the results are consistent with the hypothesis that indoramin produces selective postsynaptic alpha 1-adrenoceptor blockade in man , and therefore produces relatively less tachycardia and na increase than does a non-selective alpha-adrenoceptor antagonist ( phenoxybenzamine ) or an arteriolar vasodilator ( hydralazine ) .
C0001638
alpha 1-adrenoceptor
C0034784
alpha-adrenoceptor