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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 constipation with results in as little as 30 minutes
  • ✔️ Neutralises excess stomach acid to ease indigestion and heartburn
  • ✔️ Gentle osmotic action — does not irritate the bowel lining
  • ✔️ Pleasant mint flavour makes liquid doses easier to take
  • ✔️ Suitable for adults and children aged 12 and over

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

 

If you've ever dealt with the discomfort of constipation or the burning sensation of indigestion, you'll know how much it can disrupt your day. Milk of magnesia liquid has been a trusted household remedy for generations — and Phillips' Traditional Mint Flavour 200ml brings that same reliable relief in a pleasant, easy-to-swallow format. Available over the counter without a prescription, it's a practical option for adults and older children who need fast-acting digestive support. You can also browse our wider range of indigestion remedies if you're looking for additional options.

The active ingredient is magnesium hydroxide, a well-established compound used in medicine for decades. It works both as an osmotic laxative and as an antacid, making it one of the few OTC products that can address two common digestive complaints at once. The mint flavour makes it considerably more palatable than unflavoured versions, which is a genuine bonus if you find liquid medicines difficult to take.

 

How Does Phillips' Milk of Magnesia Work in the Body?

 

Understanding how a medicine works helps you use it more confidently. Phillips' Milk of Magnesia acts through two distinct mechanisms depending on the condition you're treating:

  • As a laxative: Magnesium hydroxide draws water into the large intestine by osmosis. This increases the water content of the stool, softening it and stimulating peristalsis — the muscular contractions that move waste through the bowel.
  • As an antacid: When taken in smaller doses, magnesium hydroxide neutralises excess hydrochloric acid in the stomach. This raises gastric pH and reduces the burning sensation associated with heartburn and indigestion.
  • Onset of action: For constipation, expect a bowel movement within 30 minutes to 6 hours. Antacid effects tend to be more immediate.

It's worth noting that this is not a stimulant laxative — it doesn't irritate the bowel lining. That makes it a gentler choice for many people compared to senna-based products.

 

Who Is Phillips' Milk of Magnesia Suitable For?

 

This product is suitable for a broad range of people, but it isn't right for everyone. It's generally appropriate for:

  • Adults and children aged 12 and over experiencing occasional constipation
  • Adults seeking short-term relief from indigestion or heartburn
  • People who prefer a liquid formulation over tablets or capsules
  • Those who want a mint-flavoured option for improved palatability

It is not recommended for children under 3 years of age. People with kidney disease should exercise particular caution, as impaired kidneys may struggle to excrete excess magnesium, potentially leading to hypermagnesaemia. Always check with your pharmacist if you're unsure whether this product is right for you.

 

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

 

Feature Phillips' Milk of Magnesia Lactulose Syrup
Active ingredient Magnesium hydroxide Lactulose
Mechanism Osmotic laxative + antacid Osmotic laxative only
Onset of action 30 minutes – 6 hours 24–48 hours
Also treats indigestion? Yes No

 

Is Phillips' Milk of Magnesia Safe to Store at Home?

 

Yes — storing this product correctly is straightforward. Keep it below 25°C, away from direct sunlight, and do not freeze it. Always store it out of reach of children. Once opened, check the label for any specific in-use storage guidance. If you're managing multiple digestive health products at home, it's worth keeping them organised and checking expiry dates regularly. For those also dealing with bowel-related discomfort, our constipation collection includes a range of complementary products worth exploring.

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; neutralises stomach acid
Effective for Constipation, indigestion, heartburn
Suitable for Adults and children aged 12 and over (laxative); adults (antacid)
Active ingredient Magnesium Hydroxide
Pack size 200ml
UK classification General Sale List (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 and What Is It Used For?

 

Phillips' Milk of Magnesia Liquid Traditional Mint Flavour is an oral suspension containing magnesium hydroxide as its active ingredient. It is used to relieve two common digestive complaints: constipation and acid-related discomfort such as indigestion and heartburn. As an osmotic laxative, it draws water into the bowel to soften stools and encourage a bowel movement. As an antacid, it neutralises excess stomach acid to ease that uncomfortable burning feeling after meals. It is available without a prescription and is classified as a General Sale List (GSL) medicine in the UK.

 

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

 

Before taking this medicine, read the following carefully. There are certain situations where this product may not be appropriate for you.

Do not use Phillips' Milk of Magnesia if you:

  • Are allergic to magnesium hydroxide or any other ingredient in the product
  • Have severe kidney disease or kidney failure
  • Have a bowel obstruction or unexplained abdominal pain
  • Are giving it to a child under 3 years of age
  • Have been told by a doctor to avoid magnesium-containing products

Speak to your doctor or pharmacist before use if you:

  • Have any kidney problems (even mild)
  • Are pregnant or breastfeeding
  • Have a long-term bowel condition such as inflammatory bowel disease
  • Have not had a bowel movement for more than 7 days

Known drug interactions — this product may affect or be affected by:

  • Tetracycline antibiotics (e.g. doxycycline) — magnesium can reduce their absorption
  • Iron supplements — take at least 2 hours apart
  • Some antifungal medicines (e.g. itraconazole, ketoconazole)
  • Certain heart medicines and bisphosphonates

If you are taking any prescription medicines, always check with your pharmacist before starting this product. You might also find it helpful to explore our IBS and cramps collection if your digestive symptoms are more complex.

 

How Should You Use Phillips' Milk of Magnesia?

 

Always follow the dosage instructions on the label. Shake the bottle well before each use. Use the measuring cup or spoon provided to ensure accuracy — do not estimate.

  1. Shake the bottle thoroughly before opening.
  2. Measure the correct dose using the provided measuring device.
  3. Take the dose orally, either neat or mixed with a small amount of water.
  4. Drink a full glass of water after taking the dose — this helps the medicine work effectively.
  5. For constipation, take the dose at bedtime for best results.
  6. Do not take more than the recommended dose in any 24-hour period.
Indication Age Group Dose Frequency
Constipation Adults & children 12+ 30–45ml Once daily (at bedtime)
Constipation Children 3–11 years Seek pharmacist advice As directed
Indigestion / heartburn Adults 5–15ml Up to 4 times daily

 

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

 

Like all medicines, Phillips' Milk of Magnesia can cause side effects, although not everyone experiences them. Most side effects are mild and resolve on their own.

Common side effects:

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

Less common side effects:

  • Electrolyte imbalance (with prolonged use) — including low phosphate or calcium levels
  • Hypermagnesaemia (raised magnesium levels) — more likely in people with kidney problems; symptoms include muscle weakness, confusion, or irregular heartbeat
  • Dependence on laxatives if used long-term

Stop taking this medicine and seek medical advice immediately if you experience signs of a serious allergic reaction, such as swelling of the face, lips, or throat, difficulty breathing, or a severe rash. If you're also managing sickness alongside constipation, our sickness and nausea collection may be useful.

 

How Should You Store Phillips' Milk of Magnesia?

 

  • Store below 25°C in a cool, dry place
  • Do not freeze the product
  • Keep away from direct sunlight and heat sources
  • Keep the bottle tightly closed when not in use
  • Store out of sight and reach of children
  • Do not use after the expiry date printed on the label
  • Do not dispose of medicines via wastewater or household waste — return unused medicine to your pharmacist

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 for £6.59, with no prescription required. It is a General Sale List medicine, meaning it is legally available to purchase without visiting a GP or pharmacy in person. Simply add it to your basket and it will be dispatched to your door.

How does milk of magnesia liquid work in the body?

Milk of magnesia liquid contains magnesium hydroxide, which works as an osmotic laxative by drawing water into the large intestine, softening the stool and triggering bowel contractions. When taken in smaller doses, it also neutralises excess stomach acid, making it effective for indigestion and heartburn. It does not irritate the bowel lining, which makes it a gentler option compared to stimulant laxatives.

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

For constipation, Phillips' Milk of Magnesia typically produces a bowel movement within 30 minutes to 6 hours of taking the dose. Taking it at bedtime often means results occur the following morning. Individual response times can vary depending on the severity of constipation and the dose taken.

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 in adults, a smaller dose of 5–15ml up to four times daily is typically used. Always follow the label instructions and do not exceed the stated dose.

Can I take Phillips' Milk of Magnesia every day?

Phillips' Milk of Magnesia is intended for short-term use only and should not be taken for more than 7 consecutive days without speaking to a doctor or pharmacist. Prolonged daily use can lead to electrolyte imbalances, low phosphate levels, and laxative dependency. If your constipation is persistent, it is important to seek medical advice to identify any underlying cause.

Is Phillips' Milk of Magnesia safe to use during pregnancy?

You should always speak to your doctor or midwife before using any laxative or antacid during pregnancy, including milk of magnesia liquid. While magnesium hydroxide is sometimes considered for short-term use, professional guidance is essential to ensure it is safe for you and your baby. There may be more suitable alternatives depending on your stage of pregnancy.

Can children use Phillips' Milk of Magnesia?

Phillips' Milk of Magnesia is not recommended for children under 3 years of age. For children aged 3 to 11, you should seek specific advice from a pharmacist or GP before use, as dosing in this age group requires careful consideration. Children aged 12 and over can use the adult laxative dose under appropriate supervision.

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 resolve when the dose is reduced or stopped. Less commonly, prolonged use can cause electrolyte disturbances or raised magnesium levels (hypermagnesaemia), particularly in people with kidney problems. Stop use and contact your pharmacist or GP if you experience muscle weakness, confusion, or an irregular heartbeat.

How do I manage side effects of Phillips' Milk of Magnesia?

If you experience diarrhoea or stomach cramps, try reducing the dose slightly and ensure you are drinking plenty of water. Avoid taking more than the recommended amount, as higher doses increase the likelihood of side effects. If symptoms are severe or do not improve, stop taking the product and speak to your pharmacist or GP.

Does milk of magnesia interact with other medicines?

Yes — magnesium hydroxide can reduce the absorption of certain medicines, including tetracycline antibiotics (such as doxycycline), iron supplements, some antifungal medicines, and certain heart medications. To minimise interactions, take Phillips' Milk of Magnesia at least 2 hours before or after other medicines. Always inform your pharmacist of all medicines you are taking before starting this product.

Who should not use Phillips' Milk of Magnesia?

This product is not suitable for people with severe kidney disease, a known bowel obstruction, or unexplained abdominal pain. It should also be avoided by anyone with a known allergy to magnesium hydroxide. People with mild to moderate kidney problems should seek medical advice before use, as magnesium can accumulate in the body if the kidneys are not functioning normally.

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

Common alternatives include lactulose (a slower-acting osmotic laxative), ispaghula husk (Fybogel, a bulk-forming laxative), senna (a stimulant laxative), and macrogol-based products such as Movicol. You can explore a range of options in our constipation collection. The most appropriate choice depends on the cause and duration of your symptoms, so speak to a pharmacist if you are unsure.

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

Because Phillips' Milk of Magnesia is taken on an as-needed basis rather than as a regular scheduled medicine, missing a dose is not typically a concern. Simply take it when you need it, following the label instructions. Do not double up on doses to compensate for a missed one.

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

This product is intended for short-term use only — no more than 7 consecutive days for constipation. If your symptoms have not improved after this period, or if they return frequently, you should speak to your GP to rule out an underlying condition. Persistent constipation may benefit from dietary changes, increased fluid intake, and regular physical activity alongside any short-term treatment.

Is Phillips' Milk of Magnesia the same as an antacid?

Yes — at lower doses, Phillips' Milk of Magnesia acts as an antacid by neutralising excess stomach acid, providing relief from indigestion and heartburn. At higher doses, it functions primarily as an osmotic laxative. This dual action makes it a versatile product, though you should always use the dose appropriate for the condition you are treating. If you regularly experience indigestion, our indigestion collection has further options to consider.

How Should You Use Phillips' Milk of Magnesia Liquid?

Always read the label carefully before use and follow the instructions provided. Shake the bottle well before each dose to ensure the suspension is evenly mixed. Use the measuring cup or spoon supplied with the product — never estimate the dose by eye, as accuracy matters with liquid medicines.

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

The dose varies depending on whether you are using this product as a laxative or as an antacid. Always use the lowest effective dose and do not exceed the maximum stated on the label. The table below provides a general guide — always defer to the product label for the most accurate information.

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

For constipation, taking the dose at bedtime is generally recommended, as this allows the medicine to work overnight and produce a bowel movement the following morning. For indigestion or heartburn, take the dose after meals and at bedtime, or whenever symptoms occur. Avoid taking it at the same time as other medicines — leave at least 2 hours between this product and any other medication to prevent interactions.

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

This product is designed for short-term use only. Do not use it for more than 7 consecutive days without seeking advice from a doctor or pharmacist. If your constipation or indigestion symptoms persist beyond this period, or if they recur frequently, it is important to speak to your GP to identify any underlying cause. Long-term dietary changes — such as increasing fibre and fluid intake and staying physically active — are the most sustainable approach to managing constipation.

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?

Most people tolerate Phillips' Milk of Magnesia well when used as directed, but some side effects can occur. The most common ones are usually dose-related, meaning they are more likely if you take more than the recommended amount.

  • Diarrhoea — particularly with higher laxative doses
  • Stomach cramps or abdominal discomfort
  • Nausea
  • Loose or watery stools

If you experience diarrhoea, try reducing the dose slightly and ensure you are drinking plenty of fluids to stay hydrated. These effects typically resolve once the medicine has worked or the dose is adjusted.

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

Less common side effects are more likely to occur with prolonged or excessive use. They are particularly relevant for people with kidney problems, as the kidneys are responsible for excreting excess magnesium from the body.

  • Low blood phosphate levels (hypophosphataemia) — may cause fatigue, bone pain, or muscle weakness
  • Low calcium levels (hypocalcaemia) — symptoms include muscle cramps or tingling
  • Laxative dependency with long-term use
  • Changes in bowel habit after stopping the medicine

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

Serious side effects are rare but can occur, particularly in people with impaired kidney function. Hypermagnesaemia — a build-up of magnesium in the blood — is the most significant risk. Symptoms to watch for include:

  • Muscle weakness or loss of reflexes
  • Confusion or drowsiness
  • Irregular or slow heartbeat
  • Difficulty breathing
  • Low blood pressure

If you experience any of these symptoms, stop taking the product immediately and seek urgent medical attention.

What Should You Do If You Experience Side Effects?

For mild side effects such as diarrhoea or stomach cramps, reducing the dose and increasing your fluid intake is usually sufficient. If side effects are persistent, worsening, or causing significant discomfort, stop using the product and speak to your pharmacist or GP. In the case of a suspected allergic reaction — such as swelling of the face, lips, or throat, difficulty breathing, or a severe skin rash — seek emergency medical help immediately.

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. To reduce the risk of interactions, take Phillips' Milk of Magnesia at least 2 hours before or after any other medicines. Known interactions include tetracycline antibiotics (such as doxycycline), iron supplements, certain antifungal medicines (such as itraconazole), bisphosphonates, and some heart medicines. Always inform your pharmacist of everything you are currently taking 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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