Carbidopa and levodopa interactions

Carbidopa and levodopa (Sinemet, Rytary, Duopa), a dopaminergic drug has 143 documented interactions across the FDA labels and fact sheets we index: 9 major, 133 moderate, 1 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.

What Carbidopa and levodopa looks like

All 77 versions
Carbidopa and levodopa 18.75 mg / 75 mg / 200 mg tablet: brown, oval, 14 mm, imprinted CJ.
CJ
18.75 mg / 75 mg / 200 mg · brown · oval · 14 mm
Alembic
Carbidopa and levodopa 25 mg / 100 mg / 200 mg tablet: brown, oval, 16 mm, imprinted JJ.
JJ
25 mg / 100 mg / 200 mg · brown · oval · 16 mm
Alembic
Carbidopa and levodopa 12.5 mg / 50 mg / 200 mg tablet: brown, round, 11 mm, imprinted L528.
L528
12.5 mg / 50 mg / 200 mg · brown · round · 11 mm
Alembic
Carbidopa and levodopa 50 mg / 200 mg / 200 mg tablet: brown, oval, 17 mm, imprinted L533.
L533
50 mg / 200 mg / 200 mg · brown · oval · 17 mm
Alembic

Renderings from the FDA labels' product listings: color, shape, size, and imprint. 77 documented versions from 23 labelers.

Interactions from the label

Major interactions (9)

  • Nonselective monoamine oxidase (MAO) inhibitors are contraindicated for use with levodopa or carbidopa-levodopa combination products with or without carbidopa. (Carbidopa label, Contraindications)

  • IsoniazidantibioticMajor

    DUOPA is contraindicated in patients who are currently taking a nonselective monoamine oxidase (MAO) inhibitor (e.g., phenelzine and tranylcypromine) or have recently (within 2 weeks) taken a nonselective MAO inhibitor. (Carbidopa and levodopa label, Contraindications)

  • LinezolidantibioticMajor

    DUOPA is contraindicated in patients who are currently taking a nonselective monoamine oxidase (MAO) inhibitor (e.g., phenelzine and tranylcypromine) or have recently (within 2 weeks) taken a nonselective MAO inhibitor. (Carbidopa and levodopa label, Contraindications)

  • Methylene blueMAO inhibitorMajor

    DUOPA is contraindicated in patients who are currently taking a nonselective monoamine oxidase (MAO) inhibitor (e.g., phenelzine and tranylcypromine) or have recently (within 2 weeks) taken a nonselective MAO inhibitor. (Carbidopa and levodopa label, Contraindications)

  • PhenelzineMAO inhibitorMajor

    DUOPA is contraindicated in patients who are currently taking a nonselective monoamine oxidase (MAO) inhibitor (e.g., phenelzine and tranylcypromine) or have recently (within 2 weeks) taken a nonselective MAO inhibitor. (Carbidopa and levodopa label, Contraindications)

  • RasagilineMAO inhibitorMajor

    DUOPA is contraindicated in patients who are currently taking a nonselective monoamine oxidase (MAO) inhibitor (e.g., phenelzine and tranylcypromine) or have recently (within 2 weeks) taken a nonselective MAO inhibitor. (Carbidopa and levodopa label, Contraindications)

  • SelegilineMAO inhibitorMajor

    DUOPA is contraindicated in patients who are currently taking a nonselective monoamine oxidase (MAO) inhibitor (e.g., phenelzine and tranylcypromine) or have recently (within 2 weeks) taken a nonselective MAO inhibitor. (Carbidopa and levodopa label, Contraindications)

  • WARNING Because of the risk of potentially fatal, acute fulminant liver failure, Tolcapone tablets should ordinarily be used in patients with Parkinson's disease on l-dopa/carbidopa who are experiencing symptom fluctuations and are not responding satisfactorily to or are not appropriate candidates for other adjunctive therapies (see INDICATIONS and DOSAGE AND… (Tolcapone label, Boxed warning)

  • TranylcypromineMAO inhibitorMajor

    DUOPA is contraindicated in patients who are currently taking a nonselective monoamine oxidase (MAO) inhibitor (e.g., phenelzine and tranylcypromine) or have recently (within 2 weeks) taken a nonselective MAO inhibitor. (Carbidopa and levodopa label, Contraindications)

Moderate interactions (133)

  • Acebutololbeta blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • AliskirenantihypertensiveModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Amiloridepotassium-sparing diureticModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Amlodipinedihydropyridine calcium channel blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Amlodipine and atorvastatindihydropyridine calcium channel blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Amlodipine and benazeprildihydropyridine calcium channel blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Amlodipine and olmesartandihydropyridine calcium channel blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Amlodipine and valsartandihydropyridine calcium channel blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • AripiprazoleantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • AsenapineantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • Atenololbeta blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Atenolol and chlorthalidonebeta blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Azilsartanangiotensin II receptor blocker (ARB)Moderate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • BenazeprilACE inhibitorModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Betaxololbeta blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Bisoprololbeta blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • BrexpiprazoleantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • Bromocriptinedopamine agonistModerate

    …may experience intense urges to gamble, increased sexual urges, intense urges to spend money, binge or compulsive eating, and/or other intense urges, and the inability to control these urges while taking one or more of the medications, including DUOPA, that increase central dopaminergic tone and that are generally used for the treatment of Parkinson’s disease. (Carbidopa and levodopa label, Warnings and precautions)

  • BupropionantidepressantModerate

    CNS toxicity has been reported when bupropion was coadministered with levodopa or amantadine. (Bupropion label, Drug interactions)

  • Cabergolinedopamine agonistModerate

    …may experience intense urges to gamble, increased sexual urges, intense urges to spend money, binge or compulsive eating, and/or other intense urges, and the inability to control these urges while taking one or more of the medications, including DUOPA, that increase central dopaminergic tone and that are generally used for the treatment of Parkinson’s disease. (Carbidopa and levodopa label, Warnings and precautions)

  • Candesartanangiotensin II receptor blocker (ARB)Moderate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Candesartan and hydrochlorothiazideangiotensin II receptor blocker (ARB)Moderate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • CaptoprilACE inhibitorModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • CariprazineantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • Carvedilolbeta blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Chlorothiazidethiazide diureticModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • ChlorpromazineantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • Chlorthalidonethiazide diureticModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Clonidinealpha-adrenergic agonistModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • ClozapineantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • Deferasiroxiron supplementModerate

    Dopamine D2 receptor antagonists, isoniazid, iron salts, and high-protein diet may reduce the effectiveness of DUOPA ( 7.3 , 7.4 , 7.5 ) (Carbidopa and levodopa label, Drug interactions)

  • Deferiproneiron supplementModerate

    Dopamine D2 receptor antagonists, isoniazid, iron salts, and high-protein diet may reduce the effectiveness of DUOPA ( 7.3 , 7.4 , 7.5 ) (Carbidopa and levodopa label, Drug interactions)

  • DeutetrabenazineVMAT2 inhibitorModerate

    Neuroleptic Malignant Syndrome (NMS) A potentially fatal symptom complex sometimes referred to as Neuroleptic Malignant Syndrome (NMS) has been reported in association with drugs that reduce dopaminergic transmission. (Deutetrabenazine label, Warnings and precautions)

  • Diltiazemcalcium channel blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Doxazosinalpha blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • DroxidopasympathomimeticModerate

    Observe patients carefully when the dosage of NORTHERA is changed or when concomitant levodopa is reduced abruptly or discontinued, especially if the patient is receiving neuroleptics. (Droxidopa label, Warnings and precautions)

  • EnalaprilACE inhibitorModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • EnalaprilatACE inhibitorModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • EntacaponeModerate

    …Metabolized By Catechol-O-Methyltransferase (COMT) When a single 400 mg dose of entacapone was given with intravenous isoprenaline (isoproterenol) and epinephrine without coadministered levodopa and dopa decarboxylase inhibitor, the overall mean maximal changes in heart rate during infusion were about 50% and 80% higher than with placebo, for isoprenaline and epinephrine,… (Entacapone label, Warnings)

  • Eplerenonealdosterone antagonistModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Ethacrynic acidloop diureticModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Felodipinedihydropyridine calcium channel blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Ferric citratephosphate binderModerate

    Dopamine D2 receptor antagonists, isoniazid, iron salts, and high-protein diet may reduce the effectiveness of DUOPA ( 7.3 , 7.4 , 7.5 ) (Carbidopa and levodopa label, Drug interactions)

  • FluphenazineantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • FosinoprilACE inhibitorModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Furosemideloop diureticModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Guanfacinealpha-adrenergic agonistModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • HaloperidolantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • HydralazinevasodilatorModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Hydrochlorothiazidethiazide diureticModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • IloperidoneantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • Indapamidethiazide diureticModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Irbesartanangiotensin II receptor blocker (ARB)Moderate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Irbesartan and hydrochlorothiazideangiotensin II receptor blocker (ARB)Moderate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • IronVitamin and mineralModerate

    Dopamine D2 receptor antagonists, isoniazid, iron salts, and high-protein diet may reduce the effectiveness of DUOPA ( 7.3 , 7.4 , 7.5 ) (Carbidopa and levodopa label, Drug interactions)

  • Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Isradipinedihydropyridine calcium channel blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Labetalolbeta blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • LisinoprilACE inhibitorModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Lofexidinealpha-adrenergic agonistModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Losartanangiotensin II receptor blocker (ARB)Moderate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Losartan and hydrochlorothiazideangiotensin II receptor blocker (ARB)Moderate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • LoxapineantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • LumateperoneantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • LurasidoneantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • MecamylamineantihypertensiveModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • MethyldopaantihypertensiveModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Metoclopramidedopamine antagonistModerate

    Dopamine D2 Receptor Antagonists and Isoniazid Dopamine D2 receptor antagonists (e.g., phenothiazines, butyrophenones, risperidone, metoclopramide, papaverine) and isoniazid may reduce the effectiveness of levodopa. (Carbidopa and levodopa label, Drug interactions)

  • Metolazonethiazide diureticModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Metoprololbeta blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • MinoxidilvasodilatorModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • MoexiprilACE inhibitorModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Nadololbeta blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Naltrexone and bupropionopioid antagonistModerate

    CNS toxicity has been reported when bupropion was coadministered with levodopa or amantadine. (Naltrexone and bupropion label, Drug interactions)

  • Nebivololbeta blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Nicardipinedihydropyridine calcium channel blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Nifedipinedihydropyridine calcium channel blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Nisoldipinedihydropyridine calcium channel blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • NitroprussidevasodilatorModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • OlanzapineantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • Olanzapine and fluoxetineantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • Olmesartanangiotensin II receptor blocker (ARB)Moderate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Olmesartan and hydrochlorothiazideangiotensin II receptor blocker (ARB)Moderate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Olmesartan, amlodipine, and hydrochlorothiazideangiotensin II receptor blocker (ARB)Moderate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • PaliperidoneantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • PapaverinevasodilatorModerate

    Dopamine D2 Receptor Antagonists and Isoniazid Dopamine D2 receptor antagonists (e.g., phenothiazines, butyrophenones, risperidone, metoclopramide, papaverine) and isoniazid may reduce the effectiveness of levodopa. (Carbidopa and levodopa label, Drug interactions)

  • PerindoprilACE inhibitorModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • PerphenazineantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • Phenoxybenzaminealpha blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • PimavanserinantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • PimozideantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • Pindololbeta blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Pramipexoledopamine agonistModerate

    …may experience intense urges to gamble, increased sexual urges, intense urges to spend money, binge or compulsive eating, and/or other intense urges, and the inability to control these urges while taking one or more of the medications, including DUOPA, that increase central dopaminergic tone and that are generally used for the treatment of Parkinson’s disease. (Carbidopa and levodopa label, Warnings and precautions)

  • Prazosinalpha blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • ProchlorperazineantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • Propranololbeta blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • QuetiapineantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • QuinaprilACE inhibitorModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • RamiprilACE inhibitorModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • RisperidoneantipsychoticModerate

    Dopamine D2 Receptor Antagonists and Isoniazid Dopamine D2 receptor antagonists (e.g., phenothiazines, butyrophenones, risperidone, metoclopramide, papaverine) and isoniazid may reduce the effectiveness of levodopa. (Carbidopa and levodopa label, Drug interactions)

  • Ropiniroledopamine agonistModerate

    …may experience intense urges to gamble, increased sexual urges, intense urges to spend money, binge or compulsive eating, and/or other intense urges, and the inability to control these urges while taking one or more of the medications, including DUOPA, that increase central dopaminergic tone and that are generally used for the treatment of Parkinson’s disease. (Carbidopa and levodopa label, Warnings and precautions)

  • Sacubitril and valsartanangiotensin II receptor blocker (ARB)Moderate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • SapropterinModerate

    Interaction with Levodopa : Seizures, over-stimulation or irritability may occur; monitor patients for a change in neurologic status. (Sapropterin label, Warnings and precautions)

  • SepiapterinModerate

    Interaction with Levodopa : Seizures, over-stimulation or irritability may occur; monitor patients for a change in neurologic status. (Sepiapterin label, Warnings and precautions)

  • SolriamfetolCNS stimulantModerate

    Drugs that Increase Blood Pressure and/or Heart Rate and Dopaminergic Drugs : Use caution when co-administering with SUNOSI. (Solriamfetol label, Drug interactions)

  • Spironolactonealdosterone antagonistModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Spironolactone and hydrochlorothiazidealdosterone antagonistModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Telmisartanangiotensin II receptor blocker (ARB)Moderate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Telmisartan and amlodipineangiotensin II receptor blocker (ARB)Moderate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Telmisartan and hydrochlorothiazideangiotensin II receptor blocker (ARB)Moderate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Terazosinalpha blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • TetrabenazineVMAT2 inhibitorModerate

    Neuroleptic Malignant Syndrome (NMS) A potentially fatal symptom complex sometimes referred to as Neuroleptic Malignant Syndrome (NMS) has been reported in association with tetrabenazine tablets and other drugs that reduce dopaminergic transmission [see Drug Interactions (7.6) ]. (Tetrabenazine label, Warnings and precautions)

  • ThioridazineantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • ThiothixeneantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • Tizanidinemuscle relaxantModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Torsemideloop diureticModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • TrandolaprilACE inhibitorModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Triamterenepotassium-sparing diureticModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Triamterene and hydrochlorothiazidepotassium-sparing diureticModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • TrifluoperazineantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

  • TrihexyphenidylanticholinergicModerate

    The usual dose of either trihexyphenidyl or levodopa may need to be reduced during concomitant therapy, since concomitant administration may increase drug-induced involuntary movements (See DOSAGE AND ADMINISTRATION ). (Trihexyphenidyl label, Drug interactions)

  • ValbenazineVMAT2 inhibitorModerate

    Neuroleptic Malignant Syndrome (NMS ) A potentially fatal symptom complex referred to as Neuroleptic Malignant Syndrome (NMS) has been reported in association with drugs that reduce dopaminergic transmission. (Valbenazine label, Warnings and precautions)

  • Valsartanangiotensin II receptor blocker (ARB)Moderate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Valsartan and hydrochlorothiazideangiotensin II receptor blocker (ARB)Moderate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • Verapamilcalcium channel blockerModerate

    Antihypertensive drugs: May cause symptomatic postural hypotension. (Carbidopa and levodopa label, Drug interactions)

  • ZiprasidoneantipsychoticModerate

    Withdrawal-Emergent Hyperpyrexia and Confusion A symptom complex that resembles neuroleptic malignant syndrome (characterized by elevated temperature, muscular rigidity, altered consciousness, and autonomic instability), with no other obvious etiology, has been reported in association with rapid dose reduction, withdrawal of, or changes in dopaminergic therapy. (Carbidopa and levodopa label, Warnings and precautions)

Minor mentions (1)

  • The expected incidence of fibrotic complications is so low that even if entacapone caused these complications at rates similar to those attributable to other dopaminergic therapies, it is unlikely that it would have been detected in a cohort of the size exposed to entacapone during its clinical development. (Carbidopa, levodopa, and entacapone label, Warnings and precautions)

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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.