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Comprehensive and Detailed Explanation:

A medication's half-life refers to the time required for the concentration of the drug in the body to decrease by approximately half. Medications with shorter half-lives are generally eliminated more quickly from the maternal circulation, which may reduce the duration of infant exposure through breast milk.

However, half-life is only one factor considered during lactation risk assessment. Healthcare professionals also evaluate oral bioavailability, protein binding, milk-to-plasma ratio, infant age, infant health status, dosage, and frequency of administration. A short half-life does not automatically guarantee safety, nor does it prevent transfer into milk.

IBCLCs should understand basic pharmacokinetic principles because medication concerns are common during breastfeeding. Evidence-based evaluation helps support maternal treatment while minimizing unnecessary interruption of breastfeeding.