An overactive bladder (OAB) is an idiopathic syndrome complex of urinary urgency with or without frequency (need to urinate more than 8 times/24 hours) and/or nocturia (more than 2 times/night). One third of patients also suffer from urge incontinence, which is an OAB symptom that has the most impact on the quality of life . The criteria are not standardised. The detrusor muscle shows hyperactivity and hypersensitivity. Urinary tract infection, prostatic hyperplasia and other obvious cause must be excluded. Mild symptoms may often be corrected by lifestyle changes, bladder training and pelvic floor exercises.