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Magnesium oxide

relieves: ■ acid indigestion ■ upset stomach.

Sold without prescription in some countries Oral

How to use Magnesium oxide

What the official label says. If a doctor prescribed it, follow the prescription. Your pack's leaflet comes first if it is different.

Who it is for

Relieves: ■ acid indigestion ■ upset stomach

How to take it and how often
  • Take one or two antacid tablets daily
  • Do not exceed two tablets unless directed by a physician
Talk to a doctor first if
  • Kidney disease you are taking a prescription drug (antacids may interact with certain prescription drugs) you are pregnant or breast feeding
  • Do not take more than 2 tablets in a 24 hour period
  • May have a laxative effect
Warnings

Ask a doctor before use if you have kidney disease you are taking a prescription drug (antacids may interact with certain prescription drugs) you are pregnant or breast feeding. Do not take more than 2 tablets in a 24 hour period. May have a laxative effect. Keep out of reach of children.

How to store it

Store at controlled room temperature 15° to 30°C (59° to 86°F). Tamper evident, do not use if imprinted safety seal under cap is broken or missing.

If you miss a dose

Take it when you remember, unless it is nearly time for the next dose. Then skip the missed one. Never take two doses at once to make up for it. Check your leaflet, as some medicines are different.

From the official U.S. FDA label for this active ingredient. Your pack may have a different strength, so always read its leaflet. If a doctor prescribed it, follow the prescription. Ask a pharmacist if you are unsure. Label dated 2025-10-21.

Brands around the world

Products with Magnesium oxide as the active ingredient. Names differ between countries.

Registered products

United States (FDA)

Magnesium OxideMAGNESIUM OXIDE 420 mg/1 · Tablet · Marlex Pharmaceuticals Inc.
NDC 10135-721Label
Magnesium OxideMAGNESIUM OXIDE 400 mg/1 · Tablet · Aphena Pharma Solutions - Tennessee, LLC
NDC 71610-172Label
Magnesium OxideMAGNESIUM OXIDE 400 mg/1 · Tablet · Aphena Pharma Solutions - Tennessee, LLC
NDC 71610-182Label
Prenate ChewableCALCIUM CARBONATE 500 mg/1, CHOLECALCIFEROL 7.5 ug/1, MAGNESIUM OXIDE 50 mg/1 · Tablet, Chewable · Avion Pharmaceuticals, LLC
NDC 75854-306Label
Prenate RestoreASCORBIC ACID 85 mg/1, CHOLECALCIFEROL 1000 [iU]/1, .ALPHA.-TOCOPHEROL ACETATE, DL- 10 [iU]/1 · Capsule, Gelatin Coated · Avion Pharmaceuticals, LLC
NDC 75854-308Label

Nigeria (NAFDAC)

NAFDACBiotonic Capsule A11-0364NAFDACBiomult Oral Liquid A11-100648

Other countries: check your pack's registration number and we point you to your regulator.

Check your pack of Magnesium oxide

Or take photos of the pack
3 free checks left today Official sources: U.S. FDA · EMA (EU) · NAFDAC · WHO alerts

Questions about Magnesium oxide

What is Magnesium oxide used for?

relieves: ■ acid indigestion ■ upset stomach (From the official U.S. FDA label.)

How do I take Magnesium oxide?

Follow your prescription or the leaflet in your pack. The official label says: take one or two antacid tablets daily. Do not exceed two tablets unless directed by a physician.…

Do I need a prescription for Magnesium oxide?

In many countries Magnesium oxide is sold without a prescription in some strengths. Rules differ by country, so ask a pharmacist.

What brands contain Magnesium oxide?

Magnesium oxide is sold under names such as Folgard Os, Lactocal, Vitafol-one, Somnicin, Clenpiq, Beelith, Phillips' Cramp-free, Magmilax. Brand names differ between countries.

How can I check that my Magnesium oxide is genuine?

Scan the registration number on your pack with PillVera (NAFDAC number in Nigeria, NDC in the United States, DIN in Canada), check the expiry date and buy only from licensed pharmacies.