Terazosin hydrochloride is primarily used in the treatment of high blood pressure (hypertension) by relaxing blood vessels, allowing blood to flow more easily. It is also effective in managing symptoms of benign prostatic hyperplasia (BPH), such as difficulty urinating, by relaxing the muscles in the prostate and bladder neck. This dual action makes it a versatile medication for improving both cardiovascular and urinary health. It is typically administered orally and requires careful dosage adjustments to minimize side effects like dizziness or fatigue. Regular monitoring is recommended to ensure optimal therapeutic outcomes.