Tadact 20 mg is a medication used to treat erectile dysfunction (ED) in men. It contains the active ingredient tadalafil, which is a phosphodiesterase type 5 (PDE5) inhibitor. Tadact 20 mg, similar to other PDE5 inhibitors like sildenafil (Viagra), vardenafil (Levitra), and other tadalafil-based medications, works by increasing blood flow to the penis, allowing for improved blood circulation and the ability to achieve and maintain an erection during sexual stimulation.