Do not take a double dose or more than one dose per day to make up for a missed one. Cialis is a brand-name prescription medication. Tell your doctor if any of these symptoms are severe or do not go away: headache. Men with BPH usually have difficulty urinating, a decreased flow of urination, hesitation at the beginning of urination, and a need to get up at night to urinate. Tadalafil comes as a tablet to take by mouth. Click here for an email preview. You should only be treated with one of these products at a time.Cialis is a medication approved by the Food and Drug Administration (FDA) often used to treat erectile dysfunction (ED) and benign prostatic hyperplasia (BPH) in . 1. How it works Cialis is a brand (trade) name for tadalafil which may be used to treat erectile dysfunction (ED) and benign prostatic hyperplasia (BPH). Cialis . Tadalafil (Cialis) is used to treat erectile dysfunction (ED, impotence; inability to get or keep an erection), and the symptoms of benign prostatic hyperplasia (BPH; an enlarged .