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Magnesium Sulfate

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Magnesium Sulfate

Magnesium Sulfate

Magnesium Sulfate Side Effects Center

Medical Editor: Melissa Conrad Stöppler, MD

Magnesium sulfate injection is used to used to control low blood levels of magnesium. Magnesium sulfate injection is also used for pediatric acute nephritis and to prevent seizures in severe pre-eclampsia, eclampsia, or toxemia of pregnancy. It can be administered intravenously or intramuscularly. Possible side effects can include, but are not limited to, heart disturbances, breathing difficulties, poor reflexes, confusion, weakness, or headache.

Magnesium sulfate is given in the health-care setting and is not administered at home. It may be given in pregnancy to treat pre-eclampsia and eclampsia. The principle hazard in intravenous or intramuscular magnesium therapy is the production of abnormally high levels of magnesium in the blood. Such high levels may cause flushing, sweating, low blood pressure, circulatory collapse, and depression of heart and central nervous system function.

Our Magnesium sulfate elixir Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What is Patient Information in Detail?

Easy-to-read and understand detailed drug information and pill images for the patient or caregiver from Cerner Multum.

Magnesium Sulfate in Detail - Patient Information: Side Effects

Side effects with magnesium sulfate injection are not common. Serious side effects include:

  • an allergic reaction (shortness of breath; closing of the throat; hives; swelling of the lips, face, or tongue; rash; or fainting);
  • heart disturbances;
  • breathing difficulties;
  • poor reflexes;
  • confusion, extreme tiredness or weakness;
  • low body temperature;
  • severe headache;
  • fainting;
  • rash or flushing;
  • vision problems; or
  • nausea or vomiting.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088. You may report side effects to FDA at 1-800-FDA-1088.

Read the entire detailed patient monograph for Magnesium Sulfate (Magnesium Sulfate Injection) »

What is Prescribing information?

The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.

Magnesium Sulfate FDA Prescribing Information: Side Effects
(Adverse Reactions)


Flushing, sweating, sharply lowered blood pressure, hypothermia, stupor and ultimately, respiratory depression.

Read the entire FDA prescribing information for Magnesium Sulfate (Magnesium Sulfate Injection) »


Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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