The active ingredient in ZENEGRA is Sildenafil Citrate. Sildenafil is used a treatment for men experiencing erectile dysfunction (difficulty maintaining an erection). Sildenafil's mission is to work on enzymes of the body called phosphodiesterases and to improve a man's response to sexual stimulation. These enzymes work mainly in the penis, so the action of sildenafil citrate is primarily limited to the penis.
Sildenafil works to control the enzyme, and by doing so regulates the blood flow out of the penis and thereby helping the patient maintain an erection.
Sildenafil citrate improves the erection of most men, regardless of how long they have had ED. So the time spent with one's partner can be sexually active and arousing.
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