title: The negative inotropic action of ephedrine and its modification by various agents.
mesh_terms: D000818:Animals; D001001:Anura; D001285:Atropine / Q000494:pharmacology*; D002415:Cats; D004336:Drug Antagonism; D004357:Drug Synergism; D004809:Ephedrine / Q000494:pharmacology*; D005260:Female; D066298:In Vitro Techniques; D007545:Isoproterenol / Q000494:pharmacology*; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects*; D009132:Muscles / Q000187:drug effects; D010210:Papillary Muscles / Q000187:drug effects*; D010830:Physostigmine / Q000494:pharmacology*; D014403:Tubocurarine / Q000494:pharmacology*
chemical_list: D001285:Atropine; D010830:Physostigmine; D004809:Ephedrine; D007545:Isoproterenol; D014403:Tubocurarine