Sildenafil citrate is a phosphodiesterase type 5 (PDE5) inhibitor. It works by inhibiting the enzyme PDE5, which regulates blood flow in the penis. By blocking PDE5, sildenafil allows for increased blood flow, which helps to produce and maintain an erection when sexually aroused.Kamagra 100 mg contains sildenafil citrate, which is a medication used to treat erectile dysfunction (ED) in men by increasing blood flow to the penis. This medication helps men achieve and maintain an erection sufficient for sexual activity. https://www.genericday.com/kamagra-100-mg.html