Magnesium Hydroxide use while Breastfeeding
Drugs containing Magnesium Hydroxide: Mylanta, Milk of Magnesia, Maalox, Phillips' Milk of Magnesia, Maalox Plus, Mintox, Ascriptin, Rolaids Regular Strength, Gelusil, Maalox Antacid Antigas Regular Strength, Show all 83 »Ex-Lax Milk of Magnesia, Pepcid Complete, Almacone, FIRST Mouthwash BLM, Maalox Advanced Maximum Strength, Mi-Acid, Rolaids Extra Strength, Rulox, Mintox Plus, Alamag, Acid Reducer + Antacid Dual Action, Dulcolax Milk of Magnesia, Acid Controller Complete Dual Action, Maalox Max, Maalox Plus Extra Strength, Maldroxal Plus, Urban, Mylanta Ultra, Mylanta Gelcap, Phillips' Haleys M-O, Alamag Plus, Maalox Advanced Regular Strength, Maldroxal, Masanti, Maalox Max Wild Berry, Tums Dual Action, Mylanta Maximum Strength Cherry, Milantex, Dual Action Complete, Zegerid with Magnesium Hydroxide, Flanax Antacid Liquid, Haley's M-O, Fast Acting Mylanta, Di-Gel Lemon, Di-Gel Mint, Advanced Formula Di-Gel, Mylanta Maximum Strength, Mi-Acid Double Strength, Masanti Supreme, Mylanta Supreme, Rolaids Multi-Symptom, Pedia-Lax Chewable Tablets, Mylagen-II, Maalox TC, Rulox 1, Mintox Tablets, ConRx AR, Mylanta Fast Acting, Milantex Maximum Strength, Mylanta Ultimate Strength, Maalox HRF, Magnaprin, Ascriptin Maximum Strength, Aspirin Buffered, Arthritis Pain Formula, Aspir-Mox IB, Aspir-Mox, Mylanta DS Fast Acting, Masanti DS, Urban DS, Uni-Lan II, Tempo, Aldroxicon I, Mintox Extra Strength, Aldroxicon II, Uni-Lan, Di-Gel, Almacone-2, Mi-Acid II, Mylagen, Magaant, Rulox Plus, Mintox Maximum Strength
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.
Possible Effects on Lactation
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
Information from the National Library of Medicine's LactMed Database.
Last Revision Date
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