Zenegra 100 mg is a medication used to treat erectile dysfunction (ED) in men. It contains Sildenafil Citrate, the same active ingredient found in Viagra. It works by improving blood flow to the penis, which helps men achieve and maintain an erection during sexual activity. Sildenafil Citrate, the active ingredient in Zenegra 100 mg, is a PDE5 inhibitor. It works by blocking the enzyme phosphodiesterase type 5 (PDE5), which normally restricts blood flow to the penis. https://www.genericday.com/zenegra-100-mg.html