Fate of hydralazine in man. II. Formation of tetrazolo(5,1-a)phthalazine in vivo and inhibition of monoamine oxidase by this metabolite.

Abstract
Tetrazolo[5,1-.alpha.]phthalazine (tetra-P) was detected in the urine of a patient on hydralazine [an automonic antihypertenive which increases renal blood flow] treatment. Tetra-P is a new type of monoamine oxidase (MAO) inhibitor.

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