Product image of Milk Of Magnesia (Magnesium Hydroxide) supplied by GNH India

Milk Of Magnesia

Active Ingredient:
Magnesium Hydroxide
Origin:
EU

Milk Of Magnesia (Magnesium Hydroxide)

Magnesium hydroxide, the active ingredient in Milk of Magnesia, is an antacid presented as an oral suspension for oral use. It provides relief of occasional constipation and treats heartburn and dyspepsia in adults and children.

GNH India supplies Milk of Magnesia as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, pharmacies and clinics worldwide.

Manufacturer / TM Owner

Omega Pharma Hellas S.A.

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Indications & Clinical Uses

Milk of Magnesia (magnesium hydroxide) is used to manage conditions related to excess gastric acidity and reduced intestinal motility.

  • Heartburn: neutralizes stomach acid to relieve burning sensation.
  • Dyspepsia: reduces gastric discomfort and bloating associated with indigestion.
  • Occasional constipation: draws water into the intestine to soften stool and promote bowel movements.
  • Acid reflux: alleviates symptoms by decreasing gastric acidity.

How It Works

  • Magnesium hydroxide acts as a weak base that reacts with hydrochloric acid in the stomach to form magnesium chloride and water, thereby raising gastric pH. In the intestine, the poorly absorbed magnesium ions increase osmotic pressure, retaining water in the lumen and promoting bowel evacuation. The neutralization reduces irritation of the gastric mucosa, while the osmotic effect softens stool and facilitates peristalsis.

Side Effects

Magnesium hydroxide may cause a range of adverse reactions, most of which are mild and transient.

Common Side Effects

  • Diarrhea: loose stools due to increased intestinal water.
  • Abdominal cramping: mild stomach discomfort.
  • Nausea: feeling of sickness.
  • Flatulence: increased gas production.
  • Electrolyte imbalance: mild changes in serum magnesium.

Serious or Rare Side Effects

  • Hypermagnesemia: elevated magnesium levels, especially in renal impairment.
  • Severe dehydration: excessive fluid loss from prolonged diarrhea.
  • Allergic reaction: rash, itching, or swelling.
  • Electrolyte disturbances: significant shifts in potassium or calcium.

Precautions & Warnings

When using Milk of Magnesia, certain precautions should be observed to minimize risks.

  • Assess renal function: avoid use in severe renal impairment.
  • Monitor electrolyte status: watch for magnesium excess in patients on other magnesium‑containing products.
  • Use with caution in elderly: increased susceptibility to dehydration.
  • Avoid prolonged use: chronic use may lead to dependence for bowel movements.
  • Pregnancy and lactation: safety not established; consult healthcare professional.
  • Store at ambient temperature: keep in original container, protect from moisture and direct sunlight.

Avoid Interactions

Magnesium hydroxide can interact with other medicines, altering their absorption or effect.

Major Interactions (Avoid)

  • Tetracycline antibiotics: reduced absorption, may decrease efficacy.
  • Bisphosphonates: chelation reduces drug bioavailability.
  • Iron supplements: magnesium binds iron, lowering iron absorption.

Moderate Interactions (Monitor Closely)

  • Digoxin: increased serum levels due to electrolyte shifts.
  • Potassium‑sparing diuretics: risk of hypermagnesemia.
  • Levothyroxine: may impair absorption, separate dosing by at least 4 hours.

Frequently Asked Questions

Milk of Magnesia contains magnesium hydroxide and is used as an antacid to relieve heartburn and dyspepsia, and as an osmotic laxative to treat occasional constipation by increasing water content in the intestines.

Magnesium hydroxide neutralizes excess stomach acid through a chemical reaction that raises gastric pH, while its poorly absorbed magnesium ions create an osmotic gradient in the gut, drawing water into the lumen and softening stool for easier passage.

The appropriate dose of Milk of Magnesia is determined by a prescriber based on the individual’s age, condition, and response. Patients should follow the specific instructions provided by their healthcare professional.

Safety of magnesium hydroxide in pregnancy and lactation has not been definitively established. Women who are pregnant, planning to become pregnant, or breastfeeding should consult their healthcare provider before using Milk of Magnesia.

To order Milk of Magnesia, submit an enquiry on the product page at gnhindia.com specifying the required quantity. GNH India works with hospitals, pharmacies and procurement teams worldwide, verifies trade or institutional credentials, and then provides pricing, availability, shipping details and any required import documentation.

Compared with acid‑neutralizing agents such as calcium carbonate or aluminum hydroxide, magnesium hydroxide offers both antacid and laxative effects. This dual action can be advantageous for patients who need relief from heartburn and also experience constipation, but it may cause more gastrointestinal looseness than non‑laxative antacids.

Store Milk of Magnesia at ambient temperature, preferably below 25 °C. Keep the container tightly closed, protect it from moisture and direct sunlight, and retain it in the original packaging to maintain product stability.

Milk of Magnesia is taken orally as a liquid suspension. The prescribed amount is measured with a calibrated dosing spoon or cup, and the product is usually swallowed directly or mixed with a small amount of water, following the healthcare provider’s directions.

Serious risks include hypermagnesemia, especially in patients with renal impairment, severe dehydration from prolonged diarrhea, and allergic reactions such as rash, itching or swelling. Prompt medical attention is required if any of these serious symptoms occur.

Milk of Magnesia should be avoided in individuals with known hypersensitivity to magnesium hydroxide, severe renal disease, or those who are taking other magnesium‑containing medications without medical supervision. Consultation with a healthcare professional is essential before use.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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