You can buy it from a store-based pharmacy or reputable online pharmacy with a prescription. Take both tablets one after the other. Subsequently, the FDA approved both vardenafil [27] and tadalafil in Side Effects What are the side effects of Cialis Tadalafil? It belongs to the drug class known as PDE5 inhibitors.Find the best tadalafil or cialis prices near you now with our cost comparison tool and start saving today. (Generic for CIALIS) QTY 30 • 5 MG • Tablet • Near EDIT; Add to . Tadalafil is a medicine used to treat erectile dysfunction (ED, also called impotence) and problems with urination caused by an enlarged prostate (benign prostatic hypertrophy or BPH). It is sometimes known by its generic name tadalafil, and sometimes known by its trade name, Cialis. There are also other brands of this medicine available. Here are answers to some frequently asked questions about drug cost and Cialis. What’s the cost per pill of Cialis 20 mg? How does this compare with the cost of other strengths ( mg, 5 mg,