Vidalista 20 contains the active ingredient Tadalafil, which is a type of medication known as a phosphodiesterase type 5 (PDE5) inhibitor. It works by relaxing the smooth muscles in the walls of the blood vessels in the penis, allowing for increased blood flow to the area. This increased blood flow leads to an erection that is firm enough for sexual intercourse.

Normally, when a man is sexually stimulated, the nerves in the penis release a chemical called nitric oxide. Nitric oxide stimulates an enzyme called guanylate cyclase, which in turn increases levels of a chemical called cyclic guanosine monophosphate (cGMP). cGMP causes the smooth muscles in the penis to relax, allowing blood to flow in and causing an erection.

However, in men with erectile dysfunction, the levels of cGMP are reduced due to the action of an enzyme called phosphodiesterase type 5 (PDE5). PDE5 breaks down cGMP, leading to a loss of the ability to achieve or maintain an erection.

By inhibiting the action of PDE5, Vidalista 20 helps to increase the levels of cGMP in the penis, leading to improved blood flow and a firmer, more sustained erection. It is important to note that Vidalista 20 only works in the presence of sexual stimulation, and will not cause an erection on its own.