Cialis is taken as an oral tablet, either as a low dose daily medication or as a higher-dose “on-demand” medication. It is the brand name for tadalafil, a medication also .Pulmonary arterial hypertension can develop on its own or with other cardiovascular diseases, such as left heart disease LHD , sickle cell disease SCD and its variants, chronic obstructive pulmonary disease COPD and conditions such as pulmonary embolism PE. May make this condition worse. How does Cialis work? For oral dosage form tablets : For treatment of benign prostatic hyperplasia daily use : Adults—5 milligrams mg as a single dose, no more than once a day, taken at the same time each day. As with other PDE5 inhibitors, tadalafil has mild systemic vasodilatory properties that may result in transient decreases in blood pressure.tadalafil. erectile dysfunction (ED) benign prostatic hyperplasia, or BPH). Tadalafil (Cialis) is available both as brand-name and generic tablets. Common side effects of this medication include headache and indigestion. Tadalafil (Cialis) does interact with some medications. The dose of Cialis you need will depend on whether you’re taking it daily or as needed. Daily doses are often between and 5 milligrams (mg). The as-needed dose is usually 10 mg but can range from 5–20 mg. The typicaldose of Viagra is 50 mg. However, the dosage can range from 25– mg.  · Cialis; Descriptions. Tadalafil is used to treat men who have erectile dysfunction (also called sexual impotence). Tadalafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. The penis is one of the areas where .Like other ED medications, Cialis works by inhibiting the effects of an enzyme called PDE5, which is responsible for controlling the flow of blood to your penis. May increase your risk of bleeding. Cialis stays in your system for up to 36 hours and may provide support for erections during that entire time. There is a problem with information submitted for this request. In those patients who are stable on alpha-blocker therapy, PDE5 inhibitors should be initiated at the lowest recommended dose. Do not take other medicines unless they have been discussed with your doctor.