A pharmacological effect where the action of acetylcholine, a chemical neurotransmitter released at the junctions (synapses) of parasympathetic and ganglionic nerves, is inhibited. The junctions between nerves and skeletal muscles have nicotinic receptors. A wide range of drugs with antimuscarinic effects are in use for various disorders including psychosis, bronchospasm, disorders of the eye, parkinsonism, and problems of the gastrointestinal tract and urinary tract.