BPH occurs when the prostate and the surrounding tissues become enlarged. Other uses for this medicine This medication may be prescribed for other uses; ask your doctor or pharmacist for more information. Tadalafil is also used to treat men who have signs and symptoms of benign prostatic hyperplasia BPH. Talk to your doctor about which dosing schedule is right for you. This increased blood flow can cause an erection. Talk to your doctor about eating grapefruit and drinking grapefruit juice while taking this medicine. John’s wort.5 rows · Cialis (tadalafil) is an orally administered prescription medication used for erectile. 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 . 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 .