hypokalemia or hypomagnesemia; (3) concomitant use of other drugs that prolong the QTc interval; and (4) presence of congenital prolongation of the QT interval [see Warnings and Precautions ( 5.8 ), Clinical Pharmacology (12.2) ]. (Fachinformation zu Tetrabenazin, Arzneimittelwechselwirkungen)

Concomitant use with drugs that both prolong QT interval and are metabolized by CYP2D6 (e.g., thioridazine or pimozide). (Fachinformation zu Dextromethorphan und Chinidin, Gegenanzeigen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

The effects of concomitant use or discontinuation of cytochrome P450 3A4 inducers, 3A4 inhibitors, or 2D6 inhibitors with tramadol are complex. (Fachinformation zu Tramadol, Boxed Warning (umrahmter Warnhinweis))

Interactions with Drugs Affecting Cytochrome P450 Isoenzymes The effects of concomitant use or discontinuation of cytochrome P450 3A4 inducers, 3A4 inhibitors, or 2D6 inhibitors with tramadol are complex. (Fachinformation zu Tramadol und Paracetamol, Boxed Warning (umrahmter Warnhinweis))

Use with an MAOI or within 14 days of stopping an MAOI. (Fachinformation zu Dextromethorphan und Chinidin, Gegenanzeigen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Patients taking Class 1A (for example. quinidine, procainamide) or Class III (for example, amiodarone, sotalol) antiarrhythmic medications or those with congenital QT prolongation, should avoid using vardenafil hydrochloride tablets. (Fachinformation zu Vardenafil, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Avoid concomitant use of VEPPANU with strong CYP3A inhibitors or drugs known to prolong the QTc interval. (Fachinformation zu Vepdegestrant, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor ECG if concomitant use of drugs that prolong QT interval cannot be avoided or if concomitant CYP3A4 inhibitors used. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Serotonin syndrome: Use of NUEDEXTA with selective serotonin reuptake inhibitor (SSRIs) or tricyclic antidepressants increases the risk. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Therefore, ziprasidone should not be given with: • dofetilide, sotalol, quinidine, other Class Ia and III anti-arrhythmics, mesoridazine, thioridazine, chlorpromazine, droperidol, pimozide, sparfloxacin, gatifloxacin, moxifloxacin, halofantrine, mefloquine, pentamidine, arsenic trioxide, levomethadyl acetate, dolasetron mesylate, probucol or tacrolimus. (Fachinformation zu Ziprasidon, Gegenanzeigen)

Acetazolamide reduces urinary excretion of quinidine and may enhance its effect. (Fachinformation zu Acetazolamid, Arzneimittelwechselwirkungen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Effect of P-glycoprotein (P-gp) Inhibitors and Inducers Concomitant taking of P-gp inhibitors (including but not limited to ritonavir, cyclosporine A, ketoconazole, itraconazole, erythromycin, verapamil, quinidine, tacrolimus, nelfinavir, saquinavir, and amiodarone) with GILOTRIF can increase exposure to afatinib [see Clinical Pharmacology (12.3) ]. (Fachinformation zu Afatinib, Arzneimittelwechselwirkungen)

Alcohol As with any other CNS drug, caution should be used when NUEDEXTA is taken in combination with other centrally acting drugs and alcohol. (Fachinformation zu Dextromethorphan und Chinidin, Arzneimittelwechselwirkungen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

MAO inhibitors, tricyclic antidepressants and drugs that prolong the QTc interval may potentiate effect on the cardiovascular system. (Fachinformation zu Arformoterol, Arzneimittelwechselwirkungen)

CYP2D6 inhibitors and CYP3A4 Inhibitors : See full prescribing information for ABILIFY MAINTENA dosage modifications when used concomitantly with CYP2D6 inhibitors and/or CYP3A4 inhibitors for greater than 14 days ( 7.1 ) (Fachinformation zu Aripiprazol, Arzneimittelwechselwirkungen)

Strong CYP2D6 Inhibitors Prevention or Management With concomitant use of atomoxetine oral solution and a strong CYP2D6 inhibitor 1 , increase the titration interval [see Dosage and Administration (2.5) and Clinical Pharmacology (12.3) ] . (Fachinformation zu Atomoxetin, Arzneimittelwechselwirkungen)

Drug Interactions Drugs which may enhance the neuromuscular blocking action of atracurium include: enflurane; isoflurane; halothane; certain antibiotics, especially the aminoglycosides and polymyxins; lithium; magnesium salts; procainamide; and quinidine. (Fachinformation zu Atracurium, Arzneimittelwechselwirkungen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Drugs that Prolong the QT interval QT prolongation has been reported with metronidazole, a component of bismuth subcitrate potassium, metronidazole and tetracycline hydrochloride, particularly when administered with drugs with the potential for prolonging the QT interval. (Fachinformation zu Bismutsubcitrat, Metronidazol und Tetracyclin, Warnhinweise und Vorsichtsmaßnahmen)

Strong CYP2D6 REXULTI may be administered without dosage adjustment in patients with MDD when administered with strong CYP2D6 inhibitors (e.g., paroxetine, fluoxetine). or CYP3A4 inhibitors Administer half of recommended dosage. (Fachinformation zu Brexpiprazol, Arzneimittelwechselwirkungen)

CYP2D6 inhibitors may potentiate systemic beta-blockade. (Fachinformation zu Brimonidin und Timolol, Arzneimittelwechselwirkungen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

CYP2D6 Inhibitors and Poor Metabolizers Interactions of carvedilol with potent inhibitors of CYP2D6 isoenzyme (such as quinidine, fluoxetine, paroxetine, and propafenone) have not been studied, but these drugs would be expected to increase blood levels of the R(+) enantiomer of carvedilol [see Clinical Pharmacology (12.3) ]. (Fachinformation zu Carvedilol, Arzneimittelwechselwirkungen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

QT Interval Prolongation and V entricular A rr h ythmia Decreases in serum calcium can also prolong the QT interval, potentially resulting in ventricular arrhythmia. (Fachinformation zu Cinacalcet, Warnhinweise und Vorsichtsmaßnahmen)

Potentiation of Neuromuscular Blockade Certain drugs may enhance the neuromuscular blocking action of Cisatracurium Besylate Injection including inhalational anesthetics, antibiotics, magnesium salts, lithium, local anesthetics, procainamide and quinidine [see Drug Interactions ( 7.1 )] . (Fachinformation zu Cisatracurium, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

The use of the P-gp inhibitors verapamil, amiodarone, quinidine, clarithromycin, and ticagrelor does not require a dosage adjustment of PRADAXA. (Fachinformation zu Dabigatran, Arzneimittelwechselwirkungen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

…ergotamine, everolimus, felodipine, fentanyl, hormonal contraceptive agents, indinavir, fluticasone, lopinavir, lovastatin, lurasidone, maraviroc, midazolam, nisoldipine, pimozide, quetiapine, quinidine, saquinavir, sildenafil, simvastatin, sirolimus, tacrolimus, tolvaptan, tipranavir, triazolam, ticagrelor, and vardenafil) [see Clinical Pharmacology (12.3)] . (Fachinformation zu Deferasirox, Arzneimittelwechselwirkungen)

Carefully monitor cardiac rhythm when administering SUPRANE to susceptible patients (e.g., patients with congenital Long QT Syndrome or patients taking drugs that can prolong the QT interval). (Fachinformation zu Desfluran, Warnhinweise und Vorsichtsmaßnahmen)

Concomitant use of strong CYP2D6 inhibitors: Maximum recommended dose of AUSTEDO XR or AUSTEDO is 36 mg per day ( 2.3 , 7.1 ) (Fachinformation zu Deutetrabenazin, Arzneimittelwechselwirkungen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Digoxin: Increased digoxin substrate plasma concentration may occur. (Fachinformation zu Dextromethorphan und Chinidin, Arzneimittelwechselwirkungen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

CYP2D6 inhibitors may potentiate systemic beta-blockade. (Fachinformation zu Dorzolamid und Timolol, Arzneimittelwechselwirkungen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

…cardiac disease, 3) treatment with Class I and Class III antiarrhythmics, 4) treatment with monoamine oxidase inhibitors (MAOI's), 5) concomitant treatment with other drug products known to prolong the QT interval (see PRECAUTIONS, Drug Interactions ), and 6) electrolyte imbalance, in particular hypokalemia and hypomagnesemia, or concomitant treatment with drugs… (Fachinformation zu Droperidol, Warnhinweise)

Use caution in combination with moderate CYP3A4 inhibitors (e.g., erythromycin) or strong (e.g., paroxetine) or moderate CYP2D6 inhibitors, a combination of both CYP3A4 and CYP2D6 inhibitors, or known poor metabolizers of CYP2D6. (Fachinformation zu Dutasterid und Tamsulosin, Warnhinweise und Vorsichtsmaßnahmen)

QT Prolongation: Monitor for prolonged QT intervals in patients with congestive heart failure, bradyarrhythmias, drugs known to prolong the QT interval, and electrolyte abnormalities. (Fachinformation zu Eribulin, Warnhinweise und Vorsichtsmaßnahmen)

The serum digoxin concentrations should be monitored and used for titration of the digoxin dose to obtain the desired clinical effect. amiodarone bepridil disopyramide flecainide lidocaine (systemic) mexiletine propafenone quinidine ↓ antiarrhythmics Concentrations of these antiarrhythmics may be decreased when co-administered with Etravirine. (Fachinformation zu Etravirin, Arzneimittelwechselwirkungen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

(See DOSAGE AND ADMINISTRATION ) Drugs that inhibit cytochrome P450IID6, such as quinidine , might increase the plasma concentrations of flecainide in patients that are on chronic flecainide therapy; especially if these patients are extensive metabolizers. (Fachinformation zu Flecainid, Arzneimittelwechselwirkungen)

…Antidepressants, QTc Prolonging Drugs Formoterol, as with other beta 2 -agonists, should be administered with extreme caution to patients being treated with monoamine oxidase inhibitors, tricyclic antidepressants, or drugs known to prolong the QTc interval because the effect of adrenergic agonists on the cardiovascular system may be potentiated by these agents. (Fachinformation zu Formoterol, Arzneimittelwechselwirkungen)

Other Corticosteroids, doxycycline, estrogens, furosemide, oral contraceptives, paroxetine, quinidine, rifampin, sertraline, theophylline, and vitamin D Drugs whose level is decreased by phenytoin Anticoagulants Apixaban, dabigatran, edoxaban, rivaroxaban Antiepileptic drugs The effect of phenytoin on phenobarbital, valproic acid and sodium valproate serum levels… (Fachinformation zu Fosphenytoin, Arzneimittelwechselwirkungen)

CYP3A4 Substrates with narrow therapeutic index (e.g., alfentanil, quinidine, cyclosporine) : Glycerol phenylbutyrate may decrease exposure; monitor for decreased efficacy of the narrow therapeutic index drug ( 7.3 ) (Fachinformation zu Glycerolphenylbutyrat, Arzneimittelwechselwirkungen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Effect on QT/QTc Interval: Androgen deprivation therapy may prolong the QT interval. (Fachinformation zu Goserelin, Warnhinweise und Vorsichtsmaßnahmen)

The haloperidol plasma concentrations increased when a CYP3A4 and/or CYP2D6 inhibitor was coadministered with haloperidol. (Fachinformation zu Haloperidol, Arzneimittelwechselwirkungen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Monitor QT interval when administering FORANE to susceptible patients (e.g., patients with congenital Long QT Syndrome or patients taking drugs that can prolong the QT interval). (Fachinformation zu Isofluran, Warnhinweise und Vorsichtsmaßnahmen)

TYKERB may prolong the QT interval in some patients. (Fachinformation zu Lapatinib, Warnhinweise und Vorsichtsmaßnahmen)

Effect on QT/QTc Interval: Androgen deprivation therapy may prolong the QT interval. (Fachinformation zu Leuprorelin, Warnhinweise und Vorsichtsmaßnahmen)

Risk of QT Prolongation : Lofexidine tablets prolong the QT interval. (Fachinformation zu Lofexidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Use with Other N-methyl-D-aspartate (NMDA) Antagonists The combined use of memantine hydrochloride with other NMDA antagonists (amantadine, ketamine, and dextromethorphan) has not been systematically evaluated and such use should be approached with caution. (Fachinformation zu Memantin, Arzneimittelwechselwirkungen)

Use of Memantine with Other N-methyl-D-aspartate (NMDA) Antagonists The combined use of memantine hydrochloride with other NMDA antagonists (amantadine, ketamine, and dextromethorphan) has not been systematically evaluated and such use should be approached with caution. (Fachinformation zu Memantin und Donepezil, Arzneimittelwechselwirkungen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Examples quinidine, bupropion, fluoxetine, and paroxetine Monoamine Oxidase Inhibitors Clinical Impact Increased risk of hypertension [see Warnings and Precautions ( 5.5 )] . (Fachinformation zu Metoclopramid, Arzneimittelwechselwirkungen)

CYP2D6 inhibitors: Increased metoprolol concentration. (Fachinformation zu Metoprolol und Hydrochlorothiazid, Arzneimittelwechselwirkungen)

Drugs that Prolong the QT Interval QT prolongation has been reported, particularly when metronidazole was administered with drugs with the potential for prolonging the QT interval. (Fachinformation zu Metronidazol, Arzneimittelwechselwirkungen)

Serotonergic Drugs The concomitant use of opioids with other drugs that affect the serotonergic neurotransmitter system, such as selective serotonin reuptake inhibitors (SSRIs), serotonin and norepinephrine reuptake inhibitors (SNRIs), tricyclic antidepressants (TCAs), triptans, 5-HT3 receptor antagonists, drugs that effect the serotonin neurotransmitter system… (Fachinformation zu Nalbuphin, Arzneimittelwechselwirkungen)

P-glycoprotein (P-gp) Inhibitors (e.g., amiodarone, captopril, cyclosporine, quercetin, quinidine, verapamil) Clinical Impact Increase in plasma naldemedine concentrations [see Clinical Pharmacology (12.3) ] Intervention Monitor for potential naldemedine-related adverse reactions [see Adverse Reactions (6.1) ] . (Fachinformation zu Naldemedin, Arzneimittelwechselwirkungen)

•Weak CYP3A4 inhibitors (e.g., quinidine, cimetidine) •Clinically significant increases in naloxegol concentrations are not expected. (Fachinformation zu Naloxegol, Arzneimittelwechselwirkungen)

Use with CYP2D6 Inhibitors Nebivolol exposure increases with inhibition of CYP2D6 [see Drug Interactions ( 7 ) ] . (Fachinformation zu Nebivolol, Warnhinweise und Vorsichtsmaßnahmen)

Co-administration of multiple doses of quinidine sulfate, 200 mg t.i.d., and nifedipine, 20 mg t.i.d., increased C max and AUC of nifedipine in healthy volunteers by factors of 2.30 and 1.37, respectively. (Fachinformation zu Nifedipin, Arzneimittelwechselwirkungen)

Quinidine at 648 mg bid decreased the bioavailability (AUC) of nisoldipine by 26%, but not the peak concentration. (Fachinformation zu Nisoldipin, Arzneimittelwechselwirkungen)

Drugs Metabolized by CYP 450 Enzymes: concomitant use with other drugs mainly metabolized by CYP3A4 that have a narrow therapeutic index (e.g., quinidine) should be used with caution and increased monitoring may be required (‎ 7 ). (Fachinformation zu Octreotid, Arzneimittelwechselwirkungen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

…combination with other drugs that are known to prolong QTc including Class 1A (e.g., quinidine, procainamide) or Class III (e.g., amiodarone, sotalol) antiarrhythmic medications, antipsychotic medications (e.g., chlorpromazine, thioridazine), antibiotics (e.g., gatifloxacin, moxifloxacin), or any other class of medications known to prolong the QTc interval. (Fachinformation zu Paliperidon, Warnhinweise und Vorsichtsmaßnahmen)

Drugs that Prolong QT: Use with caution in patients who are at significant risk of developing QTc prolongation. (Fachinformation zu Pasireotid, Arzneimittelwechselwirkungen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

…decreased PT/INR responses have been reported when phenytoin is coadministered with warfarin Other Corticosteroids, doxycycline, estrogens, furosemide, oral contraceptives, paroxetine, quinidine, rifampin, sertraline, theophylline, and vitamin D Drugs whose level is decreased by phenytoin Anticoagulants Apixaban, dabigatran, edoxaban, rivaroxaban Antiepileptic drugs… (Fachinformation zu Phenytoin, Arzneimittelwechselwirkungen)

QT Interval Prolonging Drugs The pharmacodynamic interaction potential to prolong the QT interval of the electrocardiogram between Primaquine phosphate Tablets and other drugs that effect cardiac conduction is unknown. (Fachinformation zu Primaquin, Arzneimittelwechselwirkungen)

Concurrent Other Antiarrhythmic Agents Concurrent use of PA with other Group 1A antiarrhythmic agents such as quinidine or disopyramide may produce enhanced prolongation of conduction or depression of contractility and hypotension, especially in patients with cardiac decompensation. (Fachinformation zu Procainamid, Warnhinweise)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Impact of Other Drugs on Propranolol CYP2D6, CYP1A2 and CYP2C19 Inhibitors: CYP2D6 inhibitors (e.g. bupropion, fluoxetine, paroxetine, quinidine), CYP1A2 inhibitors (e.g., ciprofloxacin, enoxamine, fluvoxamine) and CYP2C19 inhibitors (e.g., fluconazole, fluvoxamine, ticlopidine) increase exposure to propranolol when co-administered with INNOPRAN XL. (Fachinformation zu Propranolol, Arzneimittelwechselwirkungen)

…Class 1A antiarrythmics (e.g., quinidine, procainamide) or Class III antiarrythmics (e.g., amiodarone, sotalol), antipsychotic medications (e.g., ziprasidone, chlorpromazine, thioridazine), antibiotics (e.g., gatifloxacin, moxifloxacin), or any other class of medications known to prolong the QTc interval (e.g., pentamidine, levomethadyl acetate, methadone). (Fachinformation zu Quetiapin, Warnhinweise und Vorsichtsmaßnahmen)

Table 4: Drug Interactions with PRIFTIN: Dosage Adjustment May be Necessary Drug Class Examples of Drugs Within Class Antiarrhythmics Disopyramide, mexiletine, quinidine, tocainide Antibiotics Chloramphenicol, clarithromycin, dapsone, doxycycline; Fluoroquinolones (such as ciprofloxacin) Oral Anticoagulants Warfarin Anticonvulsants Phenytoin Antimalarials Quinine… (Fachinformation zu Rifapentin, Arzneimittelwechselwirkungen)

In healthy subjects, 75 mg once daily and 300 mg once daily (3 times and 12 times the dose in EDURANT) have been shown to prolong the QTc interval of the electrocardiogram. (Fachinformation zu Rilpivirin, Warnhinweise und Vorsichtsmaßnahmen)

P-gp Inhibitors Concomitant administration of NURTEC ODT with potent inhibitors of P-gp (e.g., amiodarone, cyclosporine, lapatinib, quinidine, ranolazine) may result in increased exposure of rimegepant. (Fachinformation zu Rimegepant, Arzneimittelwechselwirkungen)

Fluoxetine and Paroxetine Fluoxetine (20 mg once daily) and paroxetine (20 mg once daily), CYP 2D6 inhibitors, have been shown to increase the plasma concentration of risperidone 2.5–2.8 fold and 3–9 fold respectively. (Fachinformation zu Risperidon, Arzneimittelwechselwirkungen)

Certain inhalation anesthetics, particularly enflurane and isoflurane, antibiotics, magnesium salts, lithium, local anesthetics, procainamide, and quinidine have been shown to increase the duration of neuromuscular block and decrease infusion requirements of neuromuscular blocking agents [see Drug Interactions ( 7.3 )] . (Fachinformation zu Rocuronium, Warnhinweise und Vorsichtsmaßnahmen)

Exposure to dextromethorphan, a CYP2D6 substrate, following a single dose of rolapitant increased about 3-fold on Days 8 and Day 22. (Fachinformation zu Rolapitant, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Caution should be exercised when administering sevoflurane to susceptible patients (e.g., patients with congenital Long QT Syndrome or patients taking drugs that can prolong the QT interval). (Fachinformation zu Sevofluran, Warnhinweise)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Monitor electrolytes and electrocardiograms in patients with congestive heart failure, bradyarrhythmias, drugs known to prolong the QT interval, including Class Ia and III antiarrhythmics. (Fachinformation zu Sorafenib, Warnhinweise und Vorsichtsmaßnahmen)

Drug Interactions Some studies have shown that simultaneous sucralfate administration in healthy volunteers reduced the extent of absorption (bioavailability) of single doses of the following: cimetidine, digoxin, fluoroquinolone antibiotics, ketoconazole, l-thyroxine, phenytoin, quinidine, ranitidine, tetracycline, and theophylline. (Fachinformation zu Sucralfat, Arzneimittelwechselwirkungen)

Drugs that Prolong QT Interval SUTENT is associated with QTc interval prolongation [see Warnings and Precautions (5.3) , Clinical Pharmacology (12.2) ] . (Fachinformation zu Sunitinib, Arzneimittelwechselwirkungen)

Drugs that May Enhance the Neuromuscular Blocking Action of Succinylcholine : promazine, oxytocin, aprotinin, certain non-penicillin antibiotics, quinidine, β-adrenergic blockers, procainamide, lidocaine, trimethaphan, lithium carbonate, magnesium salts, quinine, chloroquine, isoflurane, desflurane, metoclopramide, terbutaline, and drugs that reduce plasma cholinesterase… (Fachinformation zu Suxamethonium, Arzneimittelwechselwirkungen)

Use with caution in combination with moderate inhibitors of CYP3A4, with strong or moderate inhibitors of CYP2D6, in patients known to be CYP2D6 poor metabolizers, or in combination with other cytochrome P450 inhibitors. (Fachinformation zu Tamsulosin, Warnhinweise und Vorsichtsmaßnahmen)

In studies in healthy subjects characterized as extensive metabolizers of dextromethorphan (antitussive drug and CYP2D6 probe substrate), terbinafine increases the dextromethorphan/ dextrorphan metabolite ratio in urine by 16- to 97-fold on average. (Fachinformation zu Terbinafin, Arzneimittelwechselwirkungen)

Potentiated systemic beta-blockade (e.g., decreased heart rate) has been reported during combined treatment with quinidine and timolol. (Fachinformation zu Timolol, Arzneimittelwechselwirkungen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Agents generally accepted to prolong QT interval include Class 1A (e.g., quinidine, procainamide, disopyramide) and Class III (e.g., amiodarone, sotalol, ibutilide, dofetilide) antiarrhythmics; certain antipsychotics (e.g., thioridazine, haloperidol); certain antidepressants (e.g., venlafaxine, amitriptyline); certain antibiotics (e.g., erythromycin, clarithromycin,… (Fachinformation zu Toremifen, Arzneimittelwechselwirkungen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Effect on QT/QTc Interval: Androgen deprivation therapy may prolong the QT interval. (Fachinformation zu Triptorelin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Use of BCRP and/or P-gp only inhibitors (e.g., quinidine, carvedilol, eltrombopag, curcumin) may increase the exposure of ubrogepant [ s ee Clinical Pharmacology ( 12.3 ) ] . (Fachinformation zu Ubrogepant, Arzneimittelwechselwirkungen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Anticholinergic effects of quinidine: Monitor for worsening in myasthenia gravis and other sensitive conditions. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

For patients who are CYP2D6 poor metabolizers or are taking a strong CYP2D6 inhibitor, dose reduction may be necessary. (Fachinformation zu Valbenazin, Warnhinweise und Vorsichtsmaßnahmen)

CYP2D6 Substrates Clinical Impact Viloxazine is a weak inhibitor of CYP2D6, and increases the exposure of CYP2D6 substrates when coadministered [see Clinical Pharmacology (12.3) ] . (Fachinformation zu Viloxazin, Arzneimittelwechselwirkungen)

Digoxin Quinidine is an inhibitor of P-glycoprotein. (Fachinformation zu Dextromethorphan und Chinidin, Arzneimittelwechselwirkungen)

CYP2D6 substrates Clinical Impact: In vitro studies indicate that celecoxib, although not a substrate, is an inhibitor of CYP2D6. (Fachinformation zu Celecoxib, Arzneimittelwechselwirkungen)

Drugs which inhibit CYP2D6 and CYP3A3/4 also inhibit the metabolism of cevimeline. (Fachinformation zu Cevimelin, Arzneimittelwechselwirkungen)

The selective serotonin reuptake inhibitors sertraline (weak CYP3A4 inducer) and fluoxetine (CYP2D6 inhibitor), and the anti-epileptic drug felbamate (CYP2C19 inhibitor and CYP3A4 inducer) do not affect the pharmacokinetics of clonazepam. (Fachinformation zu Clonazepam, Arzneimittelwechselwirkungen)

Examples: α-adrenergic antagonists, β-adrenergic receptor antagonists, reserpine, quinidine, mephentermine Other Drug Interactions G u anethidine C linical Impact: Ephedrine may inhibit the neuron blockage produced by guanethidine, resulting in loss of antihypertensive effectiveness. (Fachinformation zu Ephedrin, Arzneimittelwechselwirkungen)

Digoxin Quinidine is an inhibitor of P-glycoprotein. (Fachinformation zu Dextromethorphan und Chinidin, Arzneimittelwechselwirkungen)

Strong and moderate CYP3A inhibitors include, but are not limited to, atazanavir, clarithromycin, indinavir, itraconazole, ketoconazole, nefazodone, nelfinavir, ritonavir, saquinavir, telithromycin, amprenavir, aprepitant, diltiazem, erythromycin, fluconazole, fosamprenavir, grapefruit juice, and verapamil. (Fachinformation zu Dextromethorphan und Chinidin, Warnhinweise und Vorsichtsmaßnahmen)

Digoxin Quinidine is an inhibitor of P-glycoprotein. (Fachinformation zu Dextromethorphan und Chinidin, Arzneimittelwechselwirkungen)

A variety of antiarrhythmics such as quinidine or propranolol were also added, sometimes with improved control of ventricular ectopy. (Fachinformation zu Mexiletin, Arzneimittelwechselwirkungen)

…for Drug Interaction: It appears possible, although there is no supporting experimental evidence, that the high renal clearance of desglymidodrine (a base) is due to active tubular secretion by the base-secreting system also responsible for the secretion of such drugs as metformin, cimetidine, ranitidine, procainamide, triamterene, flecainide, and quinidine. (Fachinformation zu Midodrin, Vorsichtsmaßnahmen)

…untoward clinical manifestations have been observed in limited experience with patients in whom milrinone was used concurrently with the following drugs: digitalis glycosides; lidocaine, quinidine; hydralazine, prazosin; isosorbide dinitrate, nitroglycerin; chlorthalidone, furosemide, hydrochlorothiazide, spironolactone; captopril; heparin, warfarin, diazepam, insulin;… (Fachinformation zu Milrinon, Arzneimittelwechselwirkungen)

Digoxin Quinidine is an inhibitor of P-glycoprotein. (Fachinformation zu Dextromethorphan und Chinidin, Arzneimittelwechselwirkungen)

In Vitro Interaction The plasma protein binding of nicardipine was not altered when therapeutic concentrations of furosemide, propranolol, dipyridamole, warfarin, quinidine, or naproxen were added to human plasma in vitro. (Fachinformation zu Nicardipin, Arzneimittelwechselwirkungen)

Digoxin Quinidine is an inhibitor of P-glycoprotein. (Fachinformation zu Dextromethorphan und Chinidin, Arzneimittelwechselwirkungen)

Serotonergic Drugs Clinical Impact: The concomitant use of opioids with other drugs that affect the serotonergic neurotransmitter system has resulted in serotonin syndrome [see Adverse Reaction ( 6.2)]. (Fachinformation zu Oxycodon und Paracetamol, Arzneimittelwechselwirkungen)

The safety and efficacy of combination therapy with phentermine and any other drug products for weight loss including prescribed drugs, over-the-counter preparations, and herbal products, or serotonergic agents such as selective serotonin reuptake inhibitors (e.g., fluoxetine, sertraline, fluvoxamine, paroxetine), have not been established. (Fachinformation zu Phentermin, Warnhinweise und Vorsichtsmaßnahmen)

…tolazamide, and tolbutamide; (3) tranquilizers and sedatives–chlordiazepoxide, diazepam, and phenobarbital; (4) antigout–allopurinol, colchicine, and probenecid; (5) antiarrhythmics–procainamide, propranolol (see WARNINGS however), and quinidine; and (6) analgesics, antipyretics and anti-inflammatories–propoxyphene, aspirin, indomethacin, and phenylbutazone. (Fachinformation zu Prazosin, Arzneimittelwechselwirkungen)

Digoxin Quinidine is an inhibitor of P-glycoprotein. (Fachinformation zu Dextromethorphan und Chinidin, Arzneimittelwechselwirkungen)

Strong Inhibitors of CYP2D6 The impact on the efficacy of tamoxifen with co-administration of strong CYP2D6 inhibitors (e.g., paroxetine) is not well established. (Fachinformation zu Tamoxifen, Arzneimittelwechselwirkungen)

Other Experience concerning injection of quinidine during recovery from use of other muscle relaxants suggests that recurrent paralysis may occur. (Fachinformation zu Vecuronium, Vorsichtsmaßnahmen)

Digoxin Quinidine is an inhibitor of P-glycoprotein. (Fachinformation zu Dextromethorphan und Chinidin, Arzneimittelwechselwirkungen)

Drugs Metabolized by Cytochrome P450 Isozymes In healthy subjects, a subcutaneous dose of 0.3 mg/kg of RELISTOR did not significantly affect the metabolism of dextromethorphan, a CYP2D6 substrate. (Fachinformation zu Methylnaltrexon, Arzneimittelwechselwirkungen)