Anticholinergic agents are a class of medications that block the action of the neurotransmitter acetylcholine in the nervous system. They are commonly used to treat various conditions, including asthma, chronic obstructive pulmonary disease (COPD), and overactive bladder. By inhibiting acetylcholine, these drugs help reduce muscle spasms and secretions in the body. These agents can also be used in the treatment of Parkinson's disease and to manage symptoms of motion sickness. While effective, anticholinergic agents may cause side effects such as dry mouth, blurred vision, and constipation, making it important for patients to discuss their use with a healthcare provider.