Indications for using itrin tablets and benefits for women and men. itrin tablets are used to treat prostate enlargement and high blood pressure. It works to dilate the blood vessels and arteries so that blood can pass easily. It contains the substance terazosin, which works to inhibit alpha in different areas of the body. It also works to relax the smooth muscles in the bladder and prostate, which facilitates the process of urination. Ingredients of itrin tablets itrin tablets contain 2 milligrams of the active ingredient terazosin hydrochloride, which belongs to the family of calcium channel inhibitors.