Standards; Steroids; Enzyme Activators and Inhibitors; Pharmaceutical/API Drug Impurities/Metabolites;
Dihydro Finasteride (Finasteride EP Impurity A) is the reduced product of Finasteride (F342000): a mechanism-based inhibitor of human prostate and skin steroid 5a-reductase. It forms an enzyme-bound NADP-dihydrofinasteride adduct during this inhibitory process.