Zenegra is the generic Viagra that is an effective treatment for male impotence regardless of the cause or duration of the problem or the age of the patient. Sildenafil Citrate is the active ingredient of this drug used to treat impotence in men. It can help men who have impotence get and sustain the stiffness when they are excited to make love. It is made with through reverse engineering for the Sildenafil molecule - a totally different process of making Sildenafil and its reaction. That is why it has effect in 15 minutes compared to others that takes 45 to 50 minutes to show the effect. Whatever may be your age single pill is enough to treat impotence.