The effects of some drugs can change if you take other drugs or herbal products at the same time. This can increase your risk for serious side effects or may cause your medications not to work correctly. These drug interactions are possible, but do not always occur. Your doctor or pharmacist can often prevent or manage interactions by changing how you use your medications or by close monitoring.

To help your doctor and pharmacist give you the best care, be sure to tell your doctor and pharmacist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products) before starting treatment with this product. While using this product, do not start, stop, or change the dosage of any other medicines you are using without your doctor's approval.

Some products that may interact with this drug include: "blood thinners" (such as warfarin), mefloquine, penicillamine.

Other medications can affect the removal of quinine from your body, which may affect how quinine works. Examples include cimetidine, erythromycin, ketoconazole, troleandomycin, phenytoin, rifampin, ritonavir, urinary alkalinizers such as acetazolamide/sodium bicarbonate, among others.

This medication can slow down the removal of other medications from your body, which may affect how they work. Examples of affected drugs include desipramine, digoxin, certain "statin" drugs (atorvastatin, lovastatin, simvastatin), certain anticonvulsants (carbamazepine, phenobarbital), among others.

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

Cimetidine is a nonprescription drug that is commonly used to treat extra stomach acid (such as heartburn, ulcers). Because cimetidine and aluminum/magnesium antacids may interact with quinine, ask your pharmacist about other products to treat extra stomach acid.

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 a 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: sudden vision change, confusion, severe trouble hearing, fast/irregular heartbeat, fainting, slow/shallow breathing, seizures, inability to wake up (coma).

NOTES: Do not share this medication with others.

Laboratory and/or medical tests (such as G6PD blood level, vision tests, blood potassium, liver tests, kidney tests, EKG) may be performed before you start this medication. Consult your doctor for more details.

MISSED DOSE: If you miss a dose, take it as soon as you remember. If it is within 4 hours of the time for 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 77-86 degrees F (25-30 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.

Information last revised June 2011. Copyright(c) 2011 First Databank, Inc.