Observational Study to Estimate the Dry Mouth in OAB Patients With Solifenacin

Inclusion Criteria: * 1\) male or female patients with 20 years of age or older 2) clinical history of OAB for at least 3 months prior to visit 2 3) more than 3 in total score and 2 in Q 3 index from OABSS questionnaire Exclusion Criteria: * 1\) In clinical trial, female with pregnant, intent to become pregnant or breast-feeding 2)post-voided residual urine volume \> 150ml 3) a history of catheterization due to acute urinary retention 4) a history of pelvic surgery within 6 months 5) 6) 7) a history of neurovascular disease such as Parkinson's disease, cerebral vascular disease, spinal injury or multiple sclerosis 8)patients with indwelling catheter or intermittent catheterization 9) active or recurrent (\>3 episodes per year) urinary tract infection 10) the use of the following medication at least 2 weeks * anticholinergics * Tricyclic antidepressants,anti-epilepsy drug, anti-Parkinson's disease drug, anti-arrythmia drug type I * Chlorpromazine, Thioridazine, Piperazine * MAO inhibitor 11) Patient is currently taking or has taken within the past 4 weeks alpha-blocker for the treatment of benign prostatic hypertrophy 12) Patient is currently taking or has taken within the past 8 weeks 5ARI or estrogen medication 13) Patient is currently using or has used medications with known activities as inhibitors or inducers of cytochrome P4503A4 (CYP3A4)