Vidalista 20mg is a medication that contains tadalafil, a phosphodiesterase type 5 (PDE-5) inhibitor. Men who have trouble getting or keeping an erection usually take this drug. During sexual stimulation, tadalafil increases blood flow to the penis, helping men maintain strong erections. ED can be treated with Vidalista 20mg when taken as directed, but it is not designed to increase sexual endurance.