What is the typical IV magnesium replacement dose?

Mild hypomagnesemia (1.0-1.8 mg/dL): 2g MgSO4 IV over 2h. Severe (<1.0 mg/dL) or symptomatic: 4-8g MgSO4 IV over 4-8h. Max rate 1g/h peripherally.

What symptoms indicate severe hypomagnesemia?

Tetany, seizures, severe arrhythmias (torsades de pointes), and refractory hypokalemia/hypocalcemia indicate severe, symptomatic hypomagnesemia.

What causes hypomagnesemia?

GI losses (diarrhea, malabsorption), renal wasting (diuretics, cisplatin, alcohol), poor intake (malnutrition, PPI use), redistribution (refeeding syndrome).

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Frequently Asked Questions

What is the typical IV magnesium replacement dose?

What symptoms indicate severe hypomagnesemia?

What causes hypomagnesemia?