<P> An anticholinergic agent is a substance that blocks the neurotransmitter acetylcholine in the central and the peripheral nervous system . These agents inhibit parasympathetic nerve impulses by selectively blocking the binding of the neurotransmitter acetylcholine to its receptor in nerve cells . The nerve fibers of the parasympathetic system are responsible for the involuntary movement of smooth muscles present in the gastrointestinal tract, urinary tract, lungs, and many other parts of the body . Anticholinergics are divided into three categories in accordance with their specific targets in the central and peripheral nervous system: antimuscarinic agents, ganglionic blockers, and neuromuscular blockers . </P> <P> Anticholinergic drugs are used to treat a variety of conditions: </P>

What is the mechanism of action of anticholinergic drugs
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