Which drug is NOT known to induce OCP?

• A. Epinephrine
• B. Latanoprost
• C. Timolol
• D. Pilocarpine

Answer: (B)

OCP refers to a reflex mechanism involving the eye that can affect heart rate through autonomic (vagal) pathways during ocular stimulation or medication use. Drugs that strongly influence parasympathetic tone in the eye or alter systemic autonomic balance can predispose to this reflex: pilocarpine directly stimulates muscarinic receptors in the eye, increasing vagal activity and potentially triggering the reflex; timolol, by blocking sympathetic input to the heart, can tilt the autonomic balance toward vagal dominance during ocular stimulation; epinephrine can also interact with autonomic responses during procedures, potentially affecting the reflex threshold. Latanoprost, on the other hand, acts locally to increase aqueous humor outflow with minimal systemic absorption and has little to no impact on autonomic tone, so it is not known to induce the oculocardiac reflex. Thus, latanoprost is the drug not associated with inducing OCP.