Is it good to drink magnesium milk?

December 4, 2025 •

3 min read

Milk of Magnesia, a suspension of magnesium hydroxide, has been a staple in medicine cabinets for decades due to its use as a laxative and antacid. However, confusion often arises due to its name, leading many to question if this medicinal product is a dietary supplement for regular consumption.

Quick Summary

This article clarifies that 'magnesium milk' refers to the medicinal product Milk of Magnesia, which should not be consumed regularly like dairy milk. It details its function as a short-term treatment for constipation and indigestion, outlining potential risks and recommended usage guidelines. Essential comparisons and safety precautions are also included.

Key Points

Not a Dairy Product: Milk of Magnesia is a medicinal suspension of magnesium hydroxide, not a dairy item, despite its name and appearance.
Strictly for Occasional Use: It is an effective, short-term treatment for constipation and indigestion, and should not be consumed daily or for extended periods.
Risk of Electrolyte Imbalance: Excessive or chronic use can lead to hypermagnesemia, a serious condition caused by an over-absorption of magnesium.
Potential for Dependency: Long-term use of any laxative, including Milk of Magnesia, can cause bowel dependency and disrupt natural function.
Kidney Disease Precaution: Individuals with kidney problems should avoid Milk of Magnesia, as they are at a higher risk for magnesium toxicity.
Consult a Doctor: If constipation or other digestive issues persist beyond one week, seek medical advice to rule out underlying conditions.

What is Milk of Magnesia?

Despite its milky-white appearance and name, Milk of Magnesia is not a dairy product. Its technical name is magnesium hydroxide, and it functions as both an antacid and a saline laxative. In smaller doses, the magnesium hydroxide neutralizes stomach acid to relieve heartburn and indigestion. At higher doses, it acts as an osmotic laxative, drawing water into the intestines to soften stool and promote bowel movements. This key difference in dosage dictates its function within the body.

How Magnesium Hydroxide Works

Magnesium hydroxide works through a distinct dual mechanism depending on the dose.

As an antacid: When taken in smaller amounts, the alkaline magnesium hydroxide neutralizes excess stomach acid, providing quick relief from symptoms like heartburn, sour stomach, and indigestion.
As a laxative: In larger doses, the unabsorbed magnesium ions draw water into the intestines via osmosis. This increases the fluid content of the stool, making it softer and easier to pass. The increased volume also stimulates bowel activity, promoting a natural-feeling evacuation.

Is it Safe to Drink Magnesium Milk Daily?

Experts and medical professionals strongly advise against drinking Milk of Magnesia on a daily or long-term basis. It is intended for short-term, occasional use to address specific digestive issues like constipation or acid reflux, not as a dietary supplement. Prolonged or excessive use can lead to serious health complications, primarily due to the risk of magnesium toxicity and electrolyte imbalances.

Risks of Overuse

Electrolyte Imbalances: Over-absorption of magnesium can disrupt the body's natural electrolyte balance, leading to a condition called hypermagnesemia. Symptoms can include muscle weakness, confusion, slow heartbeat, and in severe cases, more serious complications.
Dependency: Your bowels can become dependent on the laxative effect, resulting in a 'lazy bowel' where normal function is compromised without the aid of medication.
Dehydration: The osmotic action draws water from the body into the intestines. Used excessively, this can lead to dehydration.
Kidney Strain: Individuals with impaired kidney function are at particular risk, as their bodies are less efficient at removing excess magnesium. This significantly increases the risk of toxicity.

When is it appropriate to use Milk of Magnesia?

Milk of Magnesia is an effective over-the-counter remedy for specific, short-term gastrointestinal issues. Its appropriate uses include:

Occasional Constipation: For those experiencing infrequent bowel movements, Milk of Magnesia can provide overnight relief within 30 minutes to 6 hours.
Heartburn and Indigestion: In smaller, antacid-level doses, it can quickly neutralize stomach acid to alleviate discomfort.

For persistent issues, dietary changes, increased fiber intake, and staying hydrated are generally safer long-term strategies. Always consult a healthcare provider for chronic conditions or before starting any new medication.

Milk of Magnesia vs. Other Laxatives


Feature	Milk of Magnesia (Osmotic Laxative)	Stimulant Laxatives (e.g., Dulcolax)	Fiber Supplements (e.g., Psyllium)
Mechanism	Draws water into the bowel to soften stool and increase bulk.	Stimulates muscle contractions in the intestinal wall to force bowel movement.	Adds bulk to the stool, helping it retain water and move through the colon.
Speed of Action	Relatively fast; 30 minutes to 6 hours.	Can be faster than osmotic laxatives, but harsher.	Slower onset, often takes 12-72 hours for full effect.
Gentleness	Considered gentle when used as directed, due to natural osmotic action.	Can cause cramping and discomfort due to forced muscle contractions.	Very gentle, designed for long-term use and prevention.
Use Case	Occasional constipation, heartburn, and indigestion.	Short-term relief for severe or stubborn constipation.	Prevention and management of chronic constipation.

Conclusion: Safe Use and Medical Advice

Drinking Milk of Magnesia is not the same as consuming a dairy product and should be approached with caution. It is an effective but short-term solution for specific digestive problems like occasional constipation and acid indigestion. For the vast majority of people, incorporating a high-fiber diet, maintaining proper hydration, and exercising regularly offers a more sustainable path toward digestive health. Avoid prolonged or daily use, as this can lead to significant health risks, including laxative dependency and dangerous electrolyte imbalances. Always consult a healthcare provider for chronic symptoms, and never use this product to compensate for an unhealthy diet or lifestyle. When used correctly and with awareness, Milk of Magnesia can be a valuable tool; when misused, its benefits turn into risks.

If you have concerns about chronic constipation, digestive issues, or magnesium intake, consult a healthcare professional. For additional guidance, the National Institutes of Health provides extensive resources on magnesium and its effects.

Frequently Asked Questions

Milk of Magnesia is a medicinal compound containing magnesium hydroxide suspended in water, used as a laxative and antacid. Dairy milk is a nutrient-rich food from animals. The 'milk' in the name simply refers to its milky-white appearance.

No, Milk of Magnesia is not for everyday health or regular supplementation. It is designed for short-term relief of occasional constipation and indigestion. For daily magnesium intake, rely on a balanced diet rich in leafy greens, nuts, and whole grains, or discuss supplements with a healthcare provider.

Daily use can lead to laxative dependency, disrupt your body's electrolyte balance, and cause dehydration. This can result in serious health issues, including hypermagnesemia, which can be particularly dangerous for those with kidney problems.

Milk of Magnesia should not be used for more than one week for constipation unless directed by a doctor. If the issue persists, consult a healthcare provider to determine the underlying cause and explore long-term solutions.

Milk of Magnesia is available in specific formulations for children, but it's crucial to consult a doctor before administering it, especially for children under 6. Always follow the dosage instructions on the packaging or your doctor's orders.

Milk of Magnesia can interact with and decrease the absorption of other medications, including antibiotics, iron supplements, and thyroid hormones. To avoid interactions, take it at least 2 hours before or after other medications.

Safer, long-term alternatives include increasing dietary fiber from fruits, vegetables, and whole grains, ensuring adequate hydration, and engaging in regular physical activity. For persistent issues, fiber supplements or stool softeners are also options, but discuss them with a doctor.