Studies on the mechanism of the venoconstrictor activity of ergotamine on isolated canine saphenous veins.

Animals Cocaine/pharmacology Dogs Dose-Response Relationship, Drug Drug Synergism Ergotamine/administration & dosage,antagonists & inhibitors,pharmacology Female Male Muscle Contraction/drug effects Muscle, Smooth/drug effects Norepinephrine/administration & dosage,antagonists & inhibitors,pharmacology Phentolamine/pharmacology Saphenous Vein/drug effects Tyramine/pharmacology

Cocaine Ergotamine Norepinephrine Tyramine Phentolamine