vilitra 40 (generic Viagra) is used to treat male impotence, sometimes referred to as erectile dysfunction. This happens when a man can't get or keep an erect, hard penis suitable for sexual activity. Women are not permitted to use vilitra 40 . Taking vilitra 40 will not improve your sex drive. vilitra functions by relaxing the blood vessels in your penis when you are sexually aroused. This allows blood to flow into your penis when you are sexually aroused, allowing you to naturally get an erection. vilitra only works when you are sexually stimulated.