This medicine works best when you take it on an empty stomach an hour before sex. Who should not take Cialis? The table below summarizes the typical dosages for tadalafil: Indications of Tadalafil:. Your doctor will discuss the best treatment plan for you. A small number of patients taking Cialis also reported abnormal vision.In general, the brand name Cialis and generic version tadalafil work equally well. Typically, you would use the same dose of Cialis and tadalafil as they are the same medication. Practically speaking, the brand name and generic version work identically well in about 95 percent of men, provided the generic tadalafil is obtained from an FDA. We have good news for you: generic Cialis, used to treat erectile dysfunction (ED) and enlarged prostates, just hit pharmacies. Prices for the generic, . Here’s what you need to know about generic tadalafil and how to save. Cialis vs. generic tadalafil. Cialis and generic tadalafil are fundamentally the same medication, and the FDA has a rigorous process for ensuring that generics perform just like their brand counterparts. Both Cialis and tadalafil treat ED at the following doses: .