To minimize transfer of medications into breast milk, which practice is recommended?

• A. Dose medications immediately after feeding
• B. Time dosing to minimize peak levels
• C. Avoid all medications while breastfeeding
• D. Switch to herbal remedies

Answer: (B)

To minimize transfer into breast milk, the key is to manage how high the drug levels rise in the mother’s blood during times the infant feeds. Drug passage into milk increases with higher maternal plasma concentrations and tends to be greatest at the peak after dosing. Scheduling the dose so that the peak occurs when the infant is not nursing reduces how much drug appears in the milk during feeds. This is why timing the dose to minimize peak levels is the most reliable strategy.

In practice, this might mean taking the medication at a time that lets levels decline before the next feeding (for example, after a feeding), rather than spacing doses without regard to nursing times. Options that require avoiding all medications or rely on unproven herbal remedies don’t target this pharmacokinetic principle and aren’t as appropriate.