in frontal cortex , the rank order of potency of adrenergic drugs competing with [ 3h ] uk 14304 or [ 3h ] clonidine showed the specificity for an alpha 2a-adrenoceptor : uk 14304 approximately equal to yohimbine approximately equal to oxymetazoline approximately equal to clonidine greater than phentolamine approximately equal to ( - ) -adrenaline greater than idazoxan approximately equal to ( - ) -noradrenaline greater than phenylephrine greater than ( +/- ) -adrenaline much greater than corynanthine greater than prazosin much greater than ( +/- ) -propranolol .
C0028351
noradrenaline
C0014563
adrenaline