Синонимы: Sildenafil Citrate Imp. B (EP), Sildenafil Imp. B (EP), 5-[2-Ethoxy-5-[(4-methyl-4-oxidopiperazin-1-yl)sulfonyl]phenyl]-1-methyl-3-propyl-6,7-dihydro-1Hpyrazolo[4,3-d]pyrimidin-7-one, Sildenafil N-Oxide, Sildenafil Citrate Impurity B, Sildenafil Impurity B