Anticholinergic drugs are medications that block the action of a neurotransmitter called acetylcholine. This neurotransmitter is involved in many bodily functions, including muscle movement and the regulation of the autonomic nervous system. By inhibiting acetylcholine, these drugs can help reduce symptoms in various conditions, such as asthma, COPD, and certain types of incontinence. These medications can also be used to treat symptoms of Parkinson's disease and to prevent motion sickness. However, they may cause side effects like dry mouth, blurred vision, and constipation. It's important for patients to discuss potential risks and benefits with their healthcare provider before starting treatment.