Health Dictionary Find a Doctor

Magnesium oxide

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Rabin Bista, M.B.B.S. [2]

WikiDoc MAKES NO GUARANTEE OF VALIDITY. WikiDoc is not a professional health care provider, nor is it a suitable replacement for a licensed healthcare provider. WikiDoc is intended to be an educational tool, not a tool for any form of healthcare delivery. The educational content on WikiDoc drug pages is based upon the FDA package insert, National Library of Medicine content and practice guidelines / consensus statements. WikiDoc does not promote the administration of any medication or device that is not consistent with its labeling. Please read our full disclaimer here.

Overview

Magnesium oxide is a antacid that is FDA approved for the treatment of acid indigestion, upset stomach. Common adverse reactions include diarrhea, allergic reaction.

Adult Indications and Dosage

FDA-Labeled Indications and Dosage (Adult)

Indications

Directions

  • Antacid Directions: (take 1 tablet twice a day or as directed by a physician
  • Magnesium Supplement Directions: (take 1 to 2 tablets daily or as directed by a physician

Off-Label Use and Dosage (Adult)

Guideline-Supported Use

There is limited information regarding Off-Label Guideline-Supported Use of Magnesium oxide in adult patients.

Non–Guideline-Supported Use

There is limited information regarding Off-Label Non–Guideline-Supported Use of Magnesium oxide in adult patients.

Pediatric Indications and Dosage

FDA-Labeled Indications and Dosage (Pediatric)

  • Safety and efficacy in pediatrics patients has not been established.

Off-Label Use and Dosage (Pediatric)

Guideline-Supported Use

There is limited information regarding Off-Label Guideline-Supported Use of Magnesium oxide in pediatric patients.

Non–Guideline-Supported Use

There is limited information regarding Off-Label Non–Guideline-Supported Use of Magnesium oxide in pediatric patients.

Contraindications

There is limited information regarding Magnesium oxide Contraindications in the drug label.

Warnings

  • Do Not Use
  • Do not take more than 2 tablets in a 24 hour period or use the maximum dosage of this product for more than two weeks, except under the advice and supervision of a physician. May have a laxative effect.
  • Ask a Doctor if you have:
  • Kidney disease
  • Ask a Doctor/Pharmacist before use if you are:
  • Taking a prescription drug. Antacids may interact with certain prescription drugs.
  • Pregnancy or Breast Feeding
  • If pregnant or breast feeding, ask a health professional before use.
  • Keep Out of Reach of Children

Adverse Reactions

Clinical Trials Experience

There is limited information regarding Clinical Trial Experience of Magnesium oxide in the drug label.

Postmarketing Experience

Laxative adverse reaction

Drug Interactions

There is limited information regarding Magnesium oxide Drug Interactions in the drug label.

Use in Specific Populations

Pregnancy

Pregnancy Category (FDA):

  • If pregnant or breast feeding, ask a health professional before use.


Pregnancy Category (AUS):

  • Australian Drug Evaluation Committee (ADEC) Pregnancy Category

There is no Australian Drug Evaluation Committee (ADEC) guidance on usage of Magnesium oxide in women who are pregnant.

Labor and Delivery

There is no FDA guidance on use of Magnesium oxide during labor and delivery.

Nursing Mothers

If pregnant or breast feeding, ask a health professional before use.

Pediatric Use

There is no FDA guidance on the use of Magnesium oxide with respect to pediatric patients.

Geriatic Use

There is no FDA guidance on the use of Magnesium oxide with respect to geriatric patients.

Gender

There is no FDA guidance on the use of Magnesium oxide with respect to specific gender populations.

Race

There is no FDA guidance on the use of Magnesium oxide with respect to specific racial populations.

Renal Impairment

There is no FDA guidance on the use of Magnesium oxide in patients with renal impairment.

Hepatic Impairment

There is no FDA guidance on the use of Magnesium oxide in patients with hepatic impairment.

Females of Reproductive Potential and Males

There is no FDA guidance on the use of Magnesium oxide in women of reproductive potentials and males.

Immunocompromised Patients

There is no FDA guidance one the use of Magnesium oxide in patients who are immunocompromised.

Administration and Monitoring

Administration

Monitoring

There is limited information regarding Monitoring of Magnesium oxide in the drug label.

IV Compatibility

There is limited information regarding IV Compatibility of Magnesium oxide in the drug label.

Overdosage

There is limited information regarding Chronic Overdose of Magnesium oxide in the drug label.

Pharmacology

Template:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox entryTemplate:Chembox ECNumberTemplate:Chembox E numberTemplate:Chembox RTECSTemplate:Chembox AppearanceTemplate:Chembox OdourTemplate:Chembox DensityTemplate:Chembox MeltingPtTemplate:Chembox BoilingPtTemplate:Chembox SolubilityInWaterTemplate:Chembox SolubilityTemplate:Chembox BandGapTemplate:Chembox ThermalConductivityTemplate:Chembox RefractIndexTemplate:Chembox DipoleTemplate:Chembox StructureTemplate:Chembox ThermochemistryTemplate:Chembox MainHazardsTemplate:Chembox RPhrasesTemplate:Chembox NFPATemplate:Chembox FlashPtTemplate:Chembox NIOSH (set)Template:Chembox OtherAnionsTemplate:Chembox OtherCationsTemplate:Chembox Supplement

Mechanism of Action

    Structure

    • ACTIVE INGREDIENTS
    Magnesium Oxide 400mg (241.3mg elemental magnesium)
    • INACTIVE INGREDIENTS
    Colloidal silicon dioxide, croscarmellose sodium, microcrystalline cellulose, stearic acid

    Pharmacodynamics

    There is limited information regarding Pharmacodynamics of Magnesium oxide in the drug label.

    Pharmacokinetics

    There is limited information regarding Pharmacokinetics of Magnesium oxide in the drug label.

    Nonclinical Toxicology

    There is limited information regarding Nonclinical Toxicology of Magnesium oxide in the drug label.

    Clinical Studies

    There is limited information regarding Clinical Studies of Magnesium oxide in the drug label.

    How Supplied

    • do not use if imprinted safety seal under cap is broken or missing
    • Magnesium content per tablet: 240 mg

    Storage

    • store at room temperature 59°-86° F (15°-30°C)

    Images

    Drug Images

    {{#ask: Page Name::Magnesium oxide |?Pill Name |?Drug Name |?Pill Ingred |?Pill Imprint |?Pill Dosage |?Pill Color |?Pill Shape |?Pill Size (mm) |?Pill Scoring |?NDC |?Drug Author |format=template |template=DrugPageImages |mainlabel=- |sort=Pill Name }}

    Package and Label Display Panel

    PRINCIPAL DISPLAY PANEL

    This image is provided by the National Library of Medicine.

    Ingredients and Appearance

    This image is provided by the National Library of Medicine.

    {{#ask: Label Page::Magnesium oxide |?Label Name |format=template |template=DrugLabelImages |mainlabel=- |sort=Label Page }}

    Patient Counseling Information

    There is limited information regarding Patient Counseling Information of Magnesium oxide in the drug label.

    Precautions with Alcohol

    • Alcohol-Magnesium oxide interaction has not been established. Talk to your doctor about the effects of taking alcohol with this medication.

    Brand Names

    Look-Alike Drug Names

    There is limited information regarding look alike drug names.

    Price

    References

    The contents of this FDA label are provided by the National Library of Medicine.

    © 2026 MyEClinic – IFTM Institut für Telematik in der Medizin GmbH