Lactation Safety Checker (Hale L1-L5)

Assesses medication safety during breastfeeding using Hale's Lactation Risk Categories (L1-L5).

Maternal dose

mg/day

Daily maternal dose if known.

Infant age

months

Younger infants are more vulnerable.

Premature infant Premature infants have reduced drug metabolism.

Milk-to-plasma ratio (if known)

ratio

Higher ratio means more drug in breast milk.

Infant oral bioavailability (if known)

Percentage of drug absorbed by infant.

Enter values and click Calculate to see results

Medications and Mothers' Milk - Thomas Hale. Hale Publishing (2024). Link
The Transfer of Drugs and Therapeutics into Human Breast Milk. Pediatrics / AAP (2013). Link