GSK1358820 is a botulinum neurotoxin A complex that has been approved for the treatment of overactive bladder (OAB) in several countries, however, it has not been approved for OAB treatment in Japan. This study has been planned to evaluate the efficacy and safety of GSK1358820 in Japanese OAB patients with urinary incontinence whose symptoms have not been adequately managed with other medications for OAB.