Vidalista-40 is used to treat erectile dysfunction ED, impotence; and inability to get or keep an erection It is a class of medications called phosphodiesterase (PDE) inhibitors. It works to treat erectile dysfunction by increasing blood flow to the penis during sexual stimulation. This increased blood flow can cause an erection. If you are taking Vidalista-40 to treat erectile dysfunction, you should know that it does not cure erectile dysfunction or increase sexual desire.