Each individual is different, but now you can be sure that Tadalafil and Cialis are medical equivalents. The table below summarizes the typical dosages for tadalafil: Indications of Tadalafil:. Without physical action to the penis, such as that occurring during sexual intercourse, tadalafil will not work to cause an erection. It also has the most variable possible dosage, making it quite a versatile treatment. One of these is PAH. Tadalafil and Cialis have identical results in clinical trials for their effectiveness. How Effective Is Cialis?Tadalafil is a prescription medication used to treat benign prostatic hyperplasia, erectile dysfunction, and pulmonary arterial hypertension. The 3 Best Premature Ejaculation (PE) Pills and. Drug Class PDE-5 inhibitor Controlled Substance Classification Not a controlled medication Generic Status No lower-cost generic available Availability . Tadalafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). Your doctor will determine which is the best way for you to take tadalafil. Follow your doctor.