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Gentle Relief for Constipation & Acidity

By Apollo pharmacy, Published On- 04 June 2025

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Digestive issues like constipation and acidity are common problems faced by people across India, often caused by irregular eating habits, spicy food, stress, or dehydration. While the market is flooded with quick-fix medicines, one tried-and-tested remedy continues to hold its place for safe and effective relief, milk of magnesia. This age-old solution has been trusted for generations to gently ease both constipation and acidity without harsh side effects. Whether you’re dealing with bloating, gas, or acid reflux, milk of magnesia offers dependable relief that works naturally with your body. Its dual-action formula not only neutralises excess stomach acid but also promotes smooth bowel movements, making it a must-have in every household. In this blog, we’ll take a closer look at what milk of magnesia is, how it works, when to use it, and why it remains a reliable and popular digestive aid for millions of people seeking gentle, effective relief.

What is Milk of Magnesia?

Milk of magnesia is the common name for a suspension of magnesium hydroxide in water. This white, milky liquid has long been used as an antacid and laxative. It was first introduced in the 19th century and has since become a staple in digestive health due to its dual action on the stomach and intestines. Milk of magnesia is available over the counter in liquid and tablet form, often flavoured for easier consumption. It is widely recommended by healthcare professionals due to its well-established safety profile and gentle mode of action.

How Does Milk of Magnesia Work?

Milk of magnesia works through two primary mechanisms, depending on how it is used:

1. As a Laxative

  • Magnesium hydroxide draws water into the intestines through a process called osmosis.
  • This softens the stool and stimulates bowel movement, offering relief from constipation.
  • Effects typically begin within 6 to 12 hours of ingestion, making it a reliable solution for overnight relief.

2. As an Antacid

  • When taken in smaller doses, milk of magnesia neutralises excess stomach acid.
  • This alleviates symptoms such as heartburn, indigestion, and acid reflux.
  • Relief is often felt within 30 minutes of consumption.


Consult Top Gastroenterologist

Conditions Treated with Milk of Magnesia

Milk of magnesia can be used to manage a variety of common digestive complaints. Some of the key conditions include:

  • Constipation: Constipation affects people of all ages and can result from poor diet, lack of fibre, dehydration, medication side effects, or inactivity. Milk of magnesia acts as a gentle osmotic laxative to stimulate natural bowel movement without causing cramping or dependency.
  • Acidity and Heartburn: Overeating, spicy foods, or stress can lead to an overproduction of stomach acid. When used as an antacid, milk of magnesia provides fast relief from burning sensations in the chest, sour taste in the mouth, and stomach discomfort.
  • Indigestion: If you're feeling heavy or bloated after a meal, milk of magnesia can ease digestive discomfort by neutralising acid and promoting smoother digestion.

Benefits of Milk of Magnesia

The popularity of milk of magnesia lies in its combination of efficacy and safety. Some of its top benefits include:

  • Dual Functionality: It acts as both a laxative and antacid, making it ideal for those experiencing constipation and acidity together.
  • Fast and Effective Relief: Constipation relief is typically achieved within 6 to 12 hours, while acidity relief is even faster, usually within half an hour.
  • Gentle on the Body: Unlike stimulant laxatives that force bowel movement, milk of magnesia works naturally by drawing water into the gut. This reduces the risk of cramping or long-term dependency.
  • Suitable for Various Age Groups: With proper dosage adjustments, milk of magnesia can be used for children (aged over 6), adults, and the elderly. It’s also safe during pregnancy under medical guidance.
  • Non-Habit Forming: It does not stimulate nerves or muscles in the bowel, which lowers the risk of dependency and makes it suitable for occasional use.

How to Take Milk of Magnesia?

Milk of magnesia is usually taken by mouth in liquid form, although chewable tablets are also available. Always read the label carefully or follow your healthcare provider's instructions. General dosage guidelines include:

  • For Constipation (Adults and Children over 12): 30-45 ml once daily, preferably at bedtime.
  • For Acidity/Indigestion: 5-15 ml up to 4 times a day.
  • Children (6-11 years): Based on weight and need, the paediatrician will prescribe the dosage.
  • Shake the bottle well before use. It's best to take it with a full glass of water. Do not exceed the recommended dose unless advised by a doctor.

Precautions and Side Effects

Though generally safe, milk of magnesia should be used with care in certain individuals. Side effects are rare but can include:

  • Diarrhoea (if taken in excess)
  • Nausea or stomach cramps
  • Electrolyte imbalance (with prolonged use)
  • Avoid or consult a doctor before using milk of magnesia if you:
  • Have kidney problems or are on a magnesium-restricted diet
  • Are taking prescription medications (to avoid interactions)
  • Experience ongoing constipation or abdominal pain

It is also important not to use milk of magnesia for more than three consecutive days without medical supervision, especially for children and the elderly.

When to Seek Medical Advice?

If constipation persists beyond three days or is accompanied by symptoms such as severe pain, nausea, vomiting, or blood in the stools, consult a doctor immediately. Similarly, if heartburn occurs frequently or does not improve with milk of magnesia, further investigation may be needed to rule out conditions like GERD or peptic ulcers.


Consult Top Gastroenterologist For More Tips

Milk of Magnesia vs Other Digestive Remedies

There are many over-the-counter options for digestive issues, but milk of magnesia remains a top choice for several reasons:

Remedy

Type

Main Use

Onset

Dependency Risk

Milk of Magnesia

Osmotic Laxative / Antacid

Constipation, Acidity

30 mins – 12 hours

Low

Senna

Stimulant Laxative

Constipation

6–12 hours

Higher

Antacid Tablets (e.g., Tums)

Antacid

Heartburn

15–30 minutes

Low

Lactulose

Osmotic Laxative

Chronic Constipation

24–48 hours

Low

Milk of magnesia stands out for its rapid relief and gentle nature, particularly when a multi-symptom solution is required.

Tips for Enhancing Digestive Health Naturally

While milk of magnesia provides effective short-term relief, long-term digestive wellness depends on lifestyle choices. Incorporate the following habits to reduce reliance on medication:

  • Eat a high-fibre diet: Include fruits, vegetables, whole grains, and legumes.
  • Stay hydrated: Drink at least 6 to 8 glasses of water daily.
  • Stay active: Regular exercise helps stimulate intestinal function.
  • Avoid trigger foods: Cut down on spicy, fried, or acidic foods if you experience frequent indigestion.
  • Eat smaller, balanced meals: This aids digestion and reduces bloating.

Conclusion

When digestive troubles strike, milk of magnesia offers a time-tested, gentle remedy. Whether you're dealing with occasional constipation or an uncomfortable bout of acidity, its soothing and effective properties can provide much-needed relief, often overnight. With the right dose and proper usage, milk of magnesia is a safe and reliable ally for both adults and children. Just remember, while it’s excellent for short-term relief, long-term digestive health begins with healthy lifestyle habits. For persistent or severe symptoms, always consult a healthcare provider. From generations past to modern-day homes, milk of magnesia continues to earn its place as a trusted solution for soothing the stomach and supporting regularity, naturally and gently.
 

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