The combination therapy exhibited an obvious superiority over tamsulosin alone in improving IPSS ( 9.7 micro 3.0 vs 15.8 micro 3.3 ) , USPSS ( 8.1 micro 1.7 vs 12.3 micro 3.1 ) , Qmax ( [ 18.6 micro 2.3 ] ml/s vs [ 14.2 micro 2.3 ] ml/s ) , and OABSS ( 5.3 micro 1.3 vs 9.7 micro 2.7 ) ( P < 0.05 ) , but there were no obvious differences in residual urine , urine routine test results and adverse events between the two therapies ( P > 0.05 ) .