Vidalista 20 is a drug used to treat erectile dysfunction in males. It contains the active ingredient Tadalafil and works in the same way as other PDE 5 inhibitor drugs. It prevents the enzyme PDE 5 from destroying cGMP in the blood vessels which leads to an erection. This enables the blood to flow properly to the penis, and as the pressure increases, an erection is formed. It also helps men to become more engorged during sexual intercourse.