inversely , dopamine presents as a hypotensive agent , opposing effects of adrenaline and noradrenaline and possessing numerous sites of action : central hypotensive action on cardiovascular integration structures , inhibitory effect on sympathetic ganglionic neurotransmission , action on specific presynaptic receptors at nerve endings , reducing sympathetic vasoconstrictor tone and finally a direct vasodilator effect .
C0014563
adrenaline
C0028351
noradrenaline