What is overactive bladder syndrome (OAB): A symptom syndrome of urgency +/- incontinence usually accompanied by urinary frequency and nocturia in the absence of pathological (e.g UTI, Stones, bladder cancer) and metabolic factors (e.g. diabetes)
Steps to manage Overactive Bladder (OAB) 
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Lifestyle changes (eliminate caffeinated drinks, stop smoking, reduce weight if obese)
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Bladder re-training and pelvic floor muscle exercises (both are effective in OAB)
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Pharmacotherapy (efficacy 50-75%)
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Intravesical injection of botulinum toxin A (efficacy 36-89%)
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Neuromodulation (50% cure)
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Clam cystoplasty (50%cure)
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Urinary diversion if all fails in severe cases