neither other vasodilator agents ( acetylcholine , tolazoline , histamine , isoproterenol , sodium arachidonate , the prostaglandin analog cl115 , 347 ) nor vasoconstrictor substances ( norepinephrine , epinephrine , phenylephrine , and ergonovine maleate ) produced the same effect .
C0028351
norepinephrine
C0014563
epinephrine