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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The in vitro metabolism of hydralazine.

Hydralazine was metabolized in vitro to phthalazine and phthalazine-1-one by microsomal enzymes requiring NADPH. Hydrazine was not detected as a metabolite under these in vitro conditions. Addition of 1-hydrazinophthalazin-4-one, a possible intermediate metabolite, decreased covalent binding to protein but also decreased metabolism. Phthalazine and phthalazin-1-one also decreased covalent binding to protein to a lesser extent. N-Acetylcysteine significantly decreased the level of phthalazine and phthalazin-1-one detected in microsomal incubations. The results are consistent with a reactive intermediate, but not 1-hydrazinophthalazin-4-one, being responsible for both covalent binding and production of phthalazine.[1]


  1. The in vitro metabolism of hydralazine. Streeter, A.J., Timbrell, J.A. Drug Metab. Dispos. (1985) [Pubmed]
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