SIDE EFFECTS: Dry mouth, nausea, and diarrhea may occur. If any of these effects persist or worsen, notify your doctor. Tell your doctor immediately if any of these serious side effects occur: vision changes, trouble urinating, trouble breathing, unusually fast heartbeat. Tell your doctor immediately if any of these unlikely but serious side effects occur: dizziness or lightheadedness. An allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of an allergic reaction include: rash, itching, swelling. If you notice other effects not listed above, contact your doctor or pharmacist.

PRECAUTIONS: This medication is not recommended for use if you have the following medical conditions: myasthenia gravis, certain eye problems (e.g., glaucoma), prostate problems (e.g., BPH with urinary obstruction), certain heart problems (e.g., angina, tachycardia), certain stomach/intestinal problems (e.g., megacolon, stenotic lesions). Tell your doctor your medical history, especially of: other prostate problems, other heart problems (e.g., arrhythmias, coronary artery disease, CHF), certain other stomach problems (e.g., reflux disease/GERD), any allergies. This drug may make you dizzy or cause vision problems; use caution engaging in activities requiring alertness such as driving or using machinery. Limit alcoholic beverages. Caution is advised when using this drug in the elderly because they may be more sensitive to the effects of the drug. This medication should be used only when clearly needed during pregnancy. Discuss the risks and benefits with your doctor. It is not known if this medication passes into breast milk. Consult your doctor before breast-feeding.

DRUG INTERACTIONS: Tell your doctor of all prescription and nonprescription medication you may use, especially: antihistamines (e.g., chlorpheniramine, diphenhydramine), certain antidepressants (tricyclics such as amitriptyline or nortriptyline), quinidine, amantadine, disopyramide, dicyclomine, metoclopramide, MAO inhibitors (e.g., furazolidone, linezolid, phenelzine, procarbazine, selegiline, tranylcypromine), adrenalin-like drugs (e.g., ephedrine, pseudoephedrine). Do not start or stop any medicine without doctor or pharmacist approval.

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.