anticholinergic

Any drug that blocks the passage of certain nerve impulses in the central nervous system by inhibiting the production of acetylcholine, a neurotransmitter.

Its wide range of effects makes it an effective component of premedication before surgery; it may be put in the eyes before examination or treatment to dilate the pupil and paralyse the muscles of accommodation, or inhaled to relieve constriction of the airways in bronchitis. Tremor and rigidity can be reduced in mild Parkinson's disease. Bladder muscle tone may also be improved in the treatment of frequent urination. Its usefulness as an antispasmodic is limited by side effects, such as dry mouth, visual disturbances, and urinary retention.