Hi & Welcome. I appreciate your concern for your beloved husband who seems to have developed urinary incontinence for which his physician has prescribed Oxybutynin. Oxybutynin is an antispasmodic used to treat symptoms of an overactive bladder, such as incontinence (loss of bladder control) or a frequent need to urinate. If taken along with Carbidopa/Levodopa combination, it may decrease the beneficial effects of Levodopa so, he may need a dose adjustment or special test to safely use both the medications. Hope these answer your query.