The overactive bladder (OAB; in German "Reizblase") is a symptom picture in which the bladder is overactive and contracts even when it is only slightly full. Those affected feel a sudden, strong urge to urinate that can barely be held back, or not at all. This can occur with or without involuntary loss of urine (urge incontinence).¹
An overactive bladder is widespread but is often kept quiet out of embarrassment. It can considerably impair quality of life: social withdrawal, sleep disturbance from night-time urge to urinate (nocturia), anxiety about public situations.¹,²
An overactive bladder is very treatable
The first-line treatment is non-pharmacological — behaviour changes, pelvic floor training and bladder training are often effective. Medications come only when these measures are not enough.
2. Symptoms
Sudden, strong urge to urinate (urgency) — the key symptom; comes on by surprise, can barely be put off
Frequent urination (urinary frequency) — usually more than eight times a day
Night-time urge to urinate (nocturia) — having to wake one or more times per night
Urge incontinence — involuntary loss of urine with a strong urge; does not occur in everyone affected
Small amounts of urine per toilet visit
The symptoms can considerably impair everyday life: those affected know the location of every public toilet, avoid travel, drink less and cut back on social activities.
3. Causes
The exact cause of an overactive bladder is often not clearly identifiable. Several factors can play a role.¹
Overactivity of the bladder muscle (detrusor): the bladder muscle contracts in an uncontrolled way even though the bladder is not yet full.
Age: the frequency rises with age — changes in the bladder musculature and the nerve supply play a role.
Neurological conditions: multiple sclerosis, Parkinson's, stroke, spinal cord injuries can cause an overactive bladder (neurogenic detrusor overactivity).
Enlarged prostate: in men, a benign enlarged prostate can cause similar symptoms.
Urinary tract infections: must be ruled out — a bladder infection can cause similar symptoms.
Pelvic floor weakness: can contribute to urge incontinence.
Medications and drinks: caffeine, alcohol and certain medications (e.g. diuretics) can intensify the symptoms.
4. Diagnosis
The overactive bladder is a clinical diagnosis made after ruling out other causes.¹
Voiding diary (bladder diary): over a few days, note the amount you drink, toilet visits, urine volumes and urgency episodes. One of the most important diagnostic tools.
Urine test: ruling out a urinary tract infection (dipstick, and if needed a urine culture).
Post-void residual measurement: ultrasound after urinating — rules out a relevant emptying disorder.
Physical examination: assessment of the pelvic floor, and in men a rectal examination (prostate).
Urodynamics: a special bladder pressure measurement. Usually only considered when first-line treatment does not work or a neurological cause is suspected.
The non-pharmacological treatment is the recommended first-line approach — it is effective, free of side effects, and should always be tried before medications are used.¹
First lineBehaviour change & training
Bladder training
Deliberately putting off toilet visits in order to gradually increase bladder capacity. Goal: to lengthen the intervals between toilet visits. Requires patience and consistency.
Pelvic floor training
Strengthening the pelvic floor muscles can reduce urge incontinence and the urge to urinate. Physiotherapy with biofeedback can improve the learning effect. Works in women and men.
Adjust drinking habits
Drink enough (not too little!), but reduce the amount you drink in the evening (nocturia). Caffeine and alcohol can intensify the symptoms.
Weight control
Obesity can worsen bladder symptoms. Weight reduction can help.
Don't drink less!
Many of those affected reduce how much they drink out of fear of the urge to urinate — but this can worsen the symptoms: concentrated urine irritates the bladder even more. Drink enough (usually one and a half to two litres a day), but reduce it in the evening.
6. Treatment: medications
When behaviour changes and training alone are not enough, medications can be used in addition.¹
Second lineMedication therapy
Antimuscarinics (anticholinergics)
Trospium chloride, solifenacin, darifenacin, fesoterodine, oxybutynin — they inhibit the overactive bladder contractions. Common side effects: dry mouth, constipation. In older people, cognitive side effects can occur — especially with oxybutynin. Trospium chloride crosses the blood-brain barrier less and is often preferred in older patients.
Mirabegron (beta-3 agonist)
A newer agent that relaxes the bladder muscle via a different mechanism. Less dry mouth than antimuscarinics. Can also be combined with antimuscarinics.
Vaginal oestrogen
In women who are going through the menopause, local oestrogen (cream, pessary, ring) can improve bladder symptoms.
Anticholinergics in older people
Antimuscarinics can promote confusion, memory problems and falls in older patients. Caution is needed with pre-existing cognitive impairment — trospium chloride or mirabegron can be alternatives.
If the first-line therapies fail, there are further options.¹
ReserveFor a treatment-resistant overactive bladder
Botulinum toxin (Botox) into the bladder wall
Injected into the bladder muscle via cystoscopy. Can considerably reduce the urge to urinate for several months. Usually has to be repeated every six to twelve months. Risk: temporary difficulty emptying the bladder.
Sacral neuromodulation (bladder pacemaker)
A small stimulator is implanted under the skin and modulates the nerves that control the bladder. For treatment-resistant cases.
Tibial nerve stimulation
Non-invasive or minimally invasive stimulation of the tibial nerve at the ankle. Can improve bladder function.
8. Everyday life with an overactive bladder
Don't drink less: many of those affected reduce how much they drink out of fear of the urge to urinate — but this can worsen the symptoms (concentrated urine irritates the bladder). Drink enough, but reduce it in the evening.
Caffeine and alcohol: can intensify the symptoms. Test individually whether reducing them helps.
Toilet habits: don't go to the toilet "just in case" (this trains the bladder to a smaller capacity). Do bladder training consistently.
Overcoming embarrassment: an overactive bladder is extremely common and is no reason for shame. An open conversation with the practice is the first step.
Aids: pads or incontinence products can increase your sense of security in everyday life — but they are no substitute for treatment.
How brite helps you with an overactive bladder
Antimuscarinics in the morning, mirabegron once a day, vaginal oestrogen a few times a week — plus bladder training with a voiding diary. The treatment only works if it runs consistently. brite helps you keep the routine.
Medication reminder — trospium chloride or solifenacin in the morning, mirabegron once a day, vaginal oestrogen on schedule, pelvic floor exercise sessions as a routine: brite reminds you on time. Set up a reminder
Interaction check — anticholinergics add up (antidepressants, sleeping pills, antihistamines and overactive-bladder medications can dangerously increase the anticholinergic burden — especially in older people). brite shows the critical combinations. Check now
Health history — document urgency episodes, toilet visits, getting up at night (nocturia), how much you drink and pelvic floor training over time — essentially a digital voiding diary that makes diagnosis and treatment adjustment easier at the urology practice. Track your history
Digital medication plan — all your medications clearly laid out for urology, gynaecology and your family doctor. Especially important in older people: make the anticholinergic burden visible, avoid falls and confusion. Go to medication plan
A bladder infection is a bacterial infection with burning when urinating — it is acute and curable. The overactive bladder is a functional disorder without infection: a sudden urge to urinate and frequent urination without detectable bacteria. The urine test is unremarkable with an overactive bladder.
Yes — pelvic floor training is part of the first-line treatment of an overactive bladder and is effective when done consistently. Guided training with physiotherapy and biofeedback is often more effective than practising on your own.¹
The deliberate putting off of toilet visits in order to gradually get the bladder used to larger filling volumes. Goal: longer intervals between toilet visits. It requires patience — improvement usually appears after weeks.
No — drinking too little can worsen the symptoms, because concentrated urine irritates the bladder. Drink enough (usually one and a half to two litres a day), but reduce the amount in the evening. Test caffeine and alcohol individually.
Yes — antimuscarinics and mirabegron can reduce the urge to urinate. They are usually used in addition to behaviour changes and training, not as the sole therapy. Side effects (dry mouth, constipation) should be discussed.¹
Botulinum toxin is injected into the bladder muscle via cystoscopy and can considerably reduce the overactive urge to urinate for several months. It is usually considered when medications and training are not enough. It has to be repeated regularly.
No — men can also have an overactive bladder. In men, however, other causes (especially benign enlargement of the prostate) must be ruled out, as they can cause similar symptoms.
When the urge to urinate impairs everyday life, sleep quality suffers, involuntary loss of urine occurs or social activities become restricted. An overactive bladder is very treatable — the sooner treatment begins, the better.
Medical disclaimer: This article is for general information and does not replace medical advice, diagnosis or treatment. Overactive-bladder medications (especially anticholinergics) can have interactions and side effects and should be taken only in consultation with the treating practice. Last updated: April 2026.
