Tamsulosin hydrochloride extended-release tablets are one of the commonly used drugs in urology. They are selective alpha1 receptor blockers and are mainly used to treat prostatic hyperplasia and prostatitis. It can selectively block the α1 receptors on the urethra, bladder neck and prostate, which can relax the smooth muscle of urethra, bladder neck and prostate, thus improving the symptoms such as difficulty in urination caused by prostate enlargement. Secondly, it can also improve symptoms such as weakness in urination, incomplete urination and perineal discomfort due to prostatitis. In addition, it can relax the ureteral smooth muscle and reduce the pressure in the ureter, which can be used to treat stones in the lower ureter, promote stone removal and relieve pain. It is also often used clinically in patients who have retained ureteral stent tubes after urinary stone surgery to relieve the symptoms of frequent urination and hidden pain and discomfort in the lower back.