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In page 4-Hydroxyamphetamine:

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It decreases metabolism of serotonin (5-hydroxytryptamine) and certain other monoamines by inhibiting the activity of a family of enzymes called monoamine oxidases (MAOs), particularly type A (MAO-A). The inhibition of MAO-A prevents metabolism of serotonin and catecholamines in the presynaptic terminal, and thus increases the amount of neurotransmitters available for release into the synaptic cleft.[4] 4-Hydroxyamphetamine is a major metabolite of amphetamine and a minor metabolite of methamphetamine. In humans, amphetamine is metabolized to 4-hydroxyamphetamine by CYP2D6, which is a member of the cytochrome P450 superfamily and is found in the liver.[5][6] 4-Hydroxyamphetamine is then metabolized by dopamine beta-hydroxylase into 4-hydroxynorephedrine or eliminated in the urine.[3]