title: Drug interactions at (pharmacodynamically active) receptor sites.
mesh_terms: D000818:Animals; D003238:Connective Tissue / Q000187:drug effects; D004347:Drug Interactions; D064420:Drug-Related Side Effects and Adverse Reactions; D006439:Hemodynamics / Q000187:drug effects; D006633:Histamine Antagonists; D006801:Humans; D011950:Receptors, Cholinergic / Q000187:drug effects; D011955:Receptors, Drug / Q000187:drug effects* / Q000378:metabolism; D012137:Respiratory System / Q000187:drug effects; D013564:Sympathetic Nervous System / Q000187:drug effects; D009435:Synaptic Transmission / Q000187:drug effects
chemical_list: D006633:Histamine Antagonists; D011950:Receptors, Cholinergic; D011955:Receptors, Drug