administration of the alpha 1-adrenoceptor blocking drugs , ar-c 239 and prazosin ( 5 micrograms/kg ) into the vertebral artery decreased basal mean blood pressure and increased depressor responses to the carotid sinus nerve stimulation , whereas the intracisternal injection of phenylephrine ( 30 micrograms/kg ) , a preferential alpha 1-agonist , increased mean blood pressure but inhibited the hypotension resulting from electrical stimulation .
C0032912
prazosin
C0020649
hypotension