Tadalafil works on the PDE5 enzyme in the lungs to relax the blood vessels. See our source here What is Tadalafil? If you are taking tadalafil to treat PAH or BPH, follow your doctor’s directions and the guidelines in this paragraph. If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. Tadalafil is also used to treat men who have signs and symptoms of benign prostatic hyperplasia BPH. For further information contact your pharmacist or Eli Lilly and Company directly. If you ever need emergency medical treatment for a heart problem, the health care providers who treat you will need to know when you last took tadalafil.Cialis Daily is a 5mg tadalafil pill that you take every day. Because it’s a daily pill, it’s a lower dose than Cialis 10mg or Ciails 20mg which men take as needed. $2/pill with our mail order partner. Prices at Walgreens/CVS can be $18/pill. $ $ $ Lemonaid Mail Order. Yes – FREE delivery. No. No. No. Time to take effect. 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 . AdGet a Prescription for ED treatment, discreetly deliverED to your ive Offers · How It Works · Get More Info4/5 ( reviews).