Used primarily in the treatment of benign prostatic hyperplasia (BPH), it helps improve urinary flow by relaxing smooth muscle in the prostate and bladder neck. Its selective antagonism of alpha-1D adrenergic receptors makes it effective in reducing symptoms like urgency, frequency, and incomplete bladder emptying. It may also have beneficial effects on lower urinary tract symptoms with fewer side effects related to blood pressure compared to non-selective alpha blockers.