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Anastrozole Pregnancy and Breastfeeding Warnings

Anastrozole is also known as: Arimidex

Medically reviewed on October 23, 2017

Anastrozole Pregnancy Warnings

Use is contraindicated in women who are or may become pregnant.

AU TGA pregnancy category: C
US FDA pregnancy category: X

Animal studies have revealed pregnancy failures, increased pregnancy loss, signs of delayed fetal development, significant incidences of infertility, and adverse effects on reproductive organs. However, there was no evidence of teratogenicity in animal data. There are no controlled data in human pregnancy.

AU TGA pregnancy category C: Drugs which, owing to their pharmacological effects, have caused or may be suspected of causing, harmful effects on the human fetus or neonate without causing malformations. These effects may be reversible. Accompanying texts should be consulted for further details.

US FDA pregnancy category X: Studies in animals or humans have demonstrated fetal abnormalities and/or there is positive evidence of human fetal risk based on adverse reaction data from investigational or marketing experience, and the risks involved in use of the drug in pregnant women clearly outweigh potential benefits.

See references

Anastrozole Breastfeeding Warnings

AU and UK: Use is contraindicated during breastfeeding.
US: A decision should be made whether to discontinue breastfeeding or to discontinue the drug, taking into account the importance of the drug to the mother

Excreted into human milk: Unknown
Excreted into animal milk: Data not available

Comments: The effects in the nursing infant are unknown.

See references

References for pregnancy information

  1. "Product Information. Arimidex (anastrozole)." Zeneca Pharmaceuticals, Wilmington, DE.
  2. Cerner Multum, Inc. "Australian Product Information." O 0
  3. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0

References for breastfeeding information

  1. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
  2. "Product Information. Arimidex (anastrozole)." Zeneca Pharmaceuticals, Wilmington, DE.
  3. Cerner Multum, Inc. "Australian Product Information." O 0

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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