Tadalafil under the name of Cialis is used to treat erectile dysfunction (impotence) and symptoms of benign prostatic hypertrophy (enlarged prostate). vidalista 20mg Tablet is a phosphodiesterase 5 (PDE5) inhibitor used for the treatment of impotence (ED), also known as the inability to get a hard erection, in men. Following sexual stimulation, Tadalafil 20mg works by helping the blood vessels in the penis to relax, allowing the flow of blood into the penis.