Overactive bladder (OAB) is a symptom complex of lower urinary tract symptoms of urgency, frequency with or without urinary incontinence. It is prevalent in both men and women (10.8% and 12.8% respectively). According to Irwin and colleagues (2006), women have a higher rate (13.1% vs 5.4%) of urinary incontinence (urgency, stress, or mixed), are more likely (19% vs 12%) to report frequency of more than eight times per day, and are more bothered by urinary frequency than men (66% vs 46%).