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Phillips' Milk Of Magnesia Liquid Traditional Mint Flavour- 200ml

Phillips' Milk Of Magnesia Liquid Traditional Mint Flavour- 200ml

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  • ✔️ Relieves occasional constipation with gentle osmotic action
  • ✔️ Neutralises excess stomach acid to ease indigestion
  • ✔️ Produces results within 30 minutes to 6 hours
  • ✔️ Suitable for adults and children aged 3 and over
  • ✔️ Mint flavour makes dosing more palatable and easy

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What Is Milk of Magnesia Liquid and How Can It Help You?

 

Phillips' Milk of Magnesia Liquid Traditional Mint Flavour is a well-established, over-the-counter remedy that has been trusted in UK households for generations. It contains magnesium hydroxide as its active ingredient — a naturally occurring mineral compound that works in two distinct ways depending on the dose you take. At lower doses, it acts as an antacid to ease indigestion and heartburn. At higher doses, it functions as an osmotic laxative to relieve constipation. If you've been struggling with an uncomfortable, sluggish digestive system or that burning sensation after a heavy meal, this could be exactly what you need. You can explore other indigestion remedies at Cured Pharmacy if you'd like to compare your options.

The mint flavour makes it noticeably more palatable than unflavoured alternatives, which is a genuine practical benefit — especially if you've ever tried to swallow a chalky, plain suspension. Each 200ml bottle provides a convenient supply for short-term use, and at £6.59 it represents solid value for a dual-action digestive remedy.

 

How Does Phillips' Milk of Magnesia Liquid Work?

 

The active ingredient, magnesium hydroxide, works through two separate mechanisms depending on the dose used:

  • As an antacid: Magnesium hydroxide neutralises excess hydrochloric acid in the stomach, raising gastric pH and relieving the discomfort of indigestion, heartburn, and acid dyspepsia.
  • As an osmotic laxative: At higher doses, it draws water into the large intestine by osmosis. This softens the stool, increases bowel volume, and stimulates peristalsis — the muscular contractions that move contents through the gut.
  • Onset of action: For laxative use, a bowel movement typically occurs within 30 minutes to 6 hours of taking the dose.
  • No systemic stimulant effect: Unlike stimulant laxatives, magnesium hydroxide does not irritate the bowel wall directly, making it generally well tolerated for short-term use.

 

Who Is Phillips' Milk of Magnesia Liquid Suitable For?

 

This product is suitable for adults and children aged 3 years and over, though dosing differs by age group. It's particularly useful for people who experience occasional constipation, acid indigestion, or heartburn and want a straightforward, liquid-format remedy. That said, it isn't right for everyone.

It may be appropriate for you if:

  • You are an adult or child over 3 years experiencing occasional constipation
  • You suffer from indigestion or heartburn after meals
  • You prefer a liquid format over tablets or capsules
  • You want a short-term remedy without a prescription

 

How Does Phillips' Milk of Magnesia Compare to Other Laxatives?

 

Feature Phillips' Milk of Magnesia Liquid Senna Tablets (Stimulant Laxative)
Mechanism Osmotic — draws water into bowel Stimulant — irritates bowel wall
Also treats indigestion? Yes, at lower doses No
Format Liquid suspension Tablet
Suitable for children (3+)? Yes Varies by product

 

How Should You Store Phillips' Milk of Magnesia Liquid?

 

Store this product below 25°C in a cool, dry place away from direct sunlight. Do not refrigerate — chilling can affect the consistency of the suspension. Always keep the bottle tightly closed and out of reach and sight of children. Check the expiry date on the bottle before use; do not use milk of magnesia liquid past its stated expiry date.

If you're managing broader digestive health alongside constipation, it's worth knowing that Cured Pharmacy also stocks a range of products for IBS and cramps that may complement your care plan.

This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Phillips' Milk Of Magnesia Liquid Traditional Mint Flavour 200ml specifications
Treatment category Laxative / Antacid
Mechanism of action Osmotic laxative; antacid (magnesium hydroxide)
Effective for Constipation, indigestion, heartburn
Suitable for Adults and children aged 3 years and over
Active ingredient Magnesium Hydroxide
Pack size 200ml
UK classification General Sale Medicine (GSL)
Drug class Osmotic laxative / Antacid
Preparation Oral suspension (liquid)
Route of administration Oral

Specifications of Phillips' Milk Of Magnesia Liquid Traditional Mint Flavour 200ml

 

What Is Phillips' Milk of Magnesia Liquid and What Is It Used For?

 

Phillips' Milk of Magnesia Liquid Traditional Mint Flavour contains magnesium hydroxide as its active ingredient. It is used to relieve occasional constipation and to treat the symptoms of indigestion and heartburn. As an osmotic laxative, it works by drawing water into the bowel to soften stools and encourage a bowel movement. As an antacid, it neutralises excess stomach acid to ease discomfort after eating. This is a General Sale Medicine (GSL) available without a prescription.

 

What Do You Need to Know Before Using Phillips' Milk of Magnesia Liquid?

 

Do not use this product if any of the following apply to you:

  • You are allergic to magnesium hydroxide or any other ingredient in the product
  • You have kidney disease or severely impaired kidney function
  • You have a bowel obstruction or unexplained abdominal pain
  • You are a child under 3 years of age
  • You have been told to follow a low-magnesium diet

Speak to your doctor or pharmacist before use if you are pregnant, breastfeeding, or have any chronic digestive condition. Prolonged or excessive use of laxatives can lead to dependence and electrolyte imbalance.

The following medicines may interact with magnesium hydroxide. Take this product at least 2 hours apart from:

  • Tetracycline antibiotics (e.g. doxycycline) — absorption may be reduced
  • Iron supplements — magnesium can bind to iron and reduce uptake
  • Some antifungal medicines (e.g. ketoconazole)
  • Certain heart medicines, including digoxin
  • Bisphosphonates used for bone conditions

If you take regular prescribed medicines, always check with your pharmacist before starting this product. You might also find it helpful to browse our constipation treatments to understand the full range of options available.

 

How Should You Use Phillips' Milk of Magnesia Liquid?

 

  1. Shake the bottle well before each use.
  2. Measure the correct dose using the measuring cup or spoon provided.
  3. Take the dose orally, swallowing the liquid directly.
  4. Drink a full glass of water (at least 200ml) immediately after taking the dose.
  5. Do not take more than the recommended daily dose.
  6. Do not use for more than 7 consecutive days without medical advice.
Indication Age Group Dose Frequency
Constipation Adults & children 12+ 30–45ml Once daily (preferably at bedtime)
Constipation Children 6–11 years 15–30ml Once daily
Constipation Children 3–5 years 5–15ml Once daily — seek pharmacist advice first
Indigestion / Heartburn Adults & children 12+ 5–15ml Up to 4 times daily between meals and at bedtime

 

What Are the Possible Side Effects of Phillips' Milk of Magnesia Liquid?

 

Like all medicines, this product can cause side effects, although not everyone experiences them. Most side effects are dose-related and resolve once you stop taking the product.

Common side effects:

  • Diarrhoea — particularly if the dose is too high
  • Stomach cramps or abdominal discomfort
  • Nausea
  • Flatulence

Less common side effects:

  • Elevated blood magnesium levels (hypermagnesaemia) — more likely with prolonged use or in people with kidney problems
  • Weakness or fatigue if magnesium levels become significantly raised
  • Electrolyte imbalance with long-term overuse

Stop using this product and seek medical advice if you experience severe abdominal pain, vomiting, or no bowel movement after use. If you're also managing symptoms like nausea alongside constipation, our sickness and nausea range may be worth exploring.

 

How Should You Store Phillips' Milk of Magnesia Liquid?

 

  • Store below 25°C in a cool, dry place
  • Do not refrigerate — this can alter the suspension
  • Keep the bottle tightly closed when not in use
  • Keep out of the sight and reach of children
  • Do not use after the expiry date printed on the bottle
  • Do not dispose of medicines via wastewater or household waste — return unused product to your pharmacy

Written and reviewed by our qualified team

Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy Phillips' Milk of Magnesia Liquid online in the UK?

You can buy Phillips' Milk of Magnesia Liquid Traditional Mint Flavour 200ml directly from Cured Pharmacy, a GPhC-registered UK online pharmacy, for £6.59. It's available without a prescription and dispatched quickly to your door. No need to visit a high street pharmacy — ordering online is straightforward and discreet.

How does milk of magnesia liquid work in the body?

Magnesium hydroxide works as an osmotic laxative by drawing water into the large intestine, which softens the stool and stimulates the bowel to move. At lower doses, it neutralises excess stomach acid, providing relief from indigestion and heartburn. It does not irritate the bowel wall directly, which distinguishes it from stimulant laxatives like senna.

How do I use Phillips' Milk of Magnesia step by step?

Shake the bottle well before each use, then measure your dose carefully using the measuring cup. Swallow the liquid and follow it immediately with a full glass of water to help it work effectively. Do not take more than the recommended dose, and do not use for longer than 7 consecutive days without speaking to a pharmacist or GP.

What is the correct dose of Phillips' Milk of Magnesia for adults?

For constipation in adults and children aged 12 and over, the usual dose is 30–45ml taken as a single dose, ideally at bedtime. For indigestion or heartburn, a lower dose of 5–15ml can be taken up to four times daily between meals. Always follow the label instructions and never exceed the stated dose.

How long does Phillips' Milk of Magnesia take to work?

For constipation relief, Phillips' Milk of Magnesia typically produces a bowel movement within 30 minutes to 6 hours of taking the dose. The exact timing varies between individuals and depends on the dose taken. If no bowel movement occurs within 6 hours, do not take an additional dose without first speaking to a pharmacist.

Can I take Phillips' Milk of Magnesia during pregnancy?

You should always speak to your doctor or midwife before using any laxative during pregnancy, including milk of magnesia liquid. While magnesium hydroxide is not absorbed significantly into the bloodstream, self-treating constipation in pregnancy without professional guidance is not recommended. Your GP or midwife can advise on the safest options for you.

Is Phillips' Milk of Magnesia safe for children?

Phillips' Milk of Magnesia can be used in children aged 3 years and over, but the dose must be adjusted for age and weight. Children under 3 years should not use this product. For children aged 3–11 years, it is advisable to seek pharmacist guidance before use to confirm the appropriate dose.

What are the side effects of Phillips' Milk of Magnesia?

The most common side effects are diarrhoea, stomach cramps, and nausea — these are usually dose-related and settle once you stop taking the product. Less commonly, prolonged use can affect magnesium levels in the blood, particularly in people with kidney problems. If you experience severe abdominal pain or persistent symptoms, stop use and consult your GP.

Can Phillips' Milk of Magnesia interact with other medicines?

Yes — magnesium hydroxide can reduce the absorption of several medicines, including tetracycline antibiotics, iron supplements, digoxin, bisphosphonates, and some antifungal medicines. To avoid this, take Phillips' Milk of Magnesia at least 2 hours before or after any other medicines. Always check with your pharmacist if you are unsure.

How long can you use Phillips' Milk of Magnesia for?

This product should not be used for more than 7 consecutive days without seeking medical advice. Long-term or excessive use of laxatives can lead to dependence, electrolyte imbalance, and reduced bowel function. If constipation persists beyond a week, speak to your GP to rule out an underlying cause. You can also browse our constipation treatments for alternative options.

What is the best time to take Phillips' Milk of Magnesia for constipation?

For constipation, the recommended time is at bedtime so that the laxative effect occurs the following morning. Taking it with a full glass of water helps the osmotic mechanism work more effectively. Avoid taking it immediately before or after other medicines — leave at least a 2-hour gap.

What happens if I miss a dose of Phillips' Milk of Magnesia?

If you forget to take a dose, simply take it when you remember — unless it is nearly time for your next dose, in which case skip the missed one. Do not double up doses to compensate. Because this product is used short-term and as needed, missing a single dose is unlikely to cause any significant issue.

What are the alternatives to Phillips' Milk of Magnesia for constipation?

Alternatives include bulk-forming laxatives such as ispaghula husk (e.g. Fybogel), stimulant laxatives such as senna, and other osmotic agents such as lactulose or macrogol (e.g. Movicol). The right choice depends on your symptoms, age, and any other medicines you take. Explore our full range of constipation treatments to find the most suitable option.

Who should not use Phillips' Milk of Magnesia?

This product is not suitable for children under 3 years, people with kidney disease, or those with a known bowel obstruction or unexplained abdominal pain. People on a low-magnesium diet or those with a known allergy to magnesium hydroxide should also avoid it. Always read the label carefully and consult a pharmacist if you are unsure whether this product is right for you.

What are the latest findings on magnesium hydroxide as a laxative?

Magnesium hydroxide remains a well-established and widely recommended osmotic laxative in current NHS and BNF guidance for short-term constipation relief. It is considered safe and effective when used as directed for up to 7 days. No significant new safety concerns have emerged in recent clinical literature, and it continues to be a first-line option for occasional constipation in adults and older children.

How Should You Use Phillips' Milk of Magnesia Liquid?

Always read the label before use and follow the dosage instructions carefully. Shake the bottle thoroughly before each use to ensure the suspension is evenly mixed — the active ingredient can settle at the bottom between uses.

What Is the Correct Dose of Phillips' Milk of Magnesia Liquid?

The dose varies depending on whether you are treating constipation or indigestion, and on the age of the person taking it. Never exceed the maximum stated dose, and always leave at least 2 hours between this product and any other medicines you take regularly.

When Is the Best Time to Use Phillips' Milk of Magnesia Liquid?

For constipation, taking the dose at bedtime is generally recommended so that the laxative effect occurs naturally the following morning. This timing tends to be more convenient and less disruptive to your daily routine. For indigestion or heartburn, take the product between meals and at bedtime — not immediately before or after food, as this can affect how well it works.

Avoid taking this product at the same time as other medicines. A 2-hour gap before or after other medications helps prevent any reduction in their absorption.

How Long Can You Use Phillips' Milk of Magnesia Liquid For?

This product is intended for short-term use only. Do not use it for more than 7 consecutive days without seeking advice from your GP or pharmacist. Prolonged use of laxatives — even osmotic ones — can lead to dependence, reduced natural bowel function, and electrolyte imbalance over time.

If your constipation or indigestion symptoms persist beyond 7 days, or if they worsen at any point, stop using the product and consult a healthcare professional. Persistent symptoms may indicate an underlying condition that requires proper investigation and treatment.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

What Are the Most Common Side Effects of Phillips' Milk of Magnesia Liquid?

Most people tolerate Phillips' Milk of Magnesia well when used at the recommended dose for a short period. However, some people do experience side effects, and these are usually dose-related — meaning they are more likely if you take more than the recommended amount.

  • Diarrhoea — the most frequently reported effect, particularly with higher laxative doses
  • Stomach cramps or abdominal discomfort
  • Nausea
  • Flatulence or bloating

What Are the Less Common Side Effects of Phillips' Milk of Magnesia Liquid?

Less common side effects tend to occur with prolonged use or in people who have reduced kidney function, as the kidneys are responsible for excreting excess magnesium from the body. If you have any kidney problems, speak to your GP before using this product.

  • Elevated blood magnesium levels (hypermagnesaemia) — symptoms can include flushing, low blood pressure, and muscle weakness
  • Electrolyte imbalance with long-term overuse
  • Fatigue or general weakness if magnesium levels become significantly raised
  • Reduced bowel responsiveness if used habitually over a long period

What Are the Serious Side Effects of Phillips' Milk of Magnesia Liquid?

Serious side effects are rare when this product is used correctly and for no longer than 7 days. However, you should stop using it immediately and seek urgent medical attention if you experience any of the following:

  • Severe or worsening abdominal pain
  • Vomiting that does not settle
  • No bowel movement after taking the laxative dose
  • Signs of a serious allergic reaction — including rash, swelling of the face or throat, or difficulty breathing
  • Muscle paralysis or extreme weakness (a sign of very high magnesium levels — rare but serious)

What Should You Do If You Experience Side Effects?

If you develop mild side effects such as loose stools or stomach cramps, reducing the dose or stopping the product usually resolves the problem quickly. Drinking plenty of water can also help manage mild digestive discomfort. For anything more concerning — particularly if symptoms are severe or do not improve — contact your pharmacist or GP promptly. Do not simply increase the dose in an attempt to speed up results.

Can Phillips' Milk of Magnesia Interact With Other Medicines?

Yes. Magnesium hydroxide can interfere with the absorption of several medicines if taken at the same time. This is particularly relevant for tetracycline antibiotics, iron supplements, digoxin, bisphosphonates, and some antifungal medicines. To minimise this risk, always take Phillips' Milk of Magnesia at least 2 hours before or after any other medicines. If you are on regular prescribed medication, check with your pharmacist before starting this product.

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

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