Tadalafil stops the breakdown of a chemical responsible for relaxing muscles. Tadalafil is its active ingredient and is available as a generic drug. In BPH, the medication relaxes the urinary tract and bladder muscles, allowing for more effortless urine flow. Do not take more or less of it or take it more often than prescribed by your doctor. Other uses for this medicine This medication may be prescribed for other uses; ask your doctor or pharmacist for more information. Tadalafil does not prevent pregnancy or the spread of sexually transmitted diseases such as human immunodeficiency virus HIV.Cialis is used to treat erectile dysfunction (impotence) and symptoms of benign prostatic hypertrophy (enlarged prostate). Another brand of tadalafil is Adcirca, which is used to treat pulmonary arterial hypertension and improve exercise capacity in men and women. Do not take Cialis while also taking Adcirca, unless your doctor tells you to. How it works Uses Cialis and alcohol How to take Interactions Cost Pregnancy Breastfeeding Precautions Overdose Expiration Questions for your doctor About Cialis Cialis is a brand-name prescription drug. It’s approved by the Food and Drug Administration (FDA) to treat the conditions below in adult males.* Benign prostatic . Cialis form and strengths ( mg, 5 mg, 10 mg, 20 mg) Cialis comes as oral tablets that are available in four strengths: milligrams (mg), 5 mg, 10 mg, and 20 mg. Recommended dosage for.