the agonists order of potency to compete with [ 3h ] idazoxan was clonidine much greater than phenylephrine = greater than ( - ) -adrenaline greater than ( - ) -noradrenaline , and for other related drugs it was ( - ) -propranolol much greater than dopamine much greater than serotonin greater than ( - ) -isoproterenol .
C0014563
adrenaline
C0028351
noradrenaline