And if the overall appearance of a product matters to you, or you tend to feel a strong emotional attachment to a brand, then that might be a good enough reason to consider Cialis over Tadalafil. The bioequivalence between Tadalafil and Cialis also means that you should expect them to work best in the same circumstances. These medicines are called PDE5 inhibitors. This medicine also works best when you take it an hour before sex on an empty stomach. They include dutasteride Avodart, Jalyn and finasteride Propecia, Proscar.Tadalafil is in a class of drugs called phosphodiesterase-5 (PDE5) inhibitors and is available in a generic form often called generic Cialis. Tadalafil has been on the . Tadalafil (Cialis) is taken by mouth either as needed before sexual activity or once daily for erectile dysfunction (ED).It’s also taken once daily to treat symptoms from . Compare Drugs Print Comparing Cialis vs Tadalafil Cialis (tadalafil) Tadalafil Prescription only Cialis is used to treat erectile dysfunction (ED) and to reduce symptoms of benign .