Intagra 100 is composed of Sildenafil Citrate. This parent component in the medicine belongs to a group of medications called phosphodiesterase type 5 inhibitors. Commonly the medication is used for treating ED (impotence). Sildenafil Citrate affects the repose of sexual arousal. Using a chemical known as nitric oxide it boosts up the smooth muscle relation that allows enhancing the flow of blood in the penile region for achieving and sustaining stiffer penile.