How Effective Is Cialis? Tadalafil comes as a tablet to take by mouth. BPH is caused by an enlarged prostate. Tadalafil is also used to treat men who have signs and symptoms of benign prostatic hyperplasia BPH. In trials of the drug, individuals taking Cialis saw a significant reduction in the frequency and urgency of urination and improved urine flow.In combination with sexual stimulation, tadalafil works by increasing blood flow to the penis to help a man get and keep an test1.rufil is also used to treat the symptoms of an enlarged. 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 prostate) which include difficulty urinating (hesitation, dribbling, weak stream, and incomplete bladder emptying), painful urination, and urinary frequency and.  · 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 .