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Magnesium Hydroxide use while Breastfeeding

Drugs containing Magnesium Hydroxide: Mylanta, Phillips' Milk of Magnesia, Maalox, Milk of Magnesia, Gelusil, Maalox Plus, Mintox, Pepcid Complete, Dulcolax Milk of Magnesia, Almacone, Show all 82 »FIRST Mouthwash BLM, Ex-Lax Milk of Magnesia, Rulox, Arthritis Pain Formula, Alamag, Acid Reducer + Antacid Dual Action, Rolaids Regular Strength, Maalox Max, Rolaids Extra Strength, Di-Gel, Urban DS, Maalox Antacid Antigas Regular Strength, Milantex, Haley's M-O, Mylanta Maximum Strength, Aspirin Buffered, Tempo, Mag-al Plus, Maalox Advanced Maximum Strength, Phillips' Haleys M-O, Dual Action Complete, Tums Dual Action, Acid Controller Complete Dual Action, Mylanta Maximum Strength Cherry, Aldroxicon II, Mintox Extra Strength, Mintox Maximum Strength, Maalox Max Wild Berry, Zegerid with Magnesium Hydroxide, Mylanta Gelcap, Advanced Formula Di-Gel, Aldroxicon I, Di-Gel Lemon, Di-Gel Mint, Rolaids Multi-Symptom, Mylanta Supreme, Fast Acting Mylanta, Mi-Acid Double Strength, Mylanta Ultra, Masanti Supreme, Pedia-Lax Chewable Tablets, Almacone-2, Mylanta Ultimate Strength, Maldroxal, Maalox Advanced Regular Strength, Flanax Antacid Liquid, Mylanta Fast Acting, Milantex Maximum Strength, Mintox Tablets, Maalox HRF, Aspir-Mox, Magnaprin, Aspir-Mox IB, Maalox TC, Rulox 1, ConRx AR, Mylanta DS Fast Acting, Masanti DS, Rulox Plus, Magaant, Uni-Lan, Uni-Lan II, Maldroxal Plus, Urban, Mylagen-II, Mylagen, Masanti, Mi-Acid, Alamag Plus, Mi-Acid II, Mintox Plus, Maalox Plus Extra 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.

Drug Levels

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.[1]

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.[2]

Effects on Lactation and Breastmilk

Relevant published information was not found as of the revision date.

Alternate Drugs to Consider

Bisacodyl, Docusate, Psyllium, Sodium Picosulfate, Sodium Phosphate


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

Substance Name

Magnesium Hydroxide

CAS Registry Number


Drug Class



Gastrointestinal Agents

Magnesium Compounds

Administrative Information

LactMed Record Number


Last Revision Date



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