Magnesium is a naturally occurring mineral. Magnesium is important for many systems in the body especially the muscles and nerves. Magnesium hydroxide also reduces stomach acid, and increases water in the intestines which may induce defecation.

Magnesium hydroxide is used as a laxative to relieve occasional constipation (irregularity) and as an antacid to relieve indigestion, sour stomach, and heartburn.

Magnesium hydroxide may also be used for purposes not listed in this medication guide.

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  • Milk of Magnesia
  • Applies to magnesium hydroxide: chewable tablets, suspension, tablets

    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 while taking magnesium hydroxide (the active ingredient contained in Milk of Magnesia)
    Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); loss of appetite; muscle weakness; nausea; slow reflexes; vomiting.
  • Magnesium Hydroxide (oral concentrate, oral suspension, oral tablet, chewable, compounding powder) Please confirm that the medication forms on the dosage document(s) above are relevant for the specific drug you are interested in.