Monoamine Oxidase Inhibitor(s). Many antidepressants fall into this category. MAOI's inhibit the enzyme that cleans up several endogenous molecules, like seroto

Monoamine Oxidase Inhibitor(s). Many antidepressants fall into this category. MAOI's inhibit the enzyme that cleans up several endogenous molecules, like serotonin, and some drugs, like the amphetamines.