Vidalista 20 is one such drug. Which is the best drug to solve the problem of impotence. Tadalafil acts as the active ingredient in Vidalista 20. Vidalista 20 is taken 1 hour before intercourse, after which the effect lasts for 4-5 hours. Take Vidalista 20mg as per the doctor's advice. By taking Vidalista 20, you can find a solution to the problem that occurs during your sex.