5th April 2024

Management

The cause of low magnesium should be identified and any contributing medications stopped where possible. Oral replacement can be used for biochemical hypomagnesaemia in asymptomatic patients but severe deficiency requires intravenous replacement with magnesium sulphate. Local guidelines should be followed and the maximum infusion rate should not exceed 2 g/hour. Serum magnesium or 24-hour urinary magnesium excretion may be monitored to measure response to treatment.