What Is Used For

What Is Magnesium Oxide 400 Mg Used For

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Magnesium oxide 400 mg is commonly used for several health purposes, including as a supplement to treat or prevent low magnesium levels, for relief of heartburn and indigestion, and as a short-term laxative to relieve constipation[1][5][6][7]. Magnesium is an essential mineral required for proper function of nerves, muscles, and cells, and adequate intake helps support overall health[2][4].

Primary uses for magnesium oxide 400 mg include:

  • Treating magnesium deficiency: Supplementation may be recommended if diet alone does not provide enough magnesium, or in cases where certain medical conditions increase magnesium needs[5][7].
  • Relief from heartburn and indigestion: Magnesium oxide acts as an antacid, neutralizing stomach acid and relieving symptoms of acid reflux, heartburn, and upset stomach[1][6][7].
  • Laxative effect: It can be used for short-term relief of constipation by softening stools and encouraging bowel movements[1][3][7].
  • Migraine prevention: Some research suggests that magnesium oxide may help prevent migraines, with typical supplemental doses ranging from 400–500 mg per day[1][3].
  • Supporting blood pressure and blood sugar regulation: Evidence indicates magnesium may have a mild effect lowering blood pressure and aiding blood sugar control, especially in people with hypertension or diabetes, although magnesium oxide is not as well absorbed as other forms[2][3][4].

Magnesium oxide is available over the counter and is generally well tolerated, but it can interact with certain medications and may cause gastrointestinal side effects, such as diarrhea and stomach cramps, especially at higher doses[3][6]. Individuals with kidney disease or other conditions affecting magnesium metabolism should consult a healthcare professional before use[3].

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