Magnesium

Magnesium
Mechanism of action

Cofactor for at least 300 enzymes involved in key biochemical processes like oxidative phosphorylation, glycolysis, or ATP metabolism.

Also plays important role in for example nerve function, muscle contraction or transmembrane ion flux. 

Indications and dose

Medicinal forms

1 tablet of Magnesium lactate 500 mg = 50 mg of Magnesium

Solution for injection/infusion: 1 vial of Magnesium sulphate 10% => 100 mg/ml (10 ml=1 g), 20% = 200 mg/ml (10 ml=2 g)

Side-effects

Hypotension

Hypophosphatemia, hypertonic dehydration

Respiratory depression

Nausea, vomiting, drowsiness, confusion, coma

Hyporeflexia

Arrhythmias, cardiac arrest

Flushing 

Muscle weakness

Reversal

In a case of symptomatic hypermagnesemia: administer calcium 100–200 mg IV over 5–10 min. 

References

  1. Magnesium: Uses, Interactions, Mechanism of Action | DrugBank Online
  2. Torsade de Pointes - StatPearls - NCBI Bookshelf (nih.gov)
  3. Pharm 101: Magnesium • LITFL • Top 200 Drugs
  4. https://www.medicines.org.uk/emc/search?q=magnesium