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This drug should not be used with the following medications because very serious (possibly fatal) interactions may occur: certain HIV protease inhibitors (e.g., ritonavir, nelfinavir, saquinavir), azole antifungals (e.g., itraconazole, ketoconazole, voriconazole), propafenone, cisapride, arbutamine, mefloquine.

If you are currently using any of these medications listed above, tell your doctor or pharmacist before starting quinidine.

Many drugs besides quinidine may affect the heart rhythm (QT prolongation), including amiodarone, dofetilide, pimozide, procainamide, sotalol, macrolide antibiotics (such as erythromycin), ziprasidone, mesoridazine, thioridazine, among others. Therefore, before using quinidine, report all medications you are currently using to your doctor or pharmacist.

Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription/herbal products you may use, especially: large amounts of antacids (e.g., sodium bicarbonate), barbiturates (e.g., phenobarbital), carbamazepine, rifamycins (e.g., rifampin, rifabutin), phenytoin, carbonic anhydrase inhibitors (e.g., acetazolamide), aripiprazole, atomoxetine, codeine, hydrocodone, loperamide, medication for high blood pressure (e.g., nifedipine, verapamil, diltiazem), certain macrolide antibiotics (e.g., erythromycin, clarithromycin), quinupristin/dalfopristin, etravirine, amprenavir/fosamprenavir.

This document does not contain all possible interactions. Therefore, before using this product, tell your doctor or pharmacist of all the products you use. Keep a list of all your medications with you, and share the list with your doctor and pharmacist.

OVERDOSE: If overdose is suspected, contact your local poison control center or emergency room immediately. US residents can call the US National Poison Hotline at 1-800-222-1222. Canada residents can call a provincial poison control center. Symptoms of overdose may include: severe dizziness/fainting, hallucinations, seizures.

NOTES: Do not share this medication with others.

Laboratory and/or medical tests (e.g., complete blood count, liver/kidney function tests, quinidine blood levels, EKG) should be performed periodically to monitor your progress or check for side effects. Consult your doctor for more details.

MISSED DOSE: If you miss a dose, take it as soon as you remember. If it is near the time of the next dose, skip the missed dose and resume your usual dosing schedule. Do not double the dose to catch up.

STORAGE: Store at room temperature between 59-86 degrees F (15-30 degrees C) away from light and moisture. Do not store in the bathroom. Keep all medicines away from children and pets.

Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company for more details about how to safely discard your product.

MEDICAL ALERT: Your condition can cause complications in a medical emergency. For information about enrolling in MedicAlert, call 1-800-854-1166 (USA) or 1-800-668-1507 (Canada).

Information last revised September 2010 Copyright(c) 2010 First DataBank, Inc.