[RESULTS] In comparison with the baseline , both the monotherapy group and the combination therapy group showed significant decreased in the IPSS ( 16.50 + / - 4.27 vs 13.68 + / - 3.69 and 15.51 + / - 3.80 vs 11.49 + / - 2.75 ) , urine storage symptom score ( 10.48 + / - 2.75 vs 7.98 + / - 2.34 and 9.47 + / - 2.31 vs 5.74 + / - 1.66 ) , OABS ( 8.55 + / - 2.69 vs 6.32 + / - 1.97 and 8.21 + / - 2.55 vs 4.44 + / - 1.62 ) , urgent micturition score ( 4.25 + / - 1.06 vs 3.23 + / - 0.99 and 4.07 + / - 0.83 vs 2.26 + / - 1.05 ) , QOL ( 5.36 + / - 0.72 vs 3.43 + / - 0.66 and 5.07 + / - 0.86 vs 2.37 + / - 0.76 ) and PVR ( [ 44.55 + / - 22.39 ] vs [ 38.30 + / - 20.20 ] ml and [ 36.19 + / - 21.21 ] vs [ 24.98 + / - 17.60 ] ml ) ( P < 0.01 ) .