Amiloride
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Decreases the antiarrhythmic effect of quinidine
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Aminophylline
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The barbiturate, quinidine barbiturate, decreases the effect of aminophylline.
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Amiodarone
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Increases the effect of qiunidine
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Amitriptyline
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Quinidine barbiturate increases the effect of tricyclic antidepressant, amitriptyline.
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Aripiprazole
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Quinidine increases the effect and toxicity of aripiprazole
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Atazanavir
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Increased risk of cardiotoxicity and arrhythmias
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Atomoxetine
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The CYP2D6 inhibitor could increase the effect and toxicity of atomoxetine
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Betamethasone
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The barbiturate, quinidine barbiturate, may decrease the effect of the corticosteroid, betamethasone.
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Cimetidine
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Increases the effect of quinidine
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Cisapride
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Increased risk of cardiotoxicity and arrhythmias
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Clarithromycin
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Increased risk of cardiotoxicity and arrhythmias
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Clomipramine
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Quinidine barbiturate increases the effect of tricyclic antidepressant, clomipramine.
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Codeine
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Quinidine decreases the analgesic effect of codeine
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Cyclosporine
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The barbiturate, quinidine barbiturate, increases the effect of cyclosporine.
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Desipramine
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Quinidine barbiturate increases the effect of tricyclic antidepressant, desipramine.
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Dexamethasone
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The barbiturate, quinidine barbiturate, may decrease the effect of the corticosteroid, dexamethasone.
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Dextromethorphan
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Quinidine increases the toxicity of dextromethorphan
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Digoxin
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Quinine/quinidine increases the effect of digoxin
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Diltiazem
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Increases the effect and toxicity of quinidine
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Donepezil
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Possible antagonism of action
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Doxepin
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Quinidine barbiturate increases the effect of tricyclic antidepressant, doxepin.
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Doxycycline
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The anticonvulsant, quinidine barbiturate, decreases the effect of doxycycline.
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Erythromycin
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Increased risk of cardiotoxicity and arrhythmias
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Felodipine
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The barbiturate, quinidine barbiturate, decreases the effect of felodipine.
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Fludrocortisone
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The barbiturate, quinidine barbiturate, may decrease the effect of the corticosteroid, fludrocortisone.
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Folic Acid
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Folic acid decreases the effect of anticonvulsant, quinidine barbiturate.
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Galantamine
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Possible antagonism of action
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Gatifloxacin
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Increased risk of cardiotoxicity and arrhythmias
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Gefitinib
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The CYP3A4 inducer, quinidine barbiturate, may decrease the serum concentration and therapeutic effects of gefitinib.
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Grepafloxacin
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Increased risk of cardiotoxicity and arrhythmias
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Griseofulvin
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The barbiturate, quinidine barbiturate, decreases the effect of griseofulvin.
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Hydrocortisone
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The barbiturate, quinidine barbiturate, may decrease the effect of the corticosteroid, hydrocortisone.
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Imipramine
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Quinidine barbiturate increases the effect of tricyclic antidepressant, imipramine.
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Itraconazole
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Itraconazole may increase the effect and toxicity of quinidine barbiturate.
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Ketoconazole
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Ketoconazole may increase the effect and toxicity of quinidine barbiturate.
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Levofloxacin
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Increased risk of cardiotoxicity and arrhythmias
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Levonorgestrel
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Phenobarbital decreases the effect of levonorgestrel
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Magnesium
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The antiacid decreases the absorption of quinidine
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Mesoridazine
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Increased risk of cardiotoxicity and arrhythmias
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Methadone
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The barbiturate, quinidine barbiturate, decreases the effect of methadone.
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Metronidazole
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The barbiturate, quinidine barbiturate, decreases the effect of metronidazole.
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Moxifloxacin
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Increased risk of cardiotoxicity and arrhythmias
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Nelfinavir
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Nelfinavir increases the effect and toxicity of quinidine
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Nifedipine
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Decreased quinidine effect, increased nifedipine effect
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Nortriptyline
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Quinidine barbiturate increases the effect of the tricyclic antidepressant, nortriptyline.
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Ofloxacin
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Increased risk of cardiotoxicity and arrhythmias
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Oxtriphylline
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The barbiturate, quinidine barbiturate, decreases the effect of oxtriphylline.
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Prednisolone
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The barbiturate, quinidine barbiturate, may decrease the effect of the corticosteroid, prednisolone.
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Prednisone
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The barbiturate, quinidine barbiturate, may decrease the effect of the corticosteroid, prednisone.
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Procainamide
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Quinidine increases the effect of procainamide
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Propafenone
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Quinidine increases the effect of propafenone
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Quinidine
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The anticonvulsant, quinidine. barbiturate, decreases the effect of quinidine.
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Quinupristin
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This combination presents an increased risk of toxicity
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Rifampin
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Rifampin decreases the effect of quinidine
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Telithromycin
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Increased risk of cardiotoxicity and arrhythmias
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Theophylline
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The barbiturate, quinidine barbiturate, decreases the effect of theophylline.
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Thioridazine
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Increased risk of cardiotoxicity and arrhythmias
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Triamcinolone
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The barbiturate, quinidine barbiturate, may decrease the effect of the corticosteroid, triamcinolone.
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