Each malegra 100 tablet contains an active ingredient called sildenafil citrate. Sildenafil citrate is used to treat male sexual dysfunction (ED). In combination with sexual arousal, sildenafil citrate works by enhancing the circulatory system in the penis and empowering men for erection and maintenance. With the help of this medicine, many men can get rid of their sexual problems very quickly. So you have proved to be very useful in treating your sexual problem.