The main purpose of this study is to assess the efficacy of TAC-302 for 12 weeks in detrusor underactivity patients with overactive bladder by measuring the following parameters of pressure-flow study.~Male; bladder contractility index (BCI)~Female; projected isovolumetric pressure (PIP) 1
The purpose of this study is to evaluate the efficacy and safety of TAC-302 in detrusor underactivity patients with overactive bladder.