INHIBITION OF ADRENALINE‐INDUCED PLATELET AGGREGATION BY THE α‐ADRENOCEPTOR BLOCKING DRUG BENEXTRAMINE

Abstract
1 The activity of the irreversible α-adrenoceptor blocking drug, benextramine, was determined in human platelets. 2 Compared to its postsynaptic and presynaptic α-adrenoceptor blocking potency, benextramine had a very low potency as an antagonist of adrenaline-induced platelet aggregation. 3 The results confirm the previous observation with the irreversible α-adrenoceptor blocking drug, phenoxybenzamine, that platelet α-adrenoceptors differ from postsynaptic and presynaptic α-adrenoceptors.