The main ingredient in the well-known drug Tadalis, which is used to treat erectile dysfunction in men, is tadalafil. Many men now think that using Tadalis will treat their erectile dysfunction. You can get Tadalis with a prescription.The drug's potency may cause you to have an erection that lasts longer than usual. With the help of Tadalis, men with erectile dysfunction (ED) may be able to get and maintain an erection. The FDA-approved drug Tadalis increases blood flow by relaxing blood vessels when taken.