Skip to main content

Toremifene Pregnancy and Breastfeeding Warnings

Brand names: Fareston

Medically reviewed by Drugs.com. Last updated on Jul 5, 2023.

Toremifene Pregnancy Warnings

AU: Use of this drug during pregnancy is contraindicated.
UK, US: Use of this drug is not recommended during pregnancy.

AU TGA pregnancy category: B3
US FDA pregnancy category: D

Comments: Based on its mechanism of action in humans and animal study findings of increased pregnancy loss and fetal malformation, this drug may cause fetal harm when administered to a pregnant woman.

In animal studies, this drug crossed the placenta and accumulated in the fetus. These studies showed doses significantly less than the daily maximum recommended human dose resulted in maternal toxicity, increased pre-implantation loss, increased resorptions, reduced fetal weight, fetal anomalies, and impairment in fertility and conception. Additionally, this drug may cause diethylstilbestrol (DES)-like effects (i.e., vaginal adenosis) in offspring like other drugs in this class. There are no controlled data in human pregnancy.

AU TGA pregnancy category B3: Drugs which have been taken by only a limited number of pregnant women and women of childbearing age, without an increase in the frequency of malformation or other direct or indirect harmful effects on the human fetus having been observed. Studies in animals have shown evidence of an increased occurrence of fetal damage, the significance of which is considered uncertain in humans.

US FDA pregnancy category D: There is positive evidence of human fetal risk based on adverse reaction data from investigational or marketing experience or studies in humans, but potential benefits may warrant use of the drug in pregnant women despite potential risks.

See references

Toremifene Breastfeeding Warnings

Use of this drug is not recommended during lactation.

Excreted into human milk: Unknown
Excreted into animal milk: Yes

Comments: In animal studies, decreased body weight gain of the offspring during lactation was observed.

See references

See also

References for pregnancy information

  1. (2001) "Product Information. Fareston (toremifene)." Schering Corporation
  2. Cerner Multum, Inc. "UK Summary of Product Characteristics."
  3. Cerner Multum, Inc. "Australian Product Information."

References for breastfeeding information

  1. (2001) "Product Information. Fareston (toremifene)." Schering Corporation
  2. Cerner Multum, Inc. "UK Summary of Product Characteristics."
  3. Cerner Multum, Inc. "Australian Product Information."

Further information

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

Medical Disclaimer