What is the primary reason for applying pressure to the lacrimal punctum after eye drop administration?

The primary reason for applying pressure to the lacrimal punctum after administering eye drops is to reduce systemic absorption of the medication. This technique is particularly important when using medications that can have systemic effects, as some eye drops can drain into the nasal cavity and then enter the bloodstream if not properly managed. By placing pressure on the lacrimal punctum, you create a barrier that minimizes the amount of medication that can travel beyond the eye, thus decreasing the likelihood of systemic side effects and enhancing the local effect of the medication on the eye.

While other options may seem relevant, they do not address the primary concern. For instance, although applying pressure can help to prevent some drops from spilling, the main goal is to manage absorption rather than merely to control spillage. Enhancing a child’s cooperation or ensuring even distribution of the drops are secondary factors, but they do not encapsulate the primary pharmacological rationale behind this practice. The focus should always remain on ensuring that the medication remains local to its intended site of action while minimizing any unintended systemic effects.