Summary of Use during Lactation

No information is available on the use of pegvaliase during breastfeeding, but amounts in milk appear to be trivial. Absorption of the drug by the infant from breastmilk is unlikely because it is a polypeptide that is probably destroyed in the infant's gastrointestinal tract. Pegvaliase may decrease the phenylalanine content of breastmilk. The manufacturer recommends monitoring blood phenylalanine concentrations in breastfeeding women treated with pegvaliase.

Drug Levels

Maternal Levels. A woman with phenylketonuria stopped her pegvaliase during pregnancy and for 7 months while breastfeeding her infant. After weaning, she restarted pegvaliase and pumped breastmilk samples for analysis while taking a dose of 20 mg daily. The activity of phenylalanine ammonia lyase (the active portion of pegvaliase) was equal to background levels found in blank breastmilk and TRIS buffer solution.[1]

Infant Levels. Relevant published information was not found as of the revision date.

Effects in Breastfed Infants

Relevant published information was not found as of the revision date.

Effects on Lactation and Breastmilk

Relevant published information was not found as of the revision date.

References

1.

Rohr F, Kritzer A, Harding CO, et al. Discontinuation of pegvaliase therapy during maternal PKU pregnancy and postnatal breastfeeding: A case report. Mol Genet Metab Rep. 2020;22:100555. [PMC free article: PMC6957825] [PubMed: 31956506]

Substance Name

Pegvaliase

CAS Registry Number

1585984-95-7

Drug Class

Breast Feeding

Lactation

Enzymes

Lyases

Recombinant Proteins

Phenylalanine Ammonia Lyase,