DRUG INTERACTIONS: Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription products you may use, especially of: allergy medications (e.g., diphenhydramine), amantadine, corticosteroids (e.g., prednisone), digoxin, disopyramide, ketoconazole, medications for Parkinson's disease, potassium supplements (specifically wax-matrix preparations), phenothiazines (e.g., chlorpromazine, promethazine), procainamide, quinidine, tricyclic anti-depressants (e.g., amitriptyline). Do not start or stop any medicine without doctor or pharmacist approval.

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. Canadian residents should call their local poison control center directly. Symptoms of overdose may include: restlessness, seizures, mental/mood changes, hallucinations, rapid heartbeat, or muscle weakness.

NOTES: Do not share this medication with others.

MISSED DOSE: If you miss a dose, use 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 68-77 degrees F (20-25 degrees C) away from light and moisture. Do not store in the bathroom. Keep all medicines away from children and pets.

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

Report Problems to the Food and Drug Administration You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088. Need help identifying pills and medications? Use the pill identifier tool on RxList.