Which pharmacologic category includes pilocarpine-based presbyopia treatments?

• A. Beta-blockers
• B. Prostaglandin analogs
• C. Carbonic anhydrase inhibitors
• D. Cholinergic agonists

Answer: (D)

Pilocarpine-based presbyopia treatments work by activating the eye’s cholinergic system. Pilocarpine is a muscarinic receptor agonist, meaning it directly stimulates the parasympathetic (cholinergic) pathways in the eye. This leads to pupil constriction (miotic effect) and contraction of the ciliary muscle, which increases depth of field and can modestly influence accommodation to aid near vision. That’s why the correct category is cholinergic agonists (parasympathomimetics).

The other drug classes don’t activate muscarinic receptors or produce the same pupil and ciliary muscle effects: beta-blockers reduce aqueous humor production, prostaglandin analogs alter outflow through a different pathway, and carbonic anhydrase inhibitors lower aqueous humor production via another mechanism.