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What should I know about quinidine before taking it?

Quinidine is a prescription medication that treats irregular heartbeat. It may worsen certain heart rhythm problems caused by an electrolyte disorder. Quinidine may also make heart disease and myasthenia gravis worse. If you have kidney or liver disease, the side effects of quinidine may be increased because the medication will stay in the bloodstream longer. You should not drink grapefruit juice or eat grapefruit while taking quinidine. Quinidine can interact with many medications. Tell your doctor if you are taking any of the following: other medications to treat irregular heartbeats, beta-blockers, a tricyclic antidepressant, phenothiazine, pimozide, itraconazole, ziprasidone, voriconazole, thioridazine, mesoridazine, ritonavir, dolasetron, digoxin, warfarin, erythromycin, sparfloxacin, levofloxacin and gatifloxacin.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.