BPH occurs when the prostate and the surrounding tissues become enlarged. Click here for an email preview. Both Cialis and Viagra work in this way. If you are taking tadalafil for erectile dysfunction, your doctor will probably start you on an average dose of tadalafil and increase or decrease your dose depending on your response to the medication. One of the first Cialis ads aired at the Super Bowl. Sexual activity may be a strain on your heart, especially if you have heart disease.How Cialis Works. Tadalafil and other PDE5 inhibitors primarily work by inducing muscle relaxation. Tadalafil stops the breakdown of a chemical responsible for relaxing muscles. In ED and PAH, the drug targets muscle cells in blood vessels. When the blood vessel muscle cells relax, this expands the vessel and increases blood flow; this . Cialis Prices, Coupons and Patient Assistance Programs. Cialis is a member of the impotence agents drug class and is commonly used for Benign Prostatic Hyperplasia, and Erectile Dysfunction. The cost for Cialis oral tablet mg is around $ for a supply of 30 tablets, depending on the pharmacy you visit. Cialis is a brand of tadalafil, one of the most popular medications to treat erectile dysfunction (ED).It was first approved in Cialis is popular because it offers dosing flexibility, works.