# Magnesium: The Partner Behind Refractory Electrolytes

Medication review and repeated assessment of losses are as important as the first replacement. Reduced kidney function changes the risk of accumulation.

![Infographic: Magnesium: The Partner Behind Refractory Electrolytes](https://urinenephrology.org/visual-reference/images/mastery-magnesium.png?v=20261003c)

## Multisystem effects

Magnesium participates in membrane stability, enzyme function, and neuromuscular activity. Serum concentration does not perfectly reflect total body stores.

## Recognize low and high states

Deficiency can accompany arrhythmias or refractory hypokalemia and hypocalcemia. Excess can suppress reflexes, conduction, respiration, and blood pressure.

## Look for continuing loss or hidden intake

Diarrhea, loop/thiazide exposure, PPIs, alcohol-related illness, and tubular toxins can sustain magnesium depletion. In reduced kidney function, magnesium-containing antacids or laxatives can accumulate. Ask about over-the-counter products rather than limiting the review to prescribed drugs.

## Replace or remove appropriately

Choose route and intensity based on symptoms, severity, renal clearance, and ongoing losses. Severe excess may require urgent supportive care and dialysis.

## Treat the partner abnormality

Persistent hypokalemia or hypocalcemia despite replacement should prompt magnesium reassessment. Severe symptoms or arrhythmia require monitored treatment; reduced GFR increases accumulation risk. Monitor magnesium with potassium, calcium, rhythm, reflexes, respiratory status, and the clinical response as indicated.

## Prevent recurrence

Medication review and repeated assessment of losses are as important as the first replacement. Reduced kidney function changes the risk of accumulation.

## Source lessons

- [magnesium](https://urinenephrology.org/mastery/electrolytes-advanced/magnesium.html)

Read alongside the full lessons; the findings and decisions shown here require the stated clinical context.