Important: This page is general information, not medical advice. It does not recommend or prescribe any treatment. Always consult your doctor or pharmacist before starting, stopping or changing any medicine.
Quick facts
- How it is given
- intravenous
- Type
- human prescription drug
- RxNorm ID
- 311422
We do not publish dosing. How much of this medicine to take, how often, and for how long depends on your age, weight, kidney and liver function, other conditions and other medicines. That is a decision for the person who prescribes or dispenses it. Follow the directions on your own pack and ask your pharmacist if anything is unclear.
What it is used to treat
INDICATIONS As an electrolyte replenisher in magnesium deficiencies.
About this medicine
DESCRIPTION Magnesium Chloride Injection is a sterile solution of Magnesium Chloride Hexahydrate in Water for Injection q.s. Each mL contains Magnesium Chloride Hexahydrate 200 mg, Sodium Chloride 9 mg, Benzyl Alcohol 1% as a preservative, Water for Injection, q.s. pH adjusted with Hydrochloric Acid and/or Sodium Hydroxide. Total osmolarity equivalent to 2.951 mOsm/mL. Contains 1.97 mEq of Mg ++ and Cl - per mL. The structural formula is MgCl 2 •6H 2 O
Who should not take it
CONTRAINDICATIONS Magnesium Chloride Injection should not be administered if there is renal impairment, marked myocardial disease or to comatose patients.
Warnings
WARNING Do not use if a precipitate is present.
Reported side effects
ADVERSE REACTIONS Flushing, sweating, sharply lowered blood pressure, hypothermia, stupor and ultimately respiratory depression.
Before you take anything new
Tell your pharmacist or doctor about every medicine you take — including ones bought without a prescription, herbal products and supplements. Interactions are one of the most common avoidable causes of harm from medicines, and a pharmacist can check your full list in a couple of minutes.
This page is built from the openFDA record of the U.S. Food and Drug Administration's approved labelling for this product, effective 15 October 2021. Label text has been shortened and reformatted for readability; safety wording has not been altered in meaning. FDA labelling describes products approved in the United States — brand names, strengths, formulations and approved uses may differ in your country. Always read the leaflet that comes with your own pack. PocketsInfo is not affiliated with, and is not endorsed by, the FDA. Retrieved 2026-07-30.