Null hypothesis of the trial is that there is no difference between solifenacin and oxybutynin with respect to efficacy, side effects, patient satisfaction and quality of life measures in patients with overactive bladder.

In this two-month follow-up study, the patients with overactive bladder will be randomly assigned into two groups (solifenacin or oxybutynin in their usual doses) and will be assessed with respect to baseline characteristics and complaints before treatment. After initiation of the treatment at first and second months follow-up visits the patients will be reassessed with respect to compliance, satisfaction, degree of improvement, reasons for dropouts, number and severity of side effects.

Inclusion Criteria: Women between 18-70 years of age, diagnosed to have overactive bladder (presence of at least two of the following three main criteria: urgency, urge incontinence, frequency and nocturia)

Exclusion Criteria: Presence of stress urinary incontinence, patients who are still using a drug for overactive bladder, pregnant women, women in postpartum period (women on lactation), patients who have closed angle glaucoma, patients with chronic constipation, having allergy to the ingredients of the drugs, patients having the contraindicated conditions listed in the printed instructions of the drugs.

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