Vidalista 20 mg is a medication primarily used to treat erectile dysfunction (ED), also known as impotence, in men. The active ingredient in Vidalista 20 is tadalafil, which belongs to a class of medications called phosphodiesterase type 5 (PDE5) inhibitors. Tadalafil works by relaxing the muscles in the walls of blood vessels, particularly in the penis. This relaxation increases blood flow to the penis during sexual stimulation, leading to an erection. Vidalista 20 helps men achieve and maintain a firm erection when sexually aroused.