title: How drugs act. Drugs and the parasympathetic nervous system.
mesh_terms: D000109:Acetylcholine / Q000502:physiology*; D001533:Belladonna Alkaloids / Q000494:pharmacology; D006801:Humans; D010275:Parasympathetic Nervous System / Q000187:drug effects / Q000502:physiology*; D010276:Parasympatholytics / Q000494:pharmacology*; D010277:Parasympathomimetics / Q000494:pharmacology*
chemical_list: D001533:Belladonna Alkaloids; D010276:Parasympatholytics; D010277:Parasympathomimetics; D000109:Acetylcholine