Which medication class is commonly used to treat urge incontinence?

Which medication class is commonly used to treat urge incontinence?

• A. Mirabegron
• B. Botulinum toxin in bladder wall
• C. Antimuscarinic
• D. Diuretics

Answer: (C)

Urge incontinence comes from detrusor overactivity when the bladder is filling, causing involuntary contractions and leakage. The main goal of treatment is to relax the detrusor during storage so the bladder can hold more urine and urgency-driven leaks decrease. Antimuscarinic drugs do exactly this by blocking muscarinic receptors (especially M3) on the detrusor muscle. With acetylcholine signaling reduced, involuntary contractions lessen, bladder capacity increases, and episodes of urgency and leakage decline. Common options include oxybutynin, tolterodine, solifenacin, and darifenacin. Side effects are important to consider: antimuscarinics often cause dry mouth, constipation, and blurred vision; in older adults, cognitive effects and urinary retention can occur. If antimuscarinics aren’t tolerated or effective enough, a beta-3 agonist like mirabegron is another widely used option, working by relaxing the detrusor to boost storage without blocking acetylcholine. Botulinum toxin injections into the bladder wall are typically reserved for refractory cases. Diuretics would worsen urge symptoms by increasing urine production, not help.

Urge incontinence comes from detrusor overactivity when the bladder is filling, causing involuntary contractions and leakage. The main goal of treatment is to relax the detrusor during storage so the bladder can hold more urine and urgency-driven leaks decrease. Antimuscarinic drugs do exactly this by blocking muscarinic receptors (especially M3) on the detrusor muscle. With acetylcholine signaling reduced, involuntary contractions lessen, bladder capacity increases, and episodes of urgency and leakage decline. Common options include oxybutynin, tolterodine, solifenacin, and darifenacin.

Side effects are important to consider: antimuscarinics often cause dry mouth, constipation, and blurred vision; in older adults, cognitive effects and urinary retention can occur. If antimuscarinics aren’t tolerated or effective enough, a beta-3 agonist like mirabegron is another widely used option, working by relaxing the detrusor to boost storage without blocking acetylcholine. Botulinum toxin injections into the bladder wall are typically reserved for refractory cases. Diuretics would worsen urge symptoms by increasing urine production, not help.