N-Desmethyl sildenafil is a major metabolite of sildenafil . N-Desmethyl sildenafil is formed via oxidative metabolism of sildenafil by the cytochrome (CYP) P450 isoforms CYP3A4, CYP3A5, and CYP3A7.
Sildenafil chlorosulfonyl is a synthetic intermediate in the synthesis of the phosphodiesterase 5 (PDE5) inhibitor sildenafil .1It is also a potential impurity found in commercial preparations of sildenafil. 1.Nagaraju, V., Sreenath, D., Rao, J.T., et al.Separation and determination of synthetic impurities of sildenafil (Viagra) by reversed-phase high-performance liquid chromatographyAnal. Sci.19(7)1007-1011(2003)
Sildenafil nitrate is a selective inhibitor of PDE5 (type 5 cGMP phosphodiesterase) which catalyzes the hydrolysis of 3',5'-cyclic guanosine monophosphate (cGMP).