What is a common safety precaution when using multiple ocular hypotensive medications?

• A. Space drops by at least 5 minutes and monitor for systemic hypotension or bradycardia.
• B. Use all drops at the same time.
• C. Increase dose of each.
• D. Take with a meal.

Answer: (A)

When more than one ocular hypotensive is prescribed, spacing each drop by several minutes allows the first drop to be absorbed and reduces the chance that the second drop will wash it out or increase systemic exposure. This helps minimize systemic side effects, such as low blood pressure or a slow heart rate, which can occur with some medications (especially topical beta-blockers) through absorption via the nasolacrimal drainage. Practically, wait at least a few minutes between drops and consider closing the eye gently and applying light pressure to the inner corner for 1–2 minutes after instillation to lessen systemic absorption. Taking drops with a meal isn’t relevant, and increasing the dose or instilling all drops at once can raise the risk of adverse effects and poor tolerability.