Cialis 10 Mg increases blood flow to the penis, and this enables a man to achieve an erection. It does not lead to sexual arousal. It should be used with caution, and only under medical supervision. Cialis is use for the treatment of erectile dysfunction (ED). It is also used to treat pulmonary arterial hypertension and benign prostatic hyperplasia, a condition in which the prostate gland becomes enlarged, causing problems with urination.