Levitra vardenafil : This medication is taken one hour before sex and can last up to 24 hours. An erection results from an increase in blood flow to the penis. While each PDE5 inhibitor differs slightly, they’re very similar in treating erectile dysfunction. If it is, the medication will be shipped to your house without the need for any face-to-face interaction. Cialis relaxes the bladder muscles, which allows you to urinate and with ease.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 . Generic: available in tablets of 5, 10, and 20 milligrams (mg), starting from $ Daily Generic: available in doses of and 5 mg at $8. Branded Cialis: available in doses of . AdComplete the Online Consultation with our Doctor. Personalize Your Needs. If Appropriate, Get a Prescription for ED from RexMD®. Free Shipping Available10K+ visitors in the past month.