Which of the following drug is not used in detrussor instability:
**Core Concept**
Detrusor instability, also known as overactive bladder, is a condition characterized by a sudden urge to urinate, which may be accompanied by urgency incontinence. The management of detrusor instability involves various pharmacological and non-pharmacological interventions.
**Why the Correct Answer is Right**
The management of detrusor instability involves the use of anticholinergics and beta-3 agonists. Anticholinergics, such as oxybutynin and tolterodine, work by blocking the action of acetylcholine at the muscarinic receptors in the bladder wall, thereby reducing the frequency of bladder contractions. Beta-3 agonists, such as mirabegron, work by stimulating the beta-3 adrenergic receptors in the bladder wall, which relaxes the detrusor muscle and increases bladder capacity.
**Why Each Wrong Option is Incorrect**
**Option A:** Oxybutynin is a well-established treatment for detrusor instability.
**Option B:** Tolterodine is another commonly used anticholinergic for managing detrusor instability.
**Option C:** Mirabegron is a beta-3 agonist used for the treatment of detrusor instability, making it not the correct answer.
**Clinical Pearl / High-Yield Fact**
It's essential to note that anticholinergics, such as oxybutynin, can have significant side effects, including dry mouth, constipation, and urinary retention, which may limit their use in certain patients.
**Correct Answer: C. Mirabegron is a beta-3 agonist used for the treatment of detrusor instability, making it not the correct answer.**