An effective prescription medication for erectile dysfunction, sometimes referred to as impotence, is Vidalista 40 mg. When dealing with such a disease, you should see your doctor. You can only obtain this medication from a pharmacy or purchase it online with a prescription from your doctor. Tadalafil is the main ingredient in the medication that treats erectile dysfunction, and it is a verified medication. Type 5 phosphodiesterase inhibitors include tadalafil.