The full name of Tamsulosin is Tamsulosin Hydrochloride. Selodosin and Tamsulosin Hydrochloride are not the same, they are mainly different in the onset of action time of the drug, adverse reactions and drug interactions after the use of the drug. 1. Time of onset of action: 1 to 2h after the use of Selodosin, its blood concentration will reach the peak, the effect is faster; and tamsulosin absorbed into the blood, it will take 7 to 8h to reach the peak of blood concentration, the effect is slower. 2. Adverse reactions: Dizziness, insomnia, dry mouth, diarrhea, ejaculatory disorders, erectile dysfunction and other adverse reactions may occur after taking Xylodoxin; while tamsulosin hydrochloride may have nausea, vomiting, LDH elevation, blood pressure drop, heart rate acceleration and other adverse reactions. 3. Drug interactions: Serodosin should not be combined with strong cytochrome P450 3A4 inhibitors such as ketoconazole, and there are interactions with cyclosporine and erythromycin. Tamsulosin hydrochloride, on the other hand, interacts only when combined with antihypertensive drugs. Both cyclobenzaprine and tamsulosin hydrochloride act on alpha 1-adrenergic receptors in the lower urinary tract tissues to cause smooth muscle relaxation and may treat symptoms associated with BPH. Both drugs are contraindicated in those with the following conditions: hypersensitivity to the drug; renal insufficiency with CCr <30mL/min; children and female patients. Use these two drugs with caution in patients with moderate renal insufficiency and postural hypotension. In addition, tamsulosin hydrochloride should be used with caution in patients with coronary artery disease. If you need to use the above drugs, please strictly follow the doctor's instructions to take medication, do not self-medication.