IBCLC Practice Exam 2026 – Complete Preparation Guide

The correct answer pertains to the classification system used to evaluate the safety of medications during lactation. In this system, medications are divided into levels based on the amount of published data regarding their use during breastfeeding.

A medication that has no published data but is nonetheless considered safe falls into the third category, which is L3. This category is designated for drugs that are usually compatible with breastfeeding based on limited data or expert opinion, suggesting they pose some risk but not enough to warrant avoidance. The classification acknowledges the lack of extensive research while still providing reassurance about the medication's use during lactation.

In contrast, categories L1 and L2 are characterized by significant evidence supporting safe use during breastfeeding, while L4 is reserved for medications that are contraindicated due to significant risks to the breastfeeding infant. By placing a medication in category L3, healthcare providers can make informed decisions that balance safety for both mother and child in the absence of extensive data.