Interferon Alfa use while Breastfeeding
Interferon Alfa Levels and Effects while Breastfeeding
Summary of Use during Lactation
Because of the low levels in milk, poor oral absorption by the infant, it is unlikely that interferon use by a nursing mother presents any serious risk to the breastfed infant. Holder pasteurization (62.5 degrees C for 30 minutes) decreases the concentration of endogenous interferon-gamma by an average about 10%.
Maternal Levels. Two mothers taking interferon alfa had milk levels measured. One mother taking 8 million units three times a week had a milk level of 1400 units/L and another taking 8 million units/day had a milk level of 6000 units/L. Both levels were apparently measured immediately postpartum (in colostrum), but the time since the previous dose was not stated.
An intravenous dose of 30 million units of interferon alfa-2B in one woman resulted in a peak milk level of 1551 International Units/L which was a slight increase over two baseline levels prior to the dose which averaged 1072 International Units/L. By 12 hours after the dose, milk interferon levels were lower than baseline.
Infant Levels. Relevant published information was not found as of the revision date.
Effects in Breastfed Infants
One infant was born to a mother who received 3 million units of interferon alfa-2a subcutaneously 3 times weekly during pregnancy and postpartum for essential thrombocytopenia. Her infant was breastfed for 2 weeks postpartum before bilateral mastitis caused the mother to terminate nursing. The infant reportedly thrived, although specific measures were not mentioned.
Effects on Lactation and Breastmilk
Relevant published information was not found as of the revision date.
Alternate Drugs to Consider
(Hepatitis B) Lamivudine, (Hepatitis C) Interferon Alfacon, Peginterferon Alfa
1. Ewaschuk JB, Unger S, O'Connor DL et al. Effect of pasteurization on selected immune components of donated human breast milk. J Perinatol. 2011;31:593-8. PMID: 21330996
2. Haggstrom J, Adriansson M, Hybbinette T et al. Two cases of CML treated with alpha-interferon during second and third trimester of pregnancy with analysis of the drug in the new-born immediately postpartum. Eur J Haematol. 1996;57:101-2. Letter. PMID: 8698119
3. Kumar AR, Hale TW, Mock RE. Transfer of interferon alfa into human breast milk. J Hum Lact. 2000;16:226-8. PMID: 11153157
4. Williams JM, Schlesinger PE, Gray AG. Successful treatment of essential thrombocythaemia and recurrent abortion with alpha interferon. Br J Haematol. 1994;88:647-8. PMID: 7819084
Interferon Alfa Identification
CAS Registry Number
98530-12-2; 76543-88-9; 77907-69-8
LactMed Record Number
Last Revision Date
Information presented in this database is not meant as a substitute for professional judgment. You should consult your healthcare provider for breastfeeding advice related to your particular situation. The U.S. government does not warrant or assume any liability or responsibility for the accuracy or completeness of the information on this Site.