The main purpose of the drug Vidalista 20 is to treat male erectile dysfunction (ED). Tadalafil , a phosphodiesterase type 5 (PDE5) inhibitor that increases blood flow to the penis and makes erections easier when sexually stimulated, is present in large doses (20 mg). The purpose of Vidalista 20 is to assist men in obtaining and sustaining an erection during intercourse. It functions by causing the penis' blood arteries to relax, increasing blood flow.