Tamsulosin should be taken after meals, because postprandial administration can reduce the stimulation of the drug to the gastrointestinal tract, but also slow down the excretion of the drug and promote the absorption of the drug. Tamsulosin is a selective α1-adrenergic receptor blocker, with the effect of relaxing the smooth muscle of the prostate, clinically used for prostatic hyperplasia-induced urinary difficulties. The administration of this product can lead to dizziness and disorientation, loss of consciousness, decrease in blood pressure, accelerated heart rate, postural hypotension, itchy skin rash, urticaria, nausea and vomiting, abdominal pain and diarrhea, impaired liver function, abnormal erection of the penis, blurred vision and other adverse reactions. Note that it is contraindicated for those who are allergic to the product. Use with caution in patients with renal insufficiency, postural hypotension, and severe hepatic impairment. Because this product can cause vertigo, it is not advisable to drive, maneuver machinery or perform dangerous operations while taking the drug. Special Population: The safety of the drug for pregnant and lactating women is not clear, and it should be prohibited for children. Patients should use the drug under the guidance of a medical professional and strictly follow the doctor’s instructions.