Drug used in glaucoma is:
**Core Concept**
The question requires knowledge of pharmacological agents used in the management of glaucoma, a group of eye disorders characterized by increased intraocular pressure (IOP) leading to optic nerve damage and potential vision loss.
**Why the Correct Answer is Right**
Glaucoma is typically managed with medications that reduce IOP, either by increasing the outflow of aqueous humor or decreasing its production. One commonly used class of medications is beta-blockers, which act by decreasing the production of aqueous humor through inhibition of the beta-adrenergic receptors in the ciliary body. This leads to a decrease in IOP, thereby reducing the risk of optic nerve damage.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because prostaglandin analogs, while used in glaucoma, work by increasing the outflow of aqueous humor, not by decreasing its production.
**Option B:** This option is incorrect because alpha-2 agonists, such as brimonidine, decrease aqueous humor production but are not the primary choice for glaucoma management.
**Option C:** This option is incorrect because carbonic anhydrase inhibitors, such as acetazolamide, decrease aqueous humor production but are typically used as adjunctive therapy.
**Clinical Pearl / High-Yield Fact**
Beta-blockers, such as timolol, are a first-line treatment for glaucoma due to their efficacy in reducing IOP and their relatively favorable safety profile.
**Correct Answer: B. Alpha-2 agonists, such as brimonidine, decrease aqueous humor production but are not the primary choice for glaucoma management.**