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How the Bladder Works

Each time you eat and drink, your body absorbs liquids. These liquids pass through your kidneys, which filter out waste and extra water to make urine. Your bladder stores this urine. Once the bladder is full, it signals the brain that it’s time to go. That's when you get the feeling that you need to go to the bathroom.

A normal bladder

You decide when it’s time to go to the bathroom

The bladder is a muscle that can expand like a balloon to hold up to 2 cups of urine. As it fills up, you feel stronger and stronger urges to go. And when you feel ready, you go to the bathroom.

An overactive bladder

Your bladder forces you to rush to the bathroom

In an overactive bladder, the bladder muscle starts squeezing to push urine out before you’re ready to go—even if your bladder isn’t full. These contractions can create strong sudden urges to go, which can lead to leaks.

Learn how the bladder works and what causes symptoms of OAB

Next page Causes of OAB Symptoms

Important Safety Information

If you have certain stomach problems, glaucoma, or cannot empty your bladder, you should not take Toviaz^® (fesoterodine fumarate).

Medicines like Toviaz can cause blurred vision, drowsiness, and decreased sweating. Use caution when driving, doing unsafe tasks, or in especially hot environments, until you know how Toviaz affects you. Drinking alcohol while taking medicines such as Toviaz may cause increased drowsiness.

The most common side effects are dry mouth and constipation.