Last update: Sept. 19, 2016


Low Risk for breastfeeding

Moderately safe. Probably compatible.
Mild risk possible. Follow up recommended.
Read the Comment.

Recombinant-type of alfa-L-iduronidase that is used in enzyme replacement therapy in patients with Mucopolysaccharidosis I (MPS I).

Its high molecular weight explains the null passage observed in the milk of a nursing mother who had received weekly doses of Laronidase for three months, while she was breastfeeding. No physical or developmental problems in infants in the short or long term were observed.

Its low oral bioavailability hampers its passage from the breast milk ingested to the infant's plasma since it is degraded in the gastrointestinal tract due to its proteinaceous nature. It is not absorbed by the gut except in the immediate neonatal period or prematurity when intestinal permeability may be increased.

Weekly administration and short half life span allows, if desired, developing strategies to further minimize the risk of exposure (e.g. avoid breastfeeding between 4 and 8 hours after receiving a dose, using the "pump and dump method" of the breast milk while the baby is fed with previously extracted milk)


We do not have alternatives for Laronidase.

Suggestions made at e-lactancia are done by APILAM´s pediatricians and pharmacists, and are based on updated scientific publications.
It is not intended to replace the relationship you have with your doctor but to compound it.

Jose Maria Paricio, Founder & President of APILAM/e-Lactancia

Your contribution is essential for this service to continue to exist. We need the generosity of people like you who believe in the benefits of breastfeeding.

Thank you for helping to protect and promote breastfeeding.

José María Paricio, founder of e-lactancia.

Other names

Laronidase is also known as

Laronidase in other languages or writings:


Main tradenames from several countries containing Laronidase in its composition:


Variable Value Unit
Oral Bioavail. Baja - Poor %
Molecular weight 83.000 daltons
VD 0,6 l/Kg
T1/2 1,5 - 3,6 hours


  1. EMA. Laronidase. Drug Summary. 2016 Full text (in our servers)
  2. EMA. Laronidasa. Ficha técnica. 2016 Full text (in our servers)
  3. Castorina M, Antuzzi D, Richards SM, Cox GF, Xue Y. Successful pregnancy and breastfeeding in a woman with mucopolysaccharidosis type I while receiving laronidase enzyme replacement. therapy. Clin Exp Obstet Gynecol. 2015 Abstract

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