Timolol interactions

Timolol (Timoptic, Betimol, Istalol), a beta blocker has 115 documented interactions across the FDA labels and fact sheets we index: 11 major, 97 moderate, 7 minor, and 0 where a label reports no significant interaction. Each entry below quotes the sentence behind it. This drug page is a starting point, not a verdict for your situation.

Major interactions (11)

  • Diltiazemcalcium channel blockerMajor

    • Concomitant administration with IV beta-blockers. (Diltiazem label, Contraindications)

  • FlecainideantiarrhythmicMajor

    Concomitant negative chronotropic therapy such as digoxin or beta-blockers may lower the risk of this complication. (Flecainide label, Boxed warning)

  • Levothyroxinethyroid hormoneMajor

    Patients suspected of developing thyrotoxicosis should be managed carefully to avoid abrupt withdrawal of beta-adrenergic blocking agents that might precipitate a thyroid storm. (Timolol label, Warnings and precautions)

  • Liothyroninethyroid hormoneMajor

    Patients suspected of developing thyrotoxicosis should be managed carefully to avoid abrupt withdrawal of beta-adrenergic blocking agents that might precipitate a thyroid storm. (Timolol label, Warnings and precautions)

  • Methimazoleantithyroid drugMajor

    Patients suspected of developing thyrotoxicosis should be managed carefully to avoid abrupt withdrawal of beta-adrenergic blocking agents that might precipitate a thyroid storm. (Timolol label, Warnings and precautions)

  • MinoxidilvasodilatorMajor

    Minoxidil must be administered under close supervision, usually concomitantly with therapeutic doses of a beta-adrenergic blocking agent to prevent tachycardia and increased myocardial workload. (Minoxidil label, Boxed warning)

  • Nebivololbeta blockerMajor

    Hypotensive Agents Do not use BYSTOLIC with other β-blockers. (Nebivolol label, Drug interactions)

  • Propylthiouracilantithyroid drugMajor

    Patients suspected of developing thyrotoxicosis should be managed carefully to avoid abrupt withdrawal of beta-adrenergic blocking agents that might precipitate a thyroid storm. (Timolol label, Warnings and precautions)

  • RepaglinidemeglitinideMajor

    Examples: beta-blockers, clonidine, guanethidine, and reserpine Clopidogrel : Avoid concomitant use; if used concomitantly initiate at 0.5 mg before each meal and limit total daily dose to 4 mg ( 7 ) (Repaglinide label, Drug interactions)

  • Rivastigminecholinesterase inhibitorMajor

    Concomitant use with metoclopramide, beta-blockers, or cholinomimetic and anticholinergic drugs is not recommended ( 7.1 , 7.2 , 7.3 ) (Rivastigmine label, Drug interactions)

  • TranylcypromineMAO inhibitorMajor

    …Syndrome (SS) c ] Agents with blood pressure-reducing effects Use with caution d Hypotension e Non-selective H1 receptor antagonists Contraindicated a Increased anticholinergic effects Beta-adrenergic blockers (see also agents or procedures with blood pressure-reducing effects) Use with the caution d More pronounced bradycardia, postural hypotension e Blood glucose-lowering… (Tranylcypromine label, Drug interactions)

Moderate interactions (97)

  • AcarboseantidiabeticModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • Albuterolbeta-adrenergic agonistModerate

    Beta-blockers: Use with caution. (Albuterol label, Drug interactions)

  • AmiodaroneantiarrhythmicModerate

    CYP2D6 Inhibitors Potentiated systemic beta-blockade (e.g., decreased heart rate) has been reported during combined treatment with CYP2D6 inhibitors (e.g., quinidine) and timolol. (Timolol label, Drug interactions)

  • Amlodipinedihydropyridine calcium channel blockerModerate

    Oral or intravenous calcium antagonists may cause atrioventricular conduction disturbances, left ventricular failure, and hypotension. (Timolol label, Drug interactions)

  • Amlodipine and benazeprildihydropyridine calcium channel blockerModerate

    Oral or intravenous calcium antagonists may cause atrioventricular conduction disturbances, left ventricular failure, and hypotension. (Timolol label, Drug interactions)

  • Aspirin and dipyridamoleantiplatelet agentModerate

    Beta Blockers The hypotensive effects of beta blockers may be diminished by the concomitant administration of aspirin due to inhibition of renal prostaglandins, leading to decreased renal blood flow and salt and fluid retention. (Aspirin and dipyridamole label, Drug interactions)

  • Budesonide and formoterolcorticosteroidModerate

    Beta-blockers: Use with caution. (Budesonide and formoterol label, Drug interactions)

  • BupropionantidepressantModerate

    CYP2D6 Inhibitors Potentiated systemic beta-blockade (e.g., decreased heart rate) has been reported during combined treatment with CYP2D6 inhibitors (e.g., quinidine) and timolol. (Timolol label, Drug interactions)

  • CanagliflozinSGLT2 inhibitorModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • Carvedilolbeta blockerModerate

    As with other β-blockers, if COREG is administered with calcium channel blockers of the verapamil or diltiazem type, it is recommended that ECG and blood pressure be monitored. (Carvedilol label, Drug interactions)

  • CelecoxibNSAIDModerate

    Intervention: • During concomitant use of VYSCOXA and ACE inhibitors, ARBs, or beta-blockers, monitor blood pressure to ensure that the desired blood pressure is obtained. (Celecoxib label, Drug interactions)

  • Cevimelinecholinergic agonistModerate

    DRUG INTERACTIONS Cevimeline should be administered with caution to patients taking beta adrenergic antagonists, because of the possibility of conduction disturbances. (Cevimeline label, Drug interactions)

  • CimetidineH2 blockerModerate

    CYP2D6 Inhibitors Potentiated systemic beta-blockade (e.g., decreased heart rate) has been reported during combined treatment with CYP2D6 inhibitors (e.g., quinidine) and timolol. (Timolol label, Drug interactions)

  • ClobazambenzodiazepineModerate

    CYP2D6 Inhibitors Potentiated systemic beta-blockade (e.g., decreased heart rate) has been reported during combined treatment with CYP2D6 inhibitors (e.g., quinidine) and timolol. (Timolol label, Drug interactions)

  • Clonidinealpha-adrenergic agonistModerate

    Abrupt discontinuation of QLONILIK can cause rebound hypertension with elevated plasma catecholamines, especially with higher doses or concomitant beta-blocker use. (Clonidine label, Warnings and precautions)

  • DapagliflozinSGLT2 inhibitorModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • DarifenacinanticholinergicModerate

    CYP2D6 Inhibitors Potentiated systemic beta-blockade (e.g., decreased heart rate) has been reported during combined treatment with CYP2D6 inhibitors (e.g., quinidine) and timolol. (Timolol label, Drug interactions)

  • DeutetrabenazineVMAT2 inhibitorModerate

    Catecholamine-Depleting Drugs Close observation of the patient is recommended when a beta-blocker is administered to patients receiving catecholamine-depleting drugs such as reserpine, because of possible additive effects and the production of hypotension and/or marked bradycardia, which may result in vertigo, syncope, or postural hypotension. (Timolol label, Drug interactions)

  • DiclofenacNSAIDModerate

    Intervention: During concomitant use of Diclofenac Potassium and ACE-inhibitors, ARBs, or beta-blockers, monitor blood pressure to ensure that the desired blood pressure is obtained. (Diclofenac label, Drug interactions)

  • Digoxindigitalis glycosideModerate

    Digitalis and calcium antagonists may have additive effects in prolonging atrioventricular conduction time. (Timolol label, Drug interactions)

  • Dihydroergotamineergot alkaloidModerate

    Beta Blockers Although the results of a clinical study did not indicate a safety problem associated with the administration of Dihydroergotamine Mesylate Injection, USP to subjects already receiving propranolol, there have been reports that propranolol may potentiate the vasoconstrictive action of ergotamine by blocking the vasodilating property of epinephrine. (Dihydroergotamine label, Drug interactions)

  • DiphenhydramineantihistamineModerate

    CYP2D6 Inhibitors Potentiated systemic beta-blockade (e.g., decreased heart rate) has been reported during combined treatment with CYP2D6 inhibitors (e.g., quinidine) and timolol. (Timolol label, Drug interactions)

  • DofetilideantiarrhythmicModerate

    Concomitant medications were grouped as ACE inhibitors, oral anticoagulants, calcium channel blockers, beta blockers, cardiac glycosides, inducers of CYP3A4, substrates and inhibitors of CYP3A4, substrates and inhibitors of P-glycoprotein, nitrates, sulphonylureas, loop diuretics, potassium sparing diuretics, thiazide diuretics, substrates and inhibitors of tubular… (Dofetilide label, Drug interactions)

  • DronedaroneantiarrhythmicModerate

    Give a low dose of beta-blockers initially, and increase only after ECG verification of good tolerability [see Drug Interactions (7.3) , Clinical Pharmacology (12.3) ] . (Dronedarone label, Drug interactions)

  • DroxidopasympathomimeticModerate

    If necessary during surgery, the effects of beta-adrenergic blocking agents may be reversed by sufficient doses of adrenergic agonists. (Timolol label, Warnings and precautions)

  • DulaglutideGLP-1 receptor agonistModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • DuloxetineSNRIModerate

    CYP2D6 Inhibitors Potentiated systemic beta-blockade (e.g., decreased heart rate) has been reported during combined treatment with CYP2D6 inhibitors (e.g., quinidine) and timolol. (Timolol label, Drug interactions)

  • EmpagliflozinSGLT2 inhibitorModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • Empagliflozin and metforminSGLT2 inhibitorModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • EpinephrinesympathomimeticModerate

    Such patients may be unresponsive to the usual doses of epinephrine used to treat anaphylactic reactions. (Timolol label, Warnings and precautions)

  • EverolimusimmunosuppressantModerate

    CYP2D6 Inhibitors Potentiated systemic beta-blockade (e.g., decreased heart rate) has been reported during combined treatment with CYP2D6 inhibitors (e.g., quinidine) and timolol. (Timolol label, Drug interactions)

  • ExenatideGLP-1 receptor agonistModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • Felodipinedihydropyridine calcium channel blockerModerate

    Oral or intravenous calcium antagonists may cause atrioventricular conduction disturbances, left ventricular failure, and hypotension. (Timolol label, Drug interactions)

  • FluoxetineSSRIModerate

    CYP2D6 Inhibitors Potentiated systemic beta-blockade (e.g., decreased heart rate) has been reported during combined treatment with CYP2D6 inhibitors (e.g., quinidine) and timolol. (Timolol label, Drug interactions)

  • FluvoxamineSSRIModerate

    Propranolol and Other Beta-Blockers: Coadministration of fluvoxamine maleate 100 mg per day and propranolol 160 mg per day in normal volunteers resulted in a mean five-fold increase (range 2 to 17) in minimum propranolol plasma concentrations. (Fluvoxamine label, Drug interactions)

  • Formoterolbeta-adrenergic agonistModerate

    Beta-blockers may decrease effectiveness. (Formoterol label, Drug interactions)

  • GlimepiridesulfonylureaModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • GlipizidesulfonylureaModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • GlucagonModerate

    Table 4: Clinically Significant Drug Interaction with GVOKE and GVOKE VialDx Beta-Blockers Clincial Impact: Patients taking beta-blockers may have a transient increase in pulse and blood pressure when given GVOKE or GVOKE VialDx. (Glucagon label, Drug interactions)

  • GlyburidesulfonylureaModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • Glyburide and metforminsulfonylureaModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • IbuprofenNSAIDModerate

    Intervention: During concomitant use of CALDOLOR and ACE-inhibitors, ARBs, or beta- blockers, monitor blood pressure to ensure that the desired blood pressure is obtained. (Ibuprofen label, Drug interactions)

  • ImatinibCYP3A4 inhibitorModerate

    CYP2D6 Inhibitors Potentiated systemic beta-blockade (e.g., decreased heart rate) has been reported during combined treatment with CYP2D6 inhibitors (e.g., quinidine) and timolol. (Timolol label, Drug interactions)

  • IndomethacinNSAIDModerate

    Intervention: During concomitant use of INDOCIN and ACE-inhibitors, ARBs, or beta-blockers, monitor blood pressure to ensure that the desired blood pressure is obtained. (Indomethacin label, Drug interactions)

  • Insulin aspartinsulinModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • Insulin degludecinsulinModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • Insulin detemirinsulinModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • Insulin glargineinsulinModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • Insulin lisproinsulinModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • Insulin regular (human)insulinModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • Isradipinedihydropyridine calcium channel blockerModerate

    Oral or intravenous calcium antagonists may cause atrioventricular conduction disturbances, left ventricular failure, and hypotension. (Timolol label, Drug interactions)

  • Itraconazoleazole antifungalModerate

    Beta Blockers Nadolol Monitor for adverse reactions. (Itraconazole label, Drug interactions)

  • IvabradineModerate

    The risk of bradycardia increases with concomitant administration of drugs that slow heart rate (e.g., digoxin, amiodarone, beta-blockers). (Ivabradine label, Drug interactions)

  • Ketoconazoleazole antifungalModerate

    Antivirals indinavir, maraviroc, saquinavir Beta Blockers nadolol Calcium Channel Blockers felodipine, nisoldipine other dihydropyridines, verapamil Calcium channel blockers can have a negative inotropic effect which may be additive to those of ketoconazole. (Ketoconazole label, Drug interactions)

  • LacosamideanticonvulsantModerate

    VIMPAT should also be used with caution in patients on concomitant medications that affect cardiac conduction, including sodium channel blockers, beta-blockers, calcium channel blockers, potassium channel blockers, and medications that prolong the PR interval [see Drug Interactions (7.2) ] . (Lacosamide label, Warnings and precautions)

  • Levalbuterolbeta-adrenergic agonistModerate

    In this setting, cardioselective beta-blockers should be considered, although they should be administered with caution. (Levalbuterol label, Drug interactions)

  • LinagliptinDPP-4 inhibitorModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • LiraglutideGLP-1 receptor agonistModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • MeloxicamNSAIDModerate

    Intervention: During concomitant use of QAMZOVA and ACE-inhibitors, ARBs, or beta-blockers, monitor blood pressure to ensure that the desired blood pressure is obtained. (Meloxicam label, Drug interactions)

  • MetforminbiguanideModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • Midodrinealpha-adrenergic agonistModerate

    If necessary during surgery, the effects of beta-adrenergic blocking agents may be reversed by sufficient doses of adrenergic agonists. (Timolol label, Warnings and precautions)

  • Mirabegronbeta-adrenergic agonistModerate

    If necessary during surgery, the effects of beta-adrenergic blocking agents may be reversed by sufficient doses of adrenergic agonists. (Timolol label, Warnings and precautions)

  • ModafinilCNS stimulantModerate

    If necessary during surgery, the effects of beta-adrenergic blocking agents may be reversed by sufficient doses of adrenergic agonists. (Timolol label, Warnings and precautions)

  • Naltrexone and bupropionopioid antagonistModerate

    CYP2D6 Inhibitors Potentiated systemic beta-blockade (e.g., decreased heart rate) has been reported during combined treatment with CYP2D6 inhibitors (e.g., quinidine) and timolol. (Timolol label, Drug interactions)

  • NaproxenNSAIDModerate

    Intervention: During concomitant use of Naproxen Suspension and ACE-inhibitors, ARBs, or beta-blockers, monitor blood pressure to ensure that the desired blood pressure is obtained. (Naproxen label, Drug interactions)

  • Nicardipinedihydropyridine calcium channel blockerModerate

    Oral or intravenous calcium antagonists may cause atrioventricular conduction disturbances, left ventricular failure, and hypotension. (Timolol label, Drug interactions)

  • Nifedipinedihydropyridine calcium channel blockerModerate

    Oral or intravenous calcium antagonists may cause atrioventricular conduction disturbances, left ventricular failure, and hypotension. (Timolol label, Drug interactions)

  • Nisoldipinedihydropyridine calcium channel blockerModerate

    Oral or intravenous calcium antagonists may cause atrioventricular conduction disturbances, left ventricular failure, and hypotension. (Timolol label, Drug interactions)

  • NitroglycerinnitrateModerate

    Antihypertensives Patients receiving antihypertensive drugs, beta-adrenergic blockers, and nitrates should be observed for possible additive hypotensive effects. (Nitroglycerin label, Drug interactions)

  • ParoxetineSSRIModerate

    CYP2D6 Inhibitors Potentiated systemic beta-blockade (e.g., decreased heart rate) has been reported during combined treatment with CYP2D6 inhibitors (e.g., quinidine) and timolol. (Timolol label, Drug interactions)

  • PhenelzineMAO inhibitorModerate

    …hydrochloride desipramine hydrochloride imipramine hydrochloride doxepin carbamazepine cyclobenzaprine HCl amoxapine maprotiline HCl trimipramine maleate protriptyline HCl mirtazapine Phenelzine sulfate should be used with caution in combination with antihypertensive drugs, including thiazide diuretics and β-blockers, since exaggerated hypotensive effects may result. (Phenelzine label, Warnings)

  • PhentermineCNS stimulantModerate

    If necessary during surgery, the effects of beta-adrenergic blocking agents may be reversed by sufficient doses of adrenergic agonists. (Timolol label, Warnings and precautions)

  • PhenylephrinedecongestantModerate

    If necessary during surgery, the effects of beta-adrenergic blocking agents may be reversed by sufficient doses of adrenergic agonists. (Timolol label, Warnings and precautions)

  • Pilocarpinecholinergic agonistModerate

    Drug Interactions Pilocarpine should be administered with caution to patients taking beta-adrenergic antagonists because of the possibility of conduction disturbances. (Pilocarpine label, Drug interactions)

  • PioglitazonethiazolidinedioneModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • Pioglitazone and metforminthiazolidinedioneModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • Prazosinalpha blockerModerate

    Hypotension may develop in patients given prazosin hydrochloride capsules who are also receiving a beta-blocker such as propranolol. (Prazosin label, Warnings)

  • PropafenoneantiarrhythmicModerate

    CYP2D6 Inhibitors Potentiated systemic beta-blockade (e.g., decreased heart rate) has been reported during combined treatment with CYP2D6 inhibitors (e.g., quinidine) and timolol. (Timolol label, Drug interactions)

  • PseudoephedrinedecongestantModerate

    If necessary during surgery, the effects of beta-adrenergic blocking agents may be reversed by sufficient doses of adrenergic agonists. (Timolol label, Warnings and precautions)

  • Pyridostigminecholinesterase inhibitorModerate

    Use with caution in persons with increased risk of anticholinergic reactions, such as persons with bronchial asthma, chronic obstructive pulmonary disease, bradycardia, cardiac arrhythmias, beta blocker treatment (increased risk of anticholinergic reactions). (Pyridostigmine label, Warnings and precautions)

  • RanolazineQT-prolonging drugModerate

    CYP2D6 Inhibitors Potentiated systemic beta-blockade (e.g., decreased heart rate) has been reported during combined treatment with CYP2D6 inhibitors (e.g., quinidine) and timolol. (Timolol label, Drug interactions)

  • RifampinantibioticModerate

    Decrease exposure Beta-blockers Metoprolol Decrease exposure Propranolol Decrease exposure Benzodiazepines Diazepam , Administered with rifampin 1200 mg daily Decrease exposure Benzodiazepine-related drugs Zopiclone Decrease AUC by 82% Zolpidem Decrease AUC by 73% Calcium Channel Blockers Diltiazem Decrease exposure Nifedipine Rifampin 1200 mg administered as… (Rifampin label, Drug interactions)

  • RitonavirantiretroviralModerate

    CYP2D6 Inhibitors Potentiated systemic beta-blockade (e.g., decreased heart rate) has been reported during combined treatment with CYP2D6 inhibitors (e.g., quinidine) and timolol. (Timolol label, Drug interactions)

  • Salmeterolbeta-adrenergic agonistModerate

    Beta-blockers: Use with caution. (Salmeterol label, Drug interactions)

  • SemaglutideGLP-1 receptor agonistModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • SitagliptinDPP-4 inhibitorModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • Sitagliptin and metforminDPP-4 inhibitorModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • Sofosbuvir and velpatasvirantiviralModerate

    Patients also taking beta blockers, or those with underlying cardiac comorbidities and/or advanced liver disease may be at increased risk for symptomatic bradycardia with coadministration of amiodarone. (Sofosbuvir and velpatasvir label, Warnings and precautions)

  • Sumatriptan and naproxentriptanModerate

    Intervention: During concomitant use of sumatriptan and naproxen sodium tablets and ACE-inhibitors, ARBs, or beta-blockers, monitor blood pressure to ensure that the desired blood pressure is obtained [see Warnings and Precautions (5.8)] . (Sumatriptan and naproxen label, Drug interactions)

  • TerbinafineantifungalModerate

    CYP2D6 Inhibitors Potentiated systemic beta-blockade (e.g., decreased heart rate) has been reported during combined treatment with CYP2D6 inhibitors (e.g., quinidine) and timolol. (Timolol label, Drug interactions)

  • Terbutalinebeta-adrenergic agonistModerate

    In this setting, cardioselective beta-blockers could be considered, although they should be administered with caution. (Terbutaline label, Precautions)

  • TetrabenazineVMAT2 inhibitorModerate

    Catecholamine-Depleting Drugs Close observation of the patient is recommended when a beta-blocker is administered to patients receiving catecholamine-depleting drugs such as reserpine, because of possible additive effects and the production of hypotension and/or marked bradycardia, which may result in vertigo, syncope, or postural hypotension. (Timolol label, Drug interactions)

  • TirzepatideGLP-1 receptor agonistModerate

    Masking of Hypoglycemic Symptoms in Patients with Diabetes Mellitus Beta-adrenergic blocking agents should be administered with caution in patients subject to spontaneous hypoglycemia or to diabetic patients (especially those with labile diabetes) who are receiving insulin or oral hypoglycemic agents. (Timolol label, Warnings and precautions)

  • Umeclidinium and vilanterolanticholinergicModerate

    Beta-blockers: Use with caution. (Umeclidinium and vilanterol label, Drug interactions)

  • ValbenazineVMAT2 inhibitorModerate

    Catecholamine-Depleting Drugs Close observation of the patient is recommended when a beta-blocker is administered to patients receiving catecholamine-depleting drugs such as reserpine, because of possible additive effects and the production of hypotension and/or marked bradycardia, which may result in vertigo, syncope, or postural hypotension. (Timolol label, Drug interactions)

  • Verapamilcalcium channel blockerModerate

    Oral or intravenous calcium antagonists may cause atrioventricular conduction disturbances, left ventricular failure, and hypotension. (Timolol label, Drug interactions)

  • Vibegronbeta-adrenergic agonistModerate

    If necessary during surgery, the effects of beta-adrenergic blocking agents may be reversed by sufficient doses of adrenergic agonists. (Timolol label, Warnings and precautions)

Minor mentions (7)

  • Atenololbeta blockerMinor

    As with other beta-blockers, when discontinuation of TENORMIN is planned, the patients should be carefully observed and advised to limit physical activity to a minimum. (Atenolol label, Warnings)

  • Bisoprololbeta blockerMinor

    Drug Interactions BISOPROLOL FUMARATE should not be combined with other beta-blocking agents. (Bisoprolol label, Drug interactions)

  • Bisoprolol and hydrochlorothiazidebeta blockerMinor

    Bisoprolol fumarate and hydrochlorothiazide tablets should not be combined with other beta-blocking agents. (Bisoprolol and hydrochlorothiazide label, Drug interactions)

  • CarbamazepineanticonvulsantMinor

    CNS depressants include: alcohol, opioid analgesics, benzodiazepines, tricyclic antidepressants, sedative/hypnotics, anticonvulsants, antipsychotics, antihistamines, anticholinergics, alpha and beta blockers, general anesthetics, muscle relaxants, and illicit CNS depressants. (Carbamazepine label, Drug interactions)

  • Finasteride5-alpha reductase inhibitorMinor

    …PROSCAR was concomitantly used in clinical studies with acetaminophen, acetylsalicylic acid, α-blockers, angiotensin-converting enzyme (ACE) inhibitors, analgesics, anti-convulsants, beta-adrenergic blocking agents, diuretics, calcium channel blockers, cardiac nitrates, HMG-CoA reductase inhibitors, nonsteroidal anti-inflammatory drugs (NSAIDs), benzodiazepines,… (Finasteride label, Drug interactions)

  • FingolimodimmunosuppressantMinor

    Drugs That Slow Heart Rate or Atrioventricular Conduction (e.g., beta blockers or diltiazem) Experience with GILENYA in patients receiving concurrent therapy with drugs that slow the heart rate or AV conduction (e.g., beta blockers, digoxin, or heart rate-slowing calcium channel blockers, such as diltiazem or verapamil) is limited. (Fingolimod label, Drug interactions)

  • PentoxifyllinemethylxanthineMinor

    Pentoxifylline extended-release tablets have been used concurrently with antihypertensive drugs, beta blockers, digitalis, diuretics, and antiarrhythmics, without observed problems. (Pentoxifylline label, Drug interactions)

Check Timolol against everything you take. Add your full list; every pair is checked at once.

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Not medical advice. Severity reflects the label's wording, not your circumstances. A "major" flag can be routine under supervision and a "minor" one can matter at high doses. Ask a pharmacist.