Megalis 20 mg is a medication used to treat erectile dysfunction (ED) in men. It contains Tadalafil as its active ingredient, which belongs to a class of medications known as phosphodiesterase type 5 (PDE5) inhibitors. Tadalafil works by inhibiting the enzyme phosphodiesterase type 5, which is responsible for the degradation of cyclic guanosine monophosphate (cGMP). cGMP is a chemical messenger that helps relax smooth muscles in the blood vessels of the penis, allowing for increased blood flow when sexually stimulated. This increased blood flow leads to an erection, enabling sexual activity. https://www.genericday.com/megalis-20-mg.html