Magnesium is a mineral that your body needs to function properly.
Magnesium oxide is a supplement that contains magnesium and oxygen ions. It’s used to treat a variety of conditions, including heartburn, indigestion, constipation, a magnesium deficiency, and other ailments.
This supplement is available without a prescription.
When magnesium oxide is sold as an over-the-counter (OTC) product, there aren’t universal manufacturing standards in place. You should be sure to purchase this supplement from a reliable source.
Magnesium oxide is one type of magnesium supplement. There are a variety of other formulations available, including magnesium chloride, magnesium sulfate, magnesium citrate, and magnesium chlorate. It’s best to talk with your physician or a nutritionist before taking magnesium or using it for long periods.
uses
What is Magnesium Oxide (Mag-Ox 400) used for?
- Dyspepsia
- Constipation
- Vitamin/Mineral Supplementation during Pregnancy/Lactation
warnings
What is the most important information I should know about Magnesium Oxide (Mag-Ox 400)?
You should not take magnesium oxide if you are allergic to it.
Ask a doctor or pharmacist if this medicine is safe to use if you have or have ever had:
- stomach pain, nausea, vomiting;
- a sudden change in bowel habits that has lasted longer than 2 weeks;
- if you are on a low-magnesium diet; or
- kidney disease.
Ask a doctor before using this medicine if you are pregnant or breastfeeding.
Do not give this medicine to a child without medical advice.
User Reviews & Rating
Overall rating for Magnesium Oxide (Mag-Ox 400)
Side Effects
What are the side effects of Magnesium Oxide (Mag-Ox 400)?
Get emergency medical help if you have signs of an allergic reaction: hives, difficult breathing, swelling of your face, lips, tongue, or throat.
Stop using magnesium oxide and call your doctor at once if you:
- have rectal bleeding; or
- do not have a bowel movement after using magnesium oxide as a laxative.
Common side effects may include:
- nausea, vomiting;
- diarrhea; or
- stomach pain, loss of appetite.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
Pregnancy & Breastfeeding
Can I take Magnesium Oxide (Mag-Ox 400) if I’m pregnant or breastfeeding?
Ask a doctor before using this medicine if you are pregnant or breastfeeding.
Interactions
What drugs and food should I avoid while taking Magnesium Oxide (Mag-Ox 400)?
Avoid taking other medications at the same time you use an antacid. Some antacids can make it harder for your body to absorb other medicines you take by mouth.
Dosage Guidelines & Tips
How to take Magnesium Oxide (Mag-Ox 400)?
Use Magnesium Oxide (Mag-Ox 400) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.
Use exactly as directed on the label, or as prescribed by your doctor.
Take this medicine with a full glass of water.
When using this medicine as a laxative, it may be best to take your dose at bedtime.
Magnesium oxide may be taken with food if it upsets your stomach.
Stop using magnesium oxide and call your doctor if your symptoms do not improve after 7 days of treatment, or if they get worse.
Store at cool room temperature away from moisture and heat.
Magnesium oxide is used when needed. If you are on a dosing schedule, take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next dose. Do not use two doses at one time.
Overdose Signs
What happens if I overdose on Magnesium Oxide (Mag-Ox 400)?
Overdose symptoms may include nausea, vomiting, weakness, breathing problems, slow reflexes, extreme drowsiness, loss of consciousness, and feeling dizzy or light-headed.
What to Expect
Some studies suggest that magnesium oxide is poorly absorbed by the digestive tract.
The best way to get enough magnesium is to eat a well-balanced diet. Good sources of magnesium include green leafy vegetables, legumes, nuts, seeds, and whole grains.
Stop taking magnesium and let your physician know if you experience any unusual side effects.
Additional Dosage Information
The amount of magnesium you require will depend on your age, sex, and whether you’re pregnant or breastfeeding.
The National Institutes of Health (NIH) recommends that women younger than age 30 consume 310 milligrams (mg) of magnesium a day and that men under age 30 consume 400 mg a day. In adults over age 30, the recommended daily allowance is 420 mg for men and 320 mg for women.
Secondary Uses
Though its effectiveness isn’t conclusively proven, magnesium oxide is generally safe and well tolerated and is sometimes taken to help treat other conditions, such as migraines or depression.
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