for the agonists : clonidine much greater than ( - ) -noradrenaline much greater than ( - ) -adrenaline much greater than phenylephrine , while other drugs , such as ( - ) -propranolol , dopamine , ( - ) -isoproterenol and serotonin only competed with the alpha-1-ligand at concentrations above 20 microm .
C0028351
noradrenaline
C0014563
adrenaline