the antagonism of methoxamine-evoked mydriasis is likely to reflect the blockade of postsynaptic alpha 1-adrenoceptors in the iris by the antidepressants , whereas the antagonism of tyramine-evoked mydriasis may reflect both the blockade of uptake of tyramine into presynaptic adrenergic terminals and the blockade of postsynaptic alpha-adrenoceptors .
C0001638
alpha 1-adrenoceptors
C0034784
alpha-adrenoceptors