Detrol (generic: tolterodine) is a prescription medication used to treat the symptoms of an overactive bladder in adults.  Detrol belongs to a group of drugs called antimuscarinic medications, which help the bladder muscles to relax.

This medication comes in an immediate-release tablet form that is usually taken twice a day with or without food.  It also comes in a long-acting capsule form (Detrol LA) that is usually taken once a day with water.  Detrol LA capsules should be swallowed whole.

Common side effects of Detrol include dry mouth, dizziness, and headache.