Ask a doctor or pharmacist before using any other medicine. Anticholinergics can make you drowsy, particularly when you first begin taking the medication and whenever your dose is increased or decreased. Drowsiness may worsen while you are driving or if you get up suddenly from a lying or sitting position. To avoid falling asleep: do not lay down for at least 30 minutes after taking this medicine; try to sit down in an upright position (one that does not force your head forward); take frequent breaks during the day to stand up and walk around; wear loose-fitting clothing that allows your arms to move freely; talk with others as little as possible (do not hold long conversations). Side effects: dizziness, dry mouth, blurred vision, constipation, nausea/vomiting/diarrhea/loss of appetite/weight loss.