Which class of drugs primarily reduces aqueous production in glaucoma management?

• A. Carbonic anhydrase inhibitors
• B. Parasympathomimetics
• C. Beta blockers
• D. Prostaglandin analogs

Answer: (A)

Reducing aqueous production is a common approach when lowering intraocular pressure. Carbonic anhydrase in the ciliary body drives the formation of bicarbonate, which powers ion transport and fluid secretion into the eye. By inhibiting this enzyme, carbonic anhydrase inhibitors decrease bicarbonate availability, slow active ion transport, and therefore reduce the production of aqueous humor. This production-suppressing effect is the hallmark of this drug class and is why they are chosen when the goal is to lower aqueous formation directly. Other drug classes in glaucoma mainly work by increasing outflow rather than cutting production: prostaglandin analogs mainly boost uveoscleral outflow, parasympathomimetics increase outflow through the trabecular pathway, and beta blockers also reduce production but are not defined primarily by this mechanism in many exam contexts.