Tadalista 20 is a medication used to treat erectile dysfunction (ED) in men. It contains the active ingredient Tadalafil, which belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. Tadalafil works by relaxing the muscles in blood vessels and increasing blood flow to certain areas of the body, particularly the penis, which helps men achieve and maintain an erection during sexual stimulation.