Magnesium Hydroxide use while Breastfeeding
Drugs containing Magnesium Hydroxide: Mylanta, Maalox, Milk of Magnesia, Phillips' Milk of Magnesia, Maalox Plus, Gelusil, Pepcid Complete, Mintox, Almacone, Maalox Antacid Antigas Regular Strength, Show all 82 »FIRST Mouthwash BLM, Dulcolax Milk of Magnesia, Rulox, Mag-al Plus, Mintox Plus, Rolaids Extra Strength, Arthritis Pain Formula, Milantex, Maalox Advanced Maximum Strength, Mylanta Gelcap, Maalox Advanced Regular Strength, Alamag, Maalox Max, Aspirin Buffered, Tums Dual Action, Rolaids Regular Strength, Acid Reducer + Antacid Dual Action, Di-Gel, Tempo, Pedia-Lax Chewable Tablets, Mi-Acid, Maldroxal, Dual Action Complete, Zegerid with Magnesium Hydroxide, Haley's M-O, Acid Controller Complete Dual Action, Mintox Maximum Strength, Mylanta Maximum Strength, Mylanta Maximum Strength Cherry, Maalox Max Wild Berry, Mylanta Ultra, Advanced Formula Di-Gel, Di-Gel Mint, Mintox Extra Strength, Ex-Lax Milk of Magnesia, Rolaids Multi-Symptom, Mylanta Supreme, Fast Acting Mylanta, Mi-Acid Double Strength, Di-Gel Lemon, Masanti Supreme, Phillips' Haleys M-O, Mylagen, Mylanta Ultimate Strength, Mintox Tablets, Flanax Antacid Liquid, Milantex Maximum Strength, Mylanta DS Fast Acting, Mylanta Fast Acting, Maalox HRF, Rulox 1, Aspir-Mox, Magnaprin, Aspir-Mox IB, Maalox TC, ConRx AR, Masanti DS, Masanti, Urban, Uni-Lan II, Urban DS, Maldroxal Plus, Aldroxicon I, Maalox Plus Extra Strength, Uni-Lan, Rulox Plus, Mi-Acid II, Alamag Plus, Almacone-2, Mylagen-II, Magaant, Aldroxicon II
Magnesium Hydroxide Levels and Effects while Breastfeeding
Summary of Use during Lactation
A study on the use of magnesium hydroxide during breastfeeding found no adverse reactions in breastfed infants. Intravenous magnesium increases milk magnesium concentrations only slightly. Oral absorption of magnesium by the infant is poor, so maternal magnesium hydroxide is not expected to affect the breastfed infant's serum magnesium. Magnesium hydroxide can be taken during breastfeeding and no special precautions are required.
Maternal Levels. Ten women with pre-eclampsia were given 4 grams of magnesium sulfate intravenously followed by 1 gram per hour until 24 hours after delivery. While the average serum magnesium was 35.5 mg/L in treated women compared to 18.2 mg/L in 5 untreated controls, colostrum magnesium levels at the time of discontinuation of the infusion was 64 mg/L in treated women and 48 mg/L in the controls. By 48 hours after discontinuation, colostrum magnesium levels were only slightly above control values and by 72 hours they were virtually identical to controls.
Infant Levels. Relevant published information was not found as of the revision date.
Effects in Breastfed Infants
Fifty mothers who were in the first day postpartum received 15 mL of either mineral oil or an emulsion of mineral oil and magnesium hydroxide equivalent to 900 mg of magnesium hydroxide, although the exact number who received each product was not stated. Additional doses were given on subsequent days if needed. None of the breastfed infants were noted to have any markedly abnormal stools, but all of the infants also received supplemental feedings.
Effects on Lactation and Breastmilk
Relevant published information was not found as of the revision date.
Alternate Drugs to Consider
1. Cruikshank DP, Varner MW, Pitkin RM. Breast milk magnesium and calcium concentrations following magnesium sulfate treatment. Am J Obstet Gynecol. 1982;143:685-8. PMID: 7091241
2. Baldwin WF. Clinical study of senna administration to nursing mothers. Can Med Assoc J. 1963;89:566-7.
Magnesium Hydroxide Identification
CAS Registry Number
LactMed Record Number
Last Revision Date
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