Anticholinergics are used to treat many conditions including irritable bowel syndrome (IBS), overactive bladder, and motion sickness. They also have other uses, such as managing symptoms of Parkinson's disease. Anticholinergics work by blocking the action of acetylcholine, a chemical that helps muscles contract, which helps to relax muscles and reduce spasms. These medications come in different forms, including oral pills, oral solutions, and transdermal patches. Examples include dicyclomine (Bentyl), hyoscyamine (Levsin), and scopolamine (Transderm Scop). Your prescriber can help you choose the form that best fits your needs.