Patients with mixed urinary incontinence (MUI) are frequently treated with antimuscarinic therapy, despite little data being previously published for this patient group. We present a subgroup analysis of patients with overactive bladder syndrome, assessing the efficacy of once-daily solifenacin succinate in patients with MUI (n = 1041) or urge urinary incontinence (UUI; n = 1648) only. A greater proportion of patients receiving solifenacin achieved resolution of incontinence in both the MUI and UUI groups (MUI: 5 mg = 43%, 10 mg = 49%; UUI: 5 mg = 55%, 10 mg = 54%) compared with patients receiving placebo (MUI 33%, UUI 35%). Baseline to endpoint improvements in all other symptoms were statistically significant vs placebo for both solifenacin doses in both cohorts. The incidence of adverse events was comparable between the MUI and UUI cohorts. This analysis shows that once-daily solifenacin was as effective and well tolerated in patients with MUI as in patients with UUI.