Tamsulosin hydrochloride acts on sympathetic α1 receptors on the urethra, bladder and prostate to relax their smooth muscles and can be used to treat dysuria caused by benign prostatic hyperplasia. Adverse reactions such as nausea, dizziness, vomiting, rash, abdominal pain, elevated ALT and LDH, nasal congestion, dysphagia, stomach upset, decreased blood pressure, and increased heart rate may occur after administration. Because a drop in blood pressure may occur after taking the drug, the drug should be closely monitored for changes in blood pressure when combined with antihypertensive drugs. It is contraindicated for those who are allergic to the drug, patients with renal insufficiency, children and female patients. Use with caution in patients with postural hypotension or coronary artery disease. If you need to use the drug patients, please under the guidance of the doctor strictly follow the instructions of the doctor to take medication, do not self-medication.