How to Treat or Cure Magnesium Deficiency

Treatment aims to correct the low level, treat the cause and prevent it from returning.

Step 1: Confirm

A blood test shows magnesium, with potassium, calcium, kidney function and sometimes an ECG. A urine test may show whether the kidneys are losing magnesium.

Step 2: Treat the cause

• Reduce or stop alcohol with support
• Treat diarrhoea or malabsorption
• Review medicines that lower magnesium
• Control diabetes
• Treat inherited or kidney tubular disorders under a specialist

Step 3: Replace magnesium

• Mild to moderate: oral supplements and a magnesium-rich diet, with a repeat blood test
• Severe, with symptoms such as seizures or arrhythmia: intravenous magnesium in hospital, with heart monitoring
• Low potassium and low calcium are corrected at the same time

Step 4: Follow up

Repeat tests to check that levels have normalised and stay normal. Body stores take time to refill, so supplements may continue for a while.

Outlook

Most people recover fully when the cause is treated. Symptoms often improve within days to weeks.

When to go to hospital

Seizures, fainting, severe weakness, chest pain or a very irregular heartbeat. Call 112.

Complementary care

Ayurveda and diet changes may support recovery but should not replace testing and replacement.

Key point

Confirm with a blood test, treat the cause and replace magnesium safely.

Before your appointment

Note your symptoms, when they began, and what makes them better or worse. Mention alcohol use, diarrhoea, vomiting, diabetes, kidney disease, bowel conditions and any recent illness. List all medicines, especially diuretics, acid-reducing medicines, antibiotics, supplements and herbal products. Write down your usual diet and any antacids or laxatives you take. Ask about blood tests for magnesium, potassium and calcium, and whether an ECG is needed. Call 112 for seizures, fainting, severe weakness or a very irregular heartbeat.