Magnesium

Mineral
ALSO SOLD WITHOUT PRESCRIPTION

Magnesium is a mineral found in 1 medicine sold in India, such as Calcimax Forte. Below: what it is for, how it works, how to take it, side effects, interactions and pregnancy advice.

Also called: magnesium oxide, magnesium citrate

What it is used for

Supports muscles, nerves and bones; used for low magnesium and sometimes cramps.

How it works

A mineral for muscles, nerves and heart rhythm; supplements are used for cramps, constipation, migraine prevention and low levels.

How to take it

Usually 200 to 400 mg a day with food; citrate and glycinate are absorbed better than oxide.

Common side effects

  • Diarrhoea
  • Stomach upset

Get medical help straight away if

Weakness, slow heartbeat or drowsiness (too much, especially with kidney disease)

Be careful

Can cause loose motions; caution with kidney disease.

Other medicines and interactions

Reduces absorption of quinolone and tetracycline antibiotics, bisphosphonates and levothyroxine; separate by 2 to 4 hours.

Pregnancy and breastfeeding

Usual doses are considered acceptable in pregnancy and breastfeeding.

Combination medicines that contain Magnesium (1)

Calcimax Forte

Common questions

What is Magnesium used for?

Supports muscles, nerves and bones; used for low magnesium and sometimes cramps.

How does Magnesium work?

A mineral for muscles, nerves and heart rhythm; supplements are used for cramps, constipation, migraine prevention and low levels.

How should I take Magnesium?

Usually 200 to 400 mg a day with food; citrate and glycinate are absorbed better than oxide.

What are the side effects of Magnesium?

Common: Diarrhoea, stomach upset. Get help straight away for: Weakness, slow heartbeat or drowsiness (too much, especially with kidney disease).

Does Magnesium interact with other medicines?

Reduces absorption of quinolone and tetracycline antibiotics, bisphosphonates and levothyroxine; separate by 2 to 4 hours.

Is Magnesium safe in pregnancy and breastfeeding?

Usual doses are considered acceptable in pregnancy and breastfeeding.

Does Magnesium need a prescription in India?

It is usually sold without a prescription in India, but ask a pharmacist if you take other medicines or have a long-term illness.

Which brands contain Magnesium?

Calcimax Forte.

Sources and further reading

NHS (UK National Health Service) and MedlinePlus (US National Library of Medicine) are free, reviewed medicine guides. Brand names and doses there may differ from India.

Last reviewed 31 October 2026. Written by Satya Babu from standard prescribing information.

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For information only, not medical advice. This page is a plain-language summary written from standard prescribing information and the public guides linked below. Brands sometimes change their formula, so always check the composition printed on the pack. Doses here are typical adult doses; yours may differ. Do not start, stop or change a medicine without your doctor or pharmacist, and keep all medicines away from children. In an emergency, call 112 (India) or your local emergency number.