Sildenafil citrate in Cenforce D helps men with erectile dysfunction and, in rare cases, hypertension. Sildenafil citrate (Cenforce D) is an oral medication that inhibits the PDE-5 enzyme. Triggers cGMP, a hormone that regulates sperm production by controlling blood flow to the male reproductive organ. You can buy Cenforce D online from our pharmacy with the best offers. Drugs containing nitrates or nitro-glycerine may interact negatively with sildenafil citrate and vice versa. Which works by dilating the blood vessels in the penile vein and increasing blood flow to the area? The duration of a man's penile erection during intercourse is about two to three hours. Drinking a glass of water 15 to 30 minutes before taking the tablet is necessary for the effectiveness of the drug; The tablet is a Belong PDE-5 inhibitor, which works by inhibiting the enzyme responsible for regulating blood flow in the veins; This, in turn, increases cGMP levels in the body, which in turn, increases blood flow, which in turn, improves erection.