Valif 20 mg is a medication used to treat erectile dysfunction (ED) in men. It contains Vardenafil, a phosphodiesterase type 5 (PDE5) inhibitor, which works by increasing blood flow to the penis during sexual stimulation, facilitating an erection. Vardenafil inhibits the PDE5 enzyme, which regulates blood flow in the penis. By blocking this enzyme, Valif enhances the effects of nitric oxide, a natural chemical the body produces to relax muscles in the penis and increase blood flow, leading to an erection when sexually stimulated.