Megalis 20 mg is a medication containing the active ingredient Tadalafil, which is primarily used to treat erectile dysfunction (ED) in men. Tadalafil belongs to a class of medications called phosphodiesterase type 5 (PDE5) inhibitors, which work by increasing blood flow to the penis during sexual stimulation, thus helping men achieve and maintain an erection. https://www.genericday.com/megalis-20-mg.html