in addition , our results suggest that the inhibitory effect of fenoldopam on the vasoconstrictor response to noradrenaline may be due to an antagonistic action at postsynaptic alpha-adrenoceptors , while its potentiating effect on neurogenic vasoconstriction is due to blockade of presynaptic alpha 2-adrenoceptors .
C0034784
alpha-adrenoceptors
C0001639
alpha 2-adrenoceptors