Tamsulosin belongs to the alpha 1 receptor blocking drug, by blocking the alpha 1 receptor, so that the prostate smooth muscle relaxation, urethral closure pressure is reduced, reduce the symptoms of the lower urinary tract, urinary flow, clinically used for the relief of Benign Prostatic Hyperplasia caused by urinary difficulties. The medication should be swallowed whole and not chewed. The use of the drug can lead to gastrointestinal discomfort, manifested as nausea and vomiting, loss of appetite, abdominal pain and discomfort, etc.; can lead to hepatic function impairment, generally can be recovered by stopping the drug; can also lead to rash, dizziness, staggering, palpitations, nasal congestion and other adverse reactions. Note that renal insufficiency and hypersensitivity to the product is prohibited. Special populations: children, pregnant and lactating women are prohibited. Patients should use the drug under the guidance of a professional physician, do not use the drug without authorization.