Fesoterodine fumarate.

Overactive bladder (OAB) is a common condition that causes a profound impact on an individual's overall health and quality of life. Muscarinic antagonists are the mainstay of oral pharmacotherapy for OAB. The most-recently introduced muscarinic antagonist, fesoterodine fumarate, is unique in that the parent compound has no antimuscarinic efficacy due to its rapid and complete hydrolysis after oral administration. The active metabolite, 5-hydroxymethyl tolterodine, is responsible for all of the antimuscarinic effects. In two phase III studies, fesoterodine has been shown to significantly reduce mean urgency and urge urinary incontinence (UUI) episodes over placebo. As many as 60% of patients actively treated with fesoterodine reported no urge urinary incontinence episodes on a 3-day voiding diary, a significant improvement over placebo. Finally, several quality of life indices were significantly improved over placebo. There was a dose-related increase in antimuscarinic adverse events, such as dry mouth and constipation; however, few patients discontinued fesoterodine due to side effects.