Used primarily to treat overactive bladder by relaxing the muscles in the bladder and urinary tract. Helps reduce symptoms like frequent urination, urgency, and incontinence. Commonly prescribed for adults and sometimes for children with neurogenic bladder conditions. Available in oral, transdermal patch, and gel forms to improve patient compliance and reduce side effects like dry mouth. Also used off-label to manage excessive drooling and hyperhidrosis due to its anticholinergic properties.