Pirenzepine

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Pirenzepine (markated by Merck Marker under the trade-name Gastrozepin) is used in the treatment of peptic ulcers, as it reduces gastric acid secretion and reduces muscle spasm. It is in a class of drugs known as Muscarinic (Acetylcholine) receptor antagonists - acetyl choline being the neurotransmitter of the parasympathetic nervous system which initiates the rest-and-digest state (as aposed to fight-or-flight), the result being an increase in gastric motility and digestion.

Pirenzepine has been investigated for use in myopia control[link].

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