Revatio contains the same active substance, sildenafil, as used in Viagra that is used to treat men with male erectile dysfunction (MED). Sildenafil belongs to a class of medicine called phosphodiesterase type 5 (PDE5) inhibitors. Under the agreement, Roman’s generic sildenafil citrate offering will be sourced exclusively from Greenstone and manufactured in the same European facilities as branded Viagra - at no additional cost to members. Sildenafil is indicated in adult men with erectile dysfunction, which is the inability to achieve or maintain a penile erection sufficient for satisfactory sexual performance. In order for sildenafil to be effective, sexual stimulation is required. Trademark Proprietor: Pfizer Products Inc., USA Licensed user: Pfizer Limited, India. VIAGRA is supplied as blue, film-coated, rounded-diamond-shaped tablets containing sildenafil citrate equivalent to 25 mg, 50 mg, or 100 mg of sildenafil. Tablets are debossed with PFIZER on one. VIAGRA (sildenafil citrate) is formulated as blue, film-coated rounded-diamond-shaped tablets equivalent to 25 mg, 50 mg and 100 mg of sildenafil for oral administration. Sildenafil ratiopharm 25 mg, 50 mg, 100 mg film-coated tablet is a generic medicinal product containing sildenafil as an active substance. The application was submitted under the Article 10(1) of Directive 2001/83/EC i.e. generic application referring to a reference medicinal product. VIAGRA - 100 mg Tablets (sildenafil citrate equivalent to 100 mg of sildenafil per tablet) are supplied as blue, rounded, diamond-shaped tablets marked ‘PFIZER’ on one side and 'VGR 100' on the other side, and supplied in blister pack 4 and 8 tablets.