Overactive Bladder

Medically reviewed by David Shusterman, MD · Updated September 16, 2026

Overactive bladder is a symptom pattern rather than a finding on a test: urgency that is difficult to defer, usually with frequency and waking at night, sometimes with leakage when the urge cannot be held. It affects men and women, becomes more common with age, and is one of the conditions people most often decide to live with — reorganising their routes, their travel and eventually their social life around the location of bathrooms.

First, the things that imitate it

Urgency has a long list of causes that are not an overactive detrusor muscle, and treating it as OAB before excluding them is the commonest error. A urinary tract infection produces exactly this picture and is excluded with a dipstick and culture. Blood in the urine — even a trace, even once — needs evaluating in its own right, because bladder cancer can present with irritative symptoms and nothing else. In men, an enlarged prostate causes storage symptoms through obstruction, and treating that bladder with an anticholinergic while leaving the obstruction alone can precipitate retention. In women, vaginal atrophy after menopause causes urgency that responds to local estrogen rather than to bladder drugs. Poorly controlled diabetes, diuretics, caffeine and alcohol all produce the same complaint.

Evaluation

Beyond the diary, the workup is a history including medications and fluid habits, an examination, a urinalysis and culture, and a post-void residual measured by bladder ultrasound to confirm the bladder is emptying. That last measurement is important before any drug that relaxes the bladder is prescribed. Where symptoms are severe, where treatment has failed, or where an obstruction is suspected, cystoscopy and urodynamics establish what the bladder is actually doing rather than what it is assumed to be doing.

Behavioural treatment is not a filler step

Fluid and caffeine adjustment, timed voiding, and bladder retraining — deliberately deferring the urge by small increments to rebuild capacity — produce results comparable to medication in trials, and they have no side effects. Pelvic floor training with urge suppression technique is effective and underused; done properly with a therapist it outperforms what patients teach themselves from a handout. Our pelvic floor rehabilitation service exists for this, and Emsella offers a non-invasive alternative for patients who struggle with a home programme. Weight loss improves urgency incontinence measurably in patients carrying excess weight.

Medication, and an honest word about anticholinergics

Two drug classes are available. Beta-3 agonists — mirabegron, vibegron — relax the bladder during filling and do not carry anticholinergic effects; they can raise blood pressure modestly and need monitoring. Anticholinergics — oxybutynin, tolterodine, solifenacin and others — are effective and cause dry mouth, constipation and, in older patients, cognitive effects.

The cognitive point deserves stating plainly rather than in a footnote. Cumulative anticholinergic exposure has been associated in large observational studies with an increased risk of dementia, with oxybutynin the worst offender for crossing into the brain. Association is not proof of cause, and the studies cannot exclude that early cognitive change leads to the prescribing rather than the reverse. But in an older patient the beta-3 agents avoid the question altogether, and that is a good enough reason to prefer them first. Where an anticholinergic is the right drug, we use the agents that penetrate the brain least and we review the patient's total anticholinergic burden across all their medications, which is frequently where the real exposure is hiding.

When drugs are not enough

Roughly a third to a half of patients stop bladder medication within a year, usually because the benefit did not justify the side effects. That is not the end of the line. Bladder Botox — onabotulinumtoxinA injected into the bladder wall during a short office cystoscopy — is highly effective, lasts six to nine months, and carries a real risk of needing to self-catheterise temporarily if the bladder becomes too relaxed. We quote that risk before the procedure because it is the thing patients most need to have consented to knowingly.

Percutaneous tibial nerve stimulation is a course of weekly office sessions using a fine needle at the ankle to modulate the nerves supplying the bladder. It is low-risk, drug-free, requires a commitment of time, and needs maintenance sessions to hold the benefit. Sacral neuromodulation — an implanted device — is the option for refractory cases, and we refer for it when the earlier steps have genuinely been exhausted.

The order we recommend

Exclude the imitators. Keep a diary. Treat behaviourally and address the pelvic floor. Add a beta-3 agonist before an anticholinergic, particularly over sixty. If drugs fail or are not tolerated, move to Botox or PTNS rather than cycling through a fourth tablet. Most patients who arrive frustrated have been stuck at step four for years.