SPL Set ID: 363c1e77-e482-47b2-aa1e-851abd770aeb

Sildenafil tablets USP, an oral therapy for erectile dysfunction, is the citrate salt of sildenafil, a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5). Sildenafil citrate is designated chemically as 1-[[3-(6,7-dihydro-1-methyl-7-oxo-3-propyl-1 H -­pyrazolo[4,3- d ]pyrimidin-5-yl)-4-ethoxyphenyl]sulfonyl]-4-methylpiperazine citrate and has the following structural formula: Sildenafil citrate USP is a white or almost white slightly hygroscopic crystalline powder, slightly soluble in water, in methanol and practically insoluble in hexane and a molecular weight of 666.7. Sildenafil tablets, USP are formulated as white to off-white, diamond shaped, biconvex, film-coated tablets for oral administration. Each tablet contains sildenafil citrate USP equivalent to 25 mg, 50 mg and 100 mg of sildenafil. In addition to the active ingredient, sildenafil citrate, each tablet contains the following inactive ingredients: colloidal silicon dioxide, croscarmellose sodium, dibasic calcium phosphate anhydrous, hypromellose, lactose monohydrate, magnesium stearate, microcrystalline cellulose, titanium dioxide, and triacetin. structure