Last update May 13, 2019


Likely Compatibility

Fairly safe. Mild or unlikely adverse effects. Compatible under certain circumstances. Follow-up recommended. Read Commentary.

An analgesic and pyrazolone derivative which inhibits prostaglandin synthesis.
It has been used as an analgesic and systemic antipyretic but given the frequency and severity of its side effects, the majority of products currently on the market are made for dermatological or otological topical application.

Administered orally to mothers, it is excreted in breastmilk in amounts which could be significant (Berlin 1982).

Hemolytic anemia has been observed in a newborn whose mother was taking a phenazone derivative (Frei 1985).

Systemic use (orally) is contraindicated during breastfeeding.

The small dose and low plasma absorption of most topical dermatological and otic preparations make it unlikely that it will transfer into breastmilk in significant amounts.
Topical use is compatible with breastfeeding.


  • Ibuprofen (Safe substance and/or breastfeeding is the best option.)
  • Paracetamol (Safe substance and/or breastfeeding is the best option.)

Suggestions made at e-lactancia are done by APILAM team of health professionals, and are based on updated scientific publications. It is not intended to replace the relationship you have with your doctor but to compound it. The pharmaceutical industry contraindicates breastfeeding, mistakenly and without scientific reasons, in most of the drug data sheets.

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

Phénazone is Phenazone in French.

Is written in other languages:

Phénazone is also known as


Phénazone belongs to these groups or families:


Main tradenames from several countries containing Phénazone in its composition:


Variable Value Unit
Molecular weight 188 daltons
Protein Binding < 10 %
VD 0.6 l/Kg
Tmax 1 - 2 hours
6 - 20 hours
M/P ratio 1 -
Theoretical Dose 0.56 - 3.1 mg/Kg/d
Relative Dose 3.1 - 17.2 %


  1. Frei H, Bühlmann U, Rudin O. [Toxic hemolytic anemia in the newborn infant following ingestion of a phenazone derivative (Cibalgin) via breast milk]. Z Geburtshilfe Perinatol. 1985 Jan-Feb;189(1):11-2. German. Abstract
  2. Berlin CM Jr, Vesell ES. Antipyrine disposition in milk and saliva of lactating women. Clin Pharmacol Ther. 1982 Jan;31(1):38-44. Abstract

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