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Magnesium: uses, side effects & brands
Magnesium supports muscle and nerve function and may help cramps and constipation. It belongs to the Vitamin & supplement group. Supplements correct deficiencies and support health when diet or absorption falls short.
Drug type — dosing is set by your doctor
| Measure | Range |
|---|---|
| Drug class | Vitamin & supplement |
| Type | Prescription |
| Dose | Individual — ask your doctor or pharmacist |
What it is used for
- Low magnesium levels in the blood
- Constipation (some magnesium salts act as laxatives)
- Indigestion and heartburn (as an antacid)
- Muscle cramps (evidence of benefit is limited)
Common brand names
- India: Mgluconate, Magnamit
- Worldwide: (magnesium oxide/citrate brands)
Common side effects
- Loose stools or diarrhoea
- Stomach cramps
- Nausea
Before taking it — precautions
- Kidney disease — magnesium can build up to dangerous levels; ask your doctor first
- Magnesium reduces absorption of some antibiotics, thyroid tablets and osteoporosis tablets — take them a few hours apart
- Tell your doctor if you take water tablets or long-term acid-reducing tablets, which can change magnesium levels
When to see a doctor urgently
- Severe weakness, drowsiness, very slow heartbeat or fainting (signs of too much magnesium) (urgent)
- Severe or ongoing diarrhoea with signs of dehydration
- Rash, swelling of the face or difficulty breathing (urgent)
Frequently asked questions
Does magnesium help leg cramps?
It may help some people, especially if levels are low, but the evidence is mixed. Stretching and enough fluids also help.
Are all magnesium products the same?
No — different salts behave differently; some mainly work as laxatives or antacids. Ask your pharmacist which suits your need.
Is magnesium safe with kidney problems?
Only with your doctor's advice, because weak kidneys cannot clear extra magnesium.
Explore more
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.