Tolterodine reduces spasms of the bladder muscles.

Tolterodine is used to treat overactive bladder with symptoms of urinary frequency, urgency, and incontinence.

Tolterodine may also be used for purposes not listed in this medication guide.

You should not take this medication if you are allergic to tolterodine or fesoterodine (Toviaz), if you have untreated or uncontrolled narrow-angle glaucoma, or if you have a blockage of the urinary tract, stomach, or intestines.

Before you take tolterodine, tell your doctor if you have kidney or liver disease, glaucoma, myasthenia gravis, or a personal or family history of "Long QT syndrome."

Do not crush, chew, break, or open a controlled-release capsule. Swallow it whole. Breaking or opening the pill may cause too much of the drug to be released at one time.

Tolterodine may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert.

Drinking alcohol can increase some of the side effects of tolterodine.

There are many other drugs that can interact with tolterodine. Tell your doctor about all medications you use. This includes prescription, over the counter, vitamin, and herbal products. Do not start a new medication without telling your doctor. Keep a list of all your medicines and show it to any healthcare provider who treats you.

You should not use this medication if you are allergic to tolterodine or fesoterodine (Toviaz), or if you have:

• a blockage of the urinary tract (difficulty urinating);

• a blockage in your stomach or intestines; or

• untreated or uncontrolled narrow-angle glaucoma.

To make sure you can safely take tolterodine, tell your doctor if you have any of these other conditions:

• liver disease;

• kidney disease;

• myasthenia gravis;

• glaucoma; or

• a personal or family history of Long QT syndrome.

FDA pregnancy category C. It is not known whether tolterodine will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant while using this medication..

It is not known whether tolterodine passes into breast milk or if it could harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.