There is good evidence that the facilitation of peripheral sympathetic nervous system transmission produced by the amphetamines also occurs in the CNS. The possibility that amphetamines act indirectly (i.e., by releasing monoamines) at monoaminergic synapses in the brain and spinal cord seems likely. However, amphetamine has effects beyond displacement of catecholamines; these include inhibition of neuronal amine uptake, direct stimulation of dopamine and serotonin receptors, antagonism of catecholamine action at certain subtypes of adrenocep-tors, and inhibition of monoamine oxidase. Interestingly, none of these actions explains the therapeutic benefit of the amphetamines in hyperkinetic children.
Was this article helpful?