Vidalista 20 contains tadalafil, which is a proven PDE-5 inhibitor. It relaxes the muscles and blood vessels in the body, allowing more blood to flow to specific areas of the body. Vidalista 10 is a popular alternative to generic Cialis and works the same way by helping to achieve and sustain an erection. It is also used to treat the symptoms of benign prostatic hyperplasia (BPH), a condition in which the prostate gland becomes enlarged and causes difficulty with urination.