The drug Oxytrol has been approved by the U.S. Food and Drug Administration as the first over-the-counter treatment for women 18 and older with overactive bladder.

Oxytrol contains oxybutynin, among a class of drugs called anticholinergics that are designed to relax the bladder muscle. Oxytrol is a patch applied to the skin every four days, the FDA said in a news release.

The drug will remain available for adult men by prescription only, the agency said.


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Side effects reported during clinical testing included skin irritation at the patch site, dry mouth, and constipation.

Oxytrol for Women is marketed by Merck, based in Whitehouse Station, N.J.