Magnesium Oxide

|Magnesium Oxide

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Magnesium Oxide

Generic Name: Magnesium Oxide Capsules and Tablets (mag-NEE-zee-um OX-ide)
Brand Name: Examples include Mag-Caps and Mag-Ox

Magnesium Oxide is used for:

Treating acid indigestion, heartburn, sour stomach, and low magnesium levels in the body. It also may be used to treat other conditions as determined by your doctor.

Magnesium Oxide is an essential mineral. It works by adding magnesium to your body if your magnesium levels are low. As an antacid, it works by neutralizing stomach acid.

Do NOT use Magnesium Oxide if:

  • you are allergic to any ingredient in Magnesium Oxide

Contact your doctor or health care provider right away if any of these apply to you.

Before using Magnesium Oxide :

Some medical conditions may interact with Magnesium Oxide . Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:

  • if you are pregnant, planning to become pregnant, or are breast-feeding
  • if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
  • if you have allergies to medicines, foods, or other substances
  • if you have appendicitis, diarrhea, a blockage of your intestines, heart problems, or kidney problems

Some MEDICINES MAY INTERACT with Magnesium Oxide . Tell your health care provider if you are taking any other medicines, especially any of the following:

  • Anticoagulants (eg, warfarin) because the actions and side effects of these medicines may be increased
  • Penicillamine because the effectiveness of Magnesium Oxide may be decreased

This may not be a complete list of all interactions that may occur. Ask your health care provider if Magnesium Oxide may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.

How to use Magnesium Oxide :

Use Magnesium Oxide as directed by your doctor. Check the label on the medicine for exact dosing instructions.

  • Take Magnesium Oxide with food.
  • If you are also taking a bisphosphonate (eg, alendronic acid), digoxin, a quinolone (eg, ciprofloxacin), or a tetracycline (eg, doxycycline) along with Magnesium Oxide , they should be taken at least 2 to 4 hours apart.
  • If you miss a dose of Magnesium Oxide and are using it regularly, take it as soon as possible. If it is almost time for the next dose, skip the missed dose and go back to your regular dosing schedule. Do not take 2 doses at once.

Ask your health care provider any questions you may have about how to use Magnesium Oxide .

Important safety information:

  • Do not take more than 2 tablets in a 24-hour period or for more than 2 weeks without checking with your health care provider.
  • If you are taking Magnesium Oxide for relief of acid indigestion, heartburn, or sour stomach and your symptoms do not improve within 2 weeks, if they become worse, or if you experience black, tarry stools or vomit that looks like coffee grounds, check with your doctor.
  • LAB TESTS, including magnesium levels, may be performed to monitor your progress or to check for side effects. Be sure to keep all doctor and lab appointments.
  • Magnesium Oxide is not recommended for CHILDREN younger than 6 years of age. Safety and effectiveness of this age group have not been confirmed.
  • PREGNANCY and BREAST-FEEDING: If you plan on becoming pregnant, discuss with your doctor the benefits and risks of using Magnesium Oxide during pregnancy. If you are or may be pregnant, check with your doctor for instructions on using Magnesium Oxide during pregnancy. It is unknown if Magnesium Oxide is excreted in breast milk. If you are or will be breast-feeding, check with your doctor to discuss the risks to your baby.

Possible side effects of Magnesium Oxide :

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:


Seek medical attention right away if any of these SEVERE side effects occur:

Severe allergic reactions (rash; hives; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); black, tarry stools; nausea; slow reflexes; vomit that looks like coffee grounds.

This is not a complete list of all side effects that may occur. If you have questions or need medical advice about side effects, contact your doctor or health care provider. You may report side effects to the FDA at 1-800-FDA-1088 (1-800-332-1088) or at

If OVERDOSE is suspected:

Contact 1-800-222-1222 (the American Association of Poison Control Centers), your local poison control center (, or emergency room immediately. Symptoms may include confusion; dizziness; flushing; loss of consciousness; muscle weakness; severe drowsiness; slow heartbeat.

Proper storage of Magnesium Oxide :

Store Magnesium Oxide at room temperature, between 68 and 77 degrees F (20 and 25 degrees C). Store away from heat, moisture, and light. Do not store in the bathroom. Keep Magnesium Oxide out of the reach of children and away from pets.

General information:

  • If you have any questions about Magnesium Oxide , please talk with your doctor, pharmacist, or other health care provider.
  • Magnesium Oxide is to be used only by the patient for whom it is prescribed. Do not share it with other people.
  • If your symptoms do not improve or if they become worse, check with your doctor.

This information is a summary only. It does not contain all information about Magnesium Oxide . If you have questions about the medicine you are taking or would like more information, check with your doctor, pharmacist, or other health care provider.

Issue Date: November 1, 2006
Database Edition
Copyright © 2006 Wolters Kluwer Health, Inc.

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