Drug Levels and Effects:

Summary of Use during Lactation:

Limited information indicates that a maternal dose of 500 mg of nitazoxanide produces low levels of an active metabolite, tizoxanide, in breastmilk and would not be expected to cause any adverse effects in breastfed infants, especially if the infant is older than 2 months. But until more data become available, an alternate drug may be preferred, especially while nursing a newborn or preterm infant.

Drug Levels:

After oral administration, nitazoxanide is not found in the bloodstream, but is rapidly converted to the active metabolites, tizoxanide and tizoxanide glucuronide, which are detectable in plasma.

Maternal Levels.

A volunteer lactating mother took a single 500 mg oral dose of nitazoxanide as a commercial suspension (Nitazode [Al Andalous Medical Co., Cairo, Egypt]). The concentration of the active metabolite, tizoxanide, was 1.4 mg/L at 6 hours after the dose. Tizoxanide glucuronide was not measured.[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.

Possible Effects on Lactation:

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


1. Hadad GM, Abdel Salam RA, Emara S. Validated and optimized high-performance liquid chromatographic determination of tizoxanide, the main active metabolite of nitazoxanide in human urine, plasma and breast milk. J Chromatogr Sci. 2012;50:509-15. PMID:22525879

Substance Identification:

Substance Name:


CAS Registry Number:


Drug Class:

  • Antiinfective Agents

  • Antiparasitic Agents

  • Administrative Information:

    LactMed Record Number:


    Last Revision Date:

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