Why is this medication prescribed?

Tolterodine is used to relieve urinary difficulties, including frequent urination and inability to control urination. Tolterodine is in a class of medications called antimuscarinics. It works by preventing bladder contraction.

How should this medicine be used?

Tolterodine comes as a tablet and an extended-release (long-acting) capsule to take by mouth. The tablet is usually taken twice a day. The extended-release capsule is usually taken once a day with liquids. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take tolterodine exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.

Swallow the extended-release capsules whole; do not split, chew, or crush them.

Other uses for this medicine

This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.

What special precautions should I follow?

Before taking tolterodine,

• tell your doctor and pharmacist if you are allergic to tolterodine or any other drugs.

• tell your doctor and pharmacist what prescription and nonprescription medications you are taking, especially clarithromycin (Biaxin), erythromycin (E-mycin, Ery-Tab, others), fluconazole (Diflucan), itraconazole (Sporanox), ketoconazole (Nizoral), medications for glaucoma, and vitamins.

• tell your doctor if you have or have ever had kidney or liver disease, glaucoma, or an obstructive gastrointestinal disease, such as pyloric stenosis.

• tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking tolterodine, call your doctor.

What should I do if I forget a dose?

Take the missed dose as soon as you remember it. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Do not take a double dose to make up for a missed one.

What side effects can this medication cause?

Tolterodine may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

• dry mouth

• blurred vision

• upset stomach

• headache

• constipation

• dry eyes

• dizziness

If you experience any of the following symptoms, call your doctor immediately:

• difficulty urinating

• rash

• chest pain

If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration's (FDA) MedWatch Adverse Event Reporting program online [at http://www.fda.gov/Safety/MedWatch] or by phone [1-800-332-1088].

What storage conditions are needed for this medicine?

Keep this medication in the container it came in, tightly closed, and out of reach of children. Store it at room temperature and away from excess heat and moisture (not in the bathroom). Throw away any medication that is outdated or no longer needed. Talk to your pharmacist about the proper disposal of your medication.

In case of emergency/overdose

In case of overdose, call your local poison control center at 1-800-222-1222. If the victim has collapsed or is not breathing, call local emergency services at 911.

What other information should I know?

Keep all appointments with your doctor.

Do not let anyone else take your medication. Ask your pharmacist any questions you have about refilling your prescription.

It is important for you to keep a written list of all of the prescription and nonprescription (over-the-counter) medicines you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. You should bring this list with you each time you visit a doctor or if you are admitted to a hospital. It is also important information to carry with you in case of emergencies.