U.S. flag

An official website of the United States government

NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.

Drugs and Lactation Database (LactMed) [Internet]. Bethesda (MD): National Library of Medicine (US); 2006-.

Cover of Drugs and Lactation Database (LactMed)

Drugs and Lactation Database (LactMed) [Internet].

Show details


Last Revision: July 20, 2020.

Estimated reading time: 1 minute

CASRN: 13539-59-8

image 134989273 in the ncbi pubchem database

Drug Levels and Effects

Summary of Use during Lactation

Apazone (azapropazone) is not approved for marketing in the United States by the U.S. Food and Drug Administration. Relatively small amounts of the drug are excreted into breastmilk; however, the toxicity of the drug limits its usefulness in nursing mothers.[1] An alternate drug is preferred, especially while nursing a newborn or preterm infant.

Drug Levels

Maternal Levels. Four women received apazone 600 mg intravenously within 2 hours postpartum, then twice daily for 5 to 10 days. Apazone was measured in the blood and breastmilk twice between days 4 and 6 postpartum at 4, 8 and 12 hours after the morning dose. The authors calculated that and average of 0.8 mg (range 0.2 to 1.3 mg) of apazone was excreted in milk over a 12-hour dosage interval.[2] Using reported infant and maternal body weights, a fully breastfed infant would receive an average of 2.13% (range 1.04 to 3.03%) of the mother's weight-adjusted dosage.

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.

Alternate Drugs to Consider

(Analgesia) Acetaminophen, Flurbiprofen, Ibuprofen, Indomethacin, Naproxen, Piroxicam; (Hyperuricemia) Probenecid


Spigset O, Hagg S. Analgesics and breast-feeding: Safety considerations. Paediatr Drugs. 2000;2:223–38. [PubMed: 10937472]
Bald R, Bernbeck-Betthauser EM, Spahn H, et al. Excretion of azapropazone in human breast milk. Eur J Clin Pharmacol. 1990;39:271–3. [PubMed: 2257865]

Substance Identification

Substance Name


CAS Registry Number


Drug Class

Breast Feeding


Anti-Inflammatory Agents, Non-Steroidal

Uricosuric Agents

Disclaimer: 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.


Related information

Similar articles in PubMed

See reviews...See all...

Recent Activity

Your browsing activity is empty.

Activity recording is turned off.

Turn recording back on

See more...