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Magnesium Hydroxide

    DEA Class; OTC

    Common Brand Names; Milk of Magnesia

    • Milk of Magnesia

    Magnesium hydroxide is an oral saline laxative; also known as milk of magnesia
    Used most commonly for occasional constipation in adult and pediatric patients 2 years and older
    Can be used as an antacid although it is usually combined with an aluminum- or calcium-containing antacid for this use

    Indicated for the occasional treatment of constipation.

    For the temporary relief of pyrosis (heartburn), upset stomach (dyspepsia), and/or acid indigestion.

    Renal failure

    Existing electrolyte imbalance

    Appendicitis symptoms or acute surgical abdomen

    Myocardial damage or heart block

    Fecal impaction or rectal fissures

    Intestinal obstruction or perforation

    Undiagnosed abdominal pain

    • Abdominal cramping
    • Diarrhea
    • Electrolyte imbalance
    • Hypotension
    • Muscle weakness
    • Respiratory depression

    Use with caution in renal insufficiency

    Pregnancy category: A

    Lactation: Use in nursing mothers appears to be safe

    Consult package label; maximum daily dosage is age and product specific. Do not exceed recommended daily dosage in any 24 hour period.

    Magnesium hydroxide

    chewable tablet

    • 311mg

    • 400mg


    • 7.75%

    • 400mg/5mL

    • 800mg/5mL

    • 1200mg/15mL

    • 2400mg/10mL