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BPH was diagnosed based on International Prostate Symptom Score (IPSS), ultrasonographic observation, and objective findings. The inclusion criteria were as follows: IPSS ��8 points; QOL score?��?3 points; prostate volume measured by ultrasonographic method?��?20?mL; void volume?��? 100?mL; and maximal urinary flow rate (Qmax)? http://www.selleckchem.com/products/ganetespib-sta-9090.html patients who were taking vardenafil hydrochloride hydrate; and patients otherwise judged by an attending physician to be inappropriate. Patients who had previously taken any ��1-blocker for the treatment of BPH but had not taken it during the 2-month period before the study were included. After obtaining informed consent, the patients were randomly divided into two groups: the silodosin-preceding group or the tamsulosin-preceding group. Patients in the silodosin-preceding group were administered silodosin at 8?mg/day (4?mg/dose, twice daily) for 4?weeks, followed by 4?weeks' administration of tamsulosin http://www.selleck.cn/products/cobimetinib-gdc-0973-rg7420.html at 0.2?mg/day (0.2?mg/dose, once daily). Patients in the tamsulosin-preceding group were administered tamsulosin at 0.2?mg/day (0.2?mg/dose, once daily) for 4?weeks, followed by 4?weeks' administration of silodosin at 8?mg/day (4?mg/dose, twice daily). In this study, considering the half-life of each drug (silodosin: about 10?h;14 tamsulosin: about 12?h15) and the benefits of treatment in patients, no drug withdrawal period was provided when the drug was changed, and drugs were thus continuously administered for a total of 8?weeks. The following three populations were to be considered in the statistical analysis: Intention-to-treat (ITT) population: http://www.selleckchem.com/products/poziotinib-hm781-36b.html The ITT population consisted of all randomized patients who took at least one medication. Efficacy-evaluable (per protocol [PP]) population: The PP population was a subset of the ITT population in which IPSS was measured at all the prescribed points (before administration and after 4 and 8?weeks of administration) and there were no major protocol violations. This was the primary population for all efficacy analyses. Safety population: The safety population consisted of all randomized patients who had taken at least one medication. Demographic parameters and all efficacy variables were to be analyzed in the PP population. The primary end-point of evaluation for efficacy was the change in total IPSS from baseline; secondary end-points were changes in objective parameters (Qmax, residual urinary volume, blood pressure, and heart rate) and evaluation of subjective symptoms, for example, IPSS voiding and storage subscores and QOL score. The symptom scores were measured before administration of the drug and 1, 2, 4, 6 and 8?weeks after initiation of administration (the objective parameters were measured before administration and 4 and 8?weeks after initiation of administration).