DRUG INTERACTIONS: Tell your doctor of all nonprescription and prescription medication you may use, especially of: macrolide antibiotics (e.g., erythromycin, clarithromycin), azole antifungals (e.g., ketoconazole, itraconazole), anti-Parkinson's drugs (e.g., benztropine, trihexyphenidyl, other antimuscarinic drugs (e.g., scopolamine, dicyclomine), oxybutynin, cyclosporine, vinblastine. Also report other drugs which may cause drowsiness, such as: anti-anxiety or anti-seizure drugs, sedatives, tranquilizers, narcotic pain relievers, psychiatric medicines (e.g., chlorpromazine or amitriptyline), muscle relaxants, antihistamines that cause drowsiness (e.g., diphenhydramine). Check the labels on all your medicines (e.g., cough-and-cold . products) because they may contain drowsiness-causing ingredients. Ask your pharmacist about the safe use of those products. 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 difficulty urinating, difficult breathing, dilated pupils, fast heartbeat, excitation, hallucinations, and seizures.

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-up" the dose to catch up.

STORAGE: Store at room temperature between 66 and 77 degrees F (20-25 degrees C) away from light and moisture.