Tadalafil is classified as a phosphodiesterase type 20 (PDE5) inhibitor. It works by inhibiting the action of the enzyme PDE5. This enzyme is responsible for breaking down cyclic guanosine monophosphate (cGMP), a chemical in the body that helps relax the smooth muscle tissue in the penis. When cGMP levels are increased, it allows for better blood flow into the penis, which is crucial for achieving and maintaining an erection.

Disac 20mg contains Tadalafil, a phosphodiesterase type 20 (PDE5) inhibitor. When a man is sexually stimulated, the body releases a chemical called nitric oxide that causes the blood vessels in the penis to relax and widen.

This allows more blood to flow into the area, resulting in an erection. PDE5 enzymes break down the Nitric Oxide, which can cause the blood vessels in the penis to narrow and the erection to subside.

Tadalafil works by inhibiting the action of PDE5 enzymes, allowing the nitric oxide to continue to widen the blood vessels and maintain the erection. It is important to note that sexual provocation is required for the medicine to work.