Harle is an alpha-adrenergic receptor blocker, the main action of which is to treat prostatic hyperplasia in elderly men. The main mechanism of action is to effectively reduce the smooth muscle tone of the bladder neck and prostate, reduce urethral resistance and improve urinary function. For patients with mild symptoms and small prostate enlargement volume, it has good effect. It is recommended to take 1 tablet orally every night before bedtime to effectively improve the frequency of urination, increased nighttime urination, straining to urinate, waiting for urination, and thinning of the urine line in patients with prostatic hyperplasia. The slight side effects of Halo are dizziness, nasal congestion, postural hypotension, and the overall effect is very safe.