The Medical Letter on Drugs and Therapeutics
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1331
Topical Oxybutynin (Gelnique) for Overactive Bladder
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The FDA has approved the marketing of a 10% topical gel formulation of the muscarinic receptor antagonist oxybutynin chloride (Gelnique– Watson) for treatment of overactive bladder. Oxybutynin is also available for this indication as oral tablets, an oral syrup and a transdermal patch.1

TREATMENT OF OVERACTIVE BLADDER — Overactive bladder causes urgency, frequency, nocturia and incontinence, especially in the elderly. Antimuscarinic drugs are generally used to treat symptoms, but they cause dry mouth and constipation, and can cause confusion or cognitive loss in elderly patients.2

PHARMACOKINETICS — Transdermal administration of oxybutynin avoids first-pass metabolism, reducing the formation of N-desethyloxybutynin, an active metabolite.3 Following oral administration, serum concentrations of the active metabolite are ... more      

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