Detrol is a prescription medication available in tablet form with dosages of 1mg, 2mg, 2mg XR, 4mg, and 4mg XR. It is commonly used to manage symptoms of an overactive bladder, including frequent urination and an urgent need to urinate. The active component, tolterodine, works by relaxing the bladder muscles. Detrol is manufactured by reputable pharmaceutical companies and is also marketed under various brand names such as Tolu, Roliten, and others.