Transdermal oxybutynin: a new treatment for overactive bladder.

Overactive bladder has been successfully treated with oral anticholinergic drugs such as oxybutynin chloride. Although oral oxybutynin has been effective in controlling urinary urge incontinence and in decreasing incontinence episodes, adverse events, particularly dry mouth, often cause patients to discontinue oral therapy and to endure incontinence. Transdermal oxybutynin (Oxytrol, Watson Pharmaceuticals) is applied twice-weekly to maintain the efficacy of oral oxybutynin while significantly minimising side effects (e.g., dry mouth) that complicate therapy. By avoiding hepatic and gastrointestinal metabolism of oxybutynin, less N-desethyloxybutynin (N-DEO), the compound thought to be responsible for anticholinergic side effects, such as dry mouth, is produced. The new transdermal oxybutynin formulation offers patients with urinary incontinence an effective, safe and well-tolerated option for managing the symptoms of overactive bladder.