To evaluate the efficacy and safety after 12 weeks oral administration of Imidafenacin 0.1mg b.i.d versus Fesoterodine 4mg once daily for the urge incontinence and/or increased urinary frequency associated with urgency as may occur in patients with overactive bladder.

Inclusion Criteria:

• Male and female patients with overactive bladder aged 20 years or more
• subject who had the continuos symptom for 3 months or more
• subject prepare a symptom diary and was deemed eligible for the study by the investigator
• 8 times or more of daily mean urination frequency
• 2 times or more of daily mean frequency of a sense of urinary urgency or 2 times or more of urge incontinence frequency

Exclusion Criteria:

• subjects with clinically significant stress urge incontinence, patients with urinary tract infections or relapsing urinary tract infections who had received treatment more than 4 times in the previous year
• subjects with diseases prohibiting anti-cholinergics from administration
• subjects who used an indwelling catheter or intermittent self intubation program, patients who had prostatic hyperplasia, prostatic cancer, bladder cancer,bladder stones, interstitial cystitis as complications
• subjects who received lower urinary tract surgery within 6 months
• subjects with a catheter placed or intermittent catheterization
• subjects who were deemed ineligible for the study by the investigator or sub-investigator, pregnant women, nursing women, and women who are planning pregnancy or have not used proper contraceptives during the study period
• subjects who are within 1 month after other clinical study was completed
• subjects having 100mL or more of residual urine
• subjects who had acute urinary retention history
• subjects who have been administered Prohibited concomitant medications