In vivo inhibition of platelet MAO activity by tricyclic antidepressants

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Abstract
Platelet MAO activity decreased by 40% (p less than .001) in a group of 11 male patients with primary depression after 3 weeks of treatment with either amitriptyline or imipramine. This finding, together with data from previous in vitro studies demonstrating tricyclic-induced inhibition of mitochondrial MAO, suggests that inhibition of MAO plays a role in the clinical action of tricyclic antidepressant drugs.