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Comprehensive and Detailed Explanation:

Drug transfer into human milk varies considerably depending on the medication's properties. Factors influencing transfer include molecular weight, lipid solubility, protein binding, ionization, half-life, and maternal plasma concentration. As a result, some medications enter milk in negligible amounts, while others may require closer evaluation.

IBCLCs should understand that medication counseling requires individualized assessment rather than broad assumptions. Most medications are not automatically incompatible with breastfeeding. Instead, healthcare professionals evaluate available evidence to determine whether breastfeeding can safely continue.

Maternal age alone does not determine drug transfer. Likewise, it is incorrect to assume that all medications transfer equally or that none enter milk. Accurate risk assessment helps families avoid unnecessary breastfeeding interruption while ensuring infant safety.

Knowledge of lactation pharmacology is an important component of IBCLC practice because medication concerns are a common reason families seek professional guidance.