Skip to Content

Magnesium sulfate Pregnancy and Breastfeeding Warnings

Magnesium sulfate is also known as: Epsom Salt, Sulfamag

Magnesium sulfate Pregnancy Warnings

Use is recommended only if clearly needed and the benefit outweighs the risk. AU TGA pregnancy category: D US FDA pregnancy category: D Comments: -Intravenous use beyond 5 to 7 days can cause fetal abnormalities. -Continuous IV infusion, especially more than 24 hours before delivery, can result in magnesium toxicity, including neuromuscular or respiratory depression, in the newborn. -Use for preterm labor should be by obstetrical personnel in a hospital with appropriate obstetrical care facilities. -Inform women that efficacy and safety for preterm labor has not been established, and that use beyond 5 to 7 days can cause fetal abnormalities. -Avoid use in the 2 hours before delivery unless it is the only therapy available for eclamptic seizures. -Monitor fetal heart rate.

There are no controlled data in human pregnancy. Magnesium sulfate readily crosses the placenta and may produce hypotonia and hypotension; fetal serum concentrations approximate those of the mother. Retrospective studies and case reports show fetal abnormalities such as hypocalcemia, skeletal demineralization, osteopenia, congenital rickets, and other skeletal abnormalities with continuous maternal administration for more than 5 to 7 days. Additionally, neonatal fractures have been reported. Increased pediatric mortality has been noted when used for pre-term labor. If administered in the 2 hours preceding delivery, the neonate may have signs of hypermagnesemia, including respiratory and neuromuscular depression. AU TGA pregnancy category D: Drugs which have caused, are suspected to have caused or may be expected to cause, an increased incidence of human fetal malformations or irreversible damage. These drugs may also have adverse pharmacological effects. Accompanying texts should be consulted for further details. 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

Magnesium sulfate Breastfeeding Warnings

Safety has not been established; use only if clearly needed. Excreted into human milk: Yes Comments: -The concentration of magnesium in breast milk is approximately twice that of maternal serum concentrations. -50 to 90% of magnesium in breast milk is absorbed. -Magnesium is cleared from breast milk within 24 hours of cessation of intravenous magnesium

See references

References for pregnancy information

  1. "Product Information. Magnesium Sulfate (magnesium sulfate)." Abbott Pharmaceutical, Abbott Park, IL.
  2. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
  3. Cerner Multum, Inc. "Australian Product Information." O 0

References for breastfeeding information

  1. "Product Information. Magnesium Sulfate (magnesium sulfate)." Abbott Pharmaceutical, Abbott Park, IL.
  2. Cerner Multum, Inc. "Australian Product Information." O 0
  3. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
  4. Australian Government, Department of Health and Ageing, National Health and Medical Research Council "Nutrient Reference Values for Australia and New Zealand Including Recommended Dietary Intakes Available from: URL:" ([2006]):

See Also...

Disclaimer: Every effort has been made to ensure that the information provided by Cerner Multum, Wolters Kluwer Health and is accurate, up-to-date and complete, but no guarantee is made to that effect. In addition, the drug information contained herein may be time sensitive and should not be utilized as a reference resource beyond the date hereof. This material does not endorse drugs, diagnose patients, or recommend therapy. This drug information is a reference resource designed as supplement to, and not a substitute for, the expertise, skill , knowledge, and judgement of healthcare practitioners in patient care. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate that the drug or combination is safe, effective, or appropriate for any given patient. Multum Information Services, Inc. does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. Copyright 2000-2008 Multum Information Services, Inc. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse, or pharmacist.