- male or female subjects 65 years of age or older
- OAB symptoms for at least 3 months
- score 3 or greater on Vulnerable Elderly Survey (VES-13)
- adequate mobility for independent toileting
- mean number of at least 2 UUI episodes per 24 hours
- mean urinary frequency of 8 or more micturitions per 24 hours
- able to independently complete the bladder diaries
- PVR urinary volume greater than 200 ml
- MMSE score less than 20
- greater than 15 UUI episodes per 24 hours
- creatinine clearance less than 30 ml/min
- an average resting heart rate of greater than or equal to 90 beats per minute