Other uses for this medicine This medication may be prescribed for other uses; ask your doctor or pharmacist for more information. Tadalafil has been extensively studied for ED. Click here for an email preview. If you are taking tadalafil to treat erectile dysfunction, you should know that it does not cure erectile dysfunction or increase sexual desire. What special precautions should I follow?What is Cialis? Cialis relaxes muscles of the blood vessels and increases blood flow to particular areas of the body. Cialis is used to treat erectile dysfunction . Generic name: tadalafil [ ta-DAL-a-fil ] Brand names: Adcirca, Cialis. Drug classes: Agents for pulmonary hypertension, Impotence agents. Medically reviewed by .  · What is Cialis? Cialis is a brand-name prescription medication. It’s FDA-approved to treat the following in males:* erectile dysfunction (ED), a condition in which .