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  • Title: Maximizing anticholinergic therapy for overactive bladder: has the ceiling been reached?
    Author: MacDiarmid SA.
    Journal: BJU Int; 2007 Jun; 99 Suppl 3():8-12. PubMed ID: 17488367.
    Abstract:
    Urinary incontinence affects an estimated 20-33% of adults the USA and 55% of the country's elderly [1], having a more substantial impact on the physical and mental dimension of quality of life than other common chronic diseases. Muscarinic receptor antagonists, including oxybutynin, tolterodine, trospium chloride, darifenacin, and solifenacin, are front-line therapies for overactive bladder (OAB), with an efficacy of 65-75% in reducing major symptoms. Strategies to increase the therapeutic index have included behavioural therapy, flexible dosing, and dose escalation, as well as newer formulations that reduce anticholinergic side-effects. Among approved OAB agents, the oxybutynin transdermal-delivery system has been associated with a lower incidence of dry mouth than immediate- and extended-release formulations of traditional agents. With a low propensity for drug interactions and dry mouth, it is a likely candidate for older patients taking multiple medications. The transdermal patch bypasses systemic and first-pass metabolism, avoiding higher plasma concentrations of the active metabolite (N-desethyloxybutynin) thought to be associated with dry mouth symptoms. Anticholinergics have a significant role to play in the management of OAB; newer drugs targeted toward muscarinic receptors, and novel delivery systems, continue to increase the therapeutic index for this condition.
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