Part 4: Parenteral Additives

12: Magnesium Sulfate

 

Chapter outlines

Composition
Pharmacological Basis
Preeclampsia and eclampsia
Preterm labor
Asthma
Cardiac arrhythmias
Hypokalemia
Tetanus
Indications
Hypomagnesemia
Obstetric practice
- Preeclampsia and eclampsia
- Fetal neuroprotection
- Preterm labor
Acute asthma
Cardiac arrhythmias
Hypokalemia
Hypocalcemia
Tetanus
Migraine
Aneurysmal subarachnoid hemorrhage
COPD
Contraindications and Precautions
Adverse Effects
Administration
Monitoring
Antidote
Injection Magnesium sulfate (MgSO4) is the most common parenterally used magnesium salt in clinical practice.

COMPOSITION

Injection Magnesium sulfate is available in different concentrations.
Injection 50% Magnesium Sulfate
Each ml contains:
  Magnesium Sulfate USP 500 mg
  4.06 mEq or 2.03 mmol Magnesium ions
  Osmolarity 4,060 mOsm/L
50% Magnesium Sulfate per ampoule: 1 gm/2 ml and 5 gm/10 ml
Injection 20% Magnesium Sulfate
  Magnesium Sulfate USP 2 gm/10 ml
Injection 10% Magnesium Sulfate
  Magnesium Sulfate USP 1 gm/10 ml
Conversion relationships: Magnesium Sulfate 1 gm = 4 mmol mg = 8 mEq mg

PHARMACOLOGICAL BASIS

Magnesium is the second most common intracellular cation. It is an essential co-factor in many biochemical reactions and plays a vital role in nerve transmission, neurochemical transmission, cardiac excitability, muscular excitability, and vasomotor tone. It also affects the regulation of calcium and potassium.

A. Preeclampsia and eclampsia

Magnesium sulfate is an effective treatment for eclampsia, but the exact mechanism of action remains unclear and is suggested to be multi-factorial (works through both vascular and neurological mechanisms) [1]. Different proposed mechanisms are:

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