What is overactive bladder?

Overactive bladder (OAB) is a common condition involving sudden urgent need to urinate (urgency), often with frequency (needing to urinate often during the day) and nocturia (needing to urinate during the night). Some people with OAB have leakage of urine when urgency hits (urge urinary incontinence). OAB is common, affecting roughly 15 to 20 percent of adults, and becomes more common with age. Despite how common and treatable it is, many people live with OAB for years without seeking care because of embarrassment or because they assume it is just part of getting older.

Why it happens. The bladder muscle (the detrusor) normally relaxes as the bladder fills and contracts when you decide to urinate. In OAB, the bladder muscle becomes overactive and contracts at smaller volumes, producing the urge feeling. Multiple factors can contribute, including age-related changes, weakened pelvic floor muscles, neurological conditions, and sometimes medications.

The initial approach. Lifestyle and behavioural changes are the foundation. Bladder training (gradually extending the time between trips to the bathroom), managing fluid intake (especially caffeine and alcohol), weight reduction in selected patients, and pelvic floor physiotherapy all contribute. These are often paired with medication for better results.

The medication options.

Antimuscarinic medicines: this older class includes oxybutynin, tolterodine, solifenacin, darifenacin, fesoterodine, and trospium. They reduce overactive bladder muscle contractions and are effective. The main downsides are side effects from blocking acetylcholine receptors throughout the body: dry mouth, constipation, sometimes cognitive effects (a particular concern in older adults).

Beta-3 agonist medicines: mirabegron and vibegron work through a different mechanism, relaxing the bladder muscle by activating beta-3 receptors. They are generally well-tolerated and avoid the anticholinergic side effects, which makes them an increasingly preferred option, particularly in older adults. Vibegron has growing real-world experience supporting its profile.

Combination: for patients who do not respond enough to one medicine, combining an antimuscarinic with a beta-3 agonist often improves results.

The procedural options for refractory OAB.

Intravesical onabotulinumtoxinA injection: a series of small botulinum toxin injections into the bladder wall (done in an office setting). Highly effective for refractory urgency urinary incontinence. The effect lasts about 6 to 9 months and treatment is repeated.

Neuromodulation: percutaneous tibial nerve stimulation (PTNS, either weekly office-based or with an implanted device) and sacral neuromodulation (Interstim, an implanted device that stimulates sacral nerves) are options for selected patients with refractory OAB.

When to seek care. Not having to live with bothersome urinary symptoms is the most important thing. If urgency, frequency, or leakage is interfering with your life, the modern range of behavioural, pharmacological, and procedural options means that meaningful improvement is achievable for nearly everyone. The conversation often starts with a primary care or gynaecology visit, with referral to urogynaecology or urology for procedural options if needed.