Generic Viagra — is the first and the most well-known remedy for male erection. Its active ingredient is called Sildenafil. It provides enhanced blood flow to the male genital area. The cavernous body is relaxed, then is filled with blood abundantly, whereby an erection appears, sufficient to perform an act of intimacy. Sildenafil has no effect on the brain. An erection is achieved only if there is a natural sexual arousal.