the alpha-sympatholytic properties of the tricyclic antidepressants probably give rise to a blockade of the central alpha-adrenoreceptors , stimulated by clonidine , noradrenaline ( via amphetamine ) and alpha-methylnoradrenaline ( from alpha-methyl-dopa ) .
C0028351
noradrenaline
C0025805
alpha-methylnoradrenaline