Alfuzosin (al FYOO zoe sin) is used to treat benign prostatic hyperplasia (BPH) in men. This is a condition that causes you to have an enlarged prostate. This medicine relaxes the muscles in the prostate and the bladder which reduces symptoms and improves urine flow. This medicine is not for use in women. This medicine may be used for other purposes; ask your health care provider or pharmacist if you have questions.