Molecular model of oxybutynin. Carbon: gray; Hydrogen: yellow; Nitrogen: blue; Oxygen: red. Oxybutynin (Oxytrol, Ditropan, Ditrospam, Lyrinel XL) is an anticholinergic medication used to relieve urinary and bladder difficulties, including frequent urination and inability to control urination (urge incontinence), by decreasing muscle spasms of the bladder. It is also used to treat hyperactive sweating (hyperhidrosis). Formula: C22 H31 N O3. Molecular mass: 357.486 g/mol.