whereas iiiv pretreatment with phentolamine ( 71 nmol ) , a nonselective alpha-adrenoceptor antagonist , or prazosin ( 9.5 nmol ) , a selective alpha 1-adrenoceptor antagonist , was without effect on npy-induced feeding behavior , pretreatment with the alpha 2-adrenoceptor antagonist yohimbine ( 15 nmol ) dramatically attenuated the stimulatory effects of npy or epinephrine on both food intake ( by over 50 % ) and local eating rate .
C0034784
alpha-adrenoceptor
C0001638
alpha 1-adrenoceptor