We randomly divided @ patients with BPH and concomitant OAB into a mild obstruction symptom group ( n = @ ) and a moderate obstruction symptom group ( n = @ ) , @ of the former group treated with @ mg tamsulosin + @ mg solifenacin and the other @ with @ mg tamsulosin ; @ of the latter group treated with @ mg tamsulosin + @ mg solifenacin and the other @ with @ mg tamsulosin , all administered once daily for @ weeks .