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Continuing drug therapy while breastfeeding. Part 2. Common misconceptions of physicians
Summary
Predicting drug safety for breastfeeding infants is crucial. Lithium levels in breast milk and infant blood can be measured to estimate infant exposure and monitor for adverse effects.
Area of Science:
- Pharmacology
- Neonatal Medicine
- Maternal Health
Background:
- Assessing the safety of maternal medications during breastfeeding is a clinical challenge.
- Lithium is prescribed for conditions like manic depression, and discontinuation may not be feasible for some mothers.
Observation:
- Breast milk drug transfer is often estimated by maternal dose per kilogram of infant weight.
- Infants may have a slower drug clearance rate than adults, potentially leading to higher circulating drug levels.
Findings:
- Measuring lithium in both maternal plasma and breast milk allows for estimation of the infant's drug dose.
- Monitoring infants for adverse effects is essential, with blood lithium level measurement indicated if concerns arise.
Implications:
- This approach provides a method for managing lithium therapy in breastfeeding mothers.
- It enables a more informed risk-benefit assessment for infant exposure to lithium via breast milk.