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Phentermine Pregnancy and Breastfeeding Warnings

Phentermine is also known as: Adipex-P, Atti-Plex P, Fastin, Ionamin, Lomaira, Obenix, Obephen, Oby-Cap, Oby-Trim, Panshape M, Phentercot, Phentride, Pro-Fast HS, Pro-Fast SA, Pro-Fast SR, Suprenza, T-Diet, Teramine, Teramine ER, Zantryl

Medically reviewed on Jul 26, 2018

Phentermine Pregnancy Warnings

When administered to animals during late gestation at a dose 7 times the maximum human dose (MHD) on a mg/m2 basis, this drug had no adverse effects on the mothers or offspring; however, a dose 10 times the MRD on a mg/m2 basis abolished estrous cycling. There are no controlled data in human pregnancy.

AU TGA pregnancy category B2: 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 are inadequate or may be lacking, but available data show no evidence of an increased occurrence of fetal damage.

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.

This drug should not be used during pregnancy; safety during pregnancy has not been established and weight loss offers no potential benefit to a pregnant woman and may result in fetal harm.

AU TGA pregnancy category: B2
US FDA pregnancy category: X

See references

Phentermine Breastfeeding Warnings

Use should be avoided during breastfeeding.

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. Adipex-P (phentermine)." Teva Pharmaceuticals (formerly Gate Pharmaceuticals), Sellersville, PA.
  2. "Product Information. Phentermine Hydrochloride (phentermine)." Teva Pharmaceuticals USA, North Wales, PA.
  3. Cerner Multum, Inc. "Australian Product Information." O 0
  4. "Product Information. Lomaira (phentermine)." KVK-Tech Inc, Newtown, PA.

References for breastfeeding information

  1. "Product Information. Phentermine Hydrochloride (phentermine)." Teva Pharmaceuticals USA, North Wales, PA.
  2. "Product Information. Lomaira (phentermine)." KVK-Tech Inc, Newtown, PA.
  3. Cerner Multum, Inc. "Australian Product Information." O 0
  4. "Product Information. Adipex-P (phentermine)." Teva Pharmaceuticals (formerly Gate Pharmaceuticals), Sellersville, PA.

Further information

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

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