Sildenafil Citrate USP Pharma Materials Pure Viagra Sex Tablets Active Raw Powder Sildenafil Citrate (Viagra) Basic Info: CAS Number: 171599-83-0 M.F.: C28H38N6O11S M.W.: 666.7Appearance: White fine powder What is Sildenafil Citrate (Viagra) ? Sildenafil, commonly known by the trade name Viagra is an oral medication used for the treatment of erectile dysfunction (ED). Pfizer commercially released Viagra in 1996 officially making it …