Kamagra 100mg contains an active component known as sildenafil citrate. Sildenafil inhibits an enzyme responsible for the consistency of blood flow to the genital area in men. When the action of these enzymes is suppressed, blood flow to the genital area is restored. This allows an erection for a significant period of time. Sildenafil citrate has been a proven method of treating not only erectile dysfunction but also pulmonary arterial hypertension. Of course, sildenafil citrate is not the only known remedy for erectile dysfunction.