Effect of 2 new derivatives of imidazoline and their optical isomers on postsynaptic alpha adrenergic receptors in pithed rats

: The effects of the stereoisomers of two alpha adrenoceptor antagonists [S 10089 (Imidazolinyl-2)-2 benzocyclobutane and S 9871 (Imidazolinyl-2)-2 dihydro 2,3 benzofuran] were studied in pithed Rats. Vasoconstriction elicited via stimulation of alpha 1 adrenoceptors by cirazoline was antagonized, stimulation of alpha 2 adrenoceptors by azepexole was also antagonized by all these derivatives except (-) S 9871 which was ineffective on the pressor response of azepexole.