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Original Andrews Salts 150g

Original Andrews Salts 150g

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  • ✔️ Relieves constipation and indigestion with one dose
  • ✔️ Dual-action formula targets both bowel and stomach symptoms
  • ✔️ Osmotic laxative action softens stools gently and effectively
  • ✔️ Suitable for adults and children aged 12 and over
  • ✔️ Effervescent powder format — easy to dissolve and drink

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What Is Andrews Salts Constipation Relief?

 

If you've ever dealt with that uncomfortable, sluggish feeling that comes with constipation or a bloated stomach after a heavy meal, you'll know how much it can affect your day. Andrews Salts constipation relief has been a trusted household name in the UK for generations, offering a dual-action effervescent powder that tackles both constipation and indigestion in one simple dose. Each 150g tub contains enough for multiple uses, making it a practical addition to your medicine cabinet. You can browse our full range of constipation remedies if you'd like to compare your options before deciding.

The product works as both a laxative and an antacid, which is what sets it apart from single-action remedies. It's taken dissolved in water, producing a pleasant effervescent drink that's easy to swallow — no tablets to choke on, no unpleasant aftertaste.

 

How Does Original Andrews Salts Work?

 

Andrews Salts contains three active ingredients, each playing a distinct role:

  • Magnesium sulphate — acts as an osmotic laxative, drawing water into the large intestine to soften stools and encourage a bowel movement
  • Sodium bicarbonate — an antacid that neutralises excess stomach acid, easing heartburn and indigestion
  • Citric acid — reacts with sodium bicarbonate to produce the characteristic fizz, and also contributes to the antacid effect

Together, these ingredients address two of the most common digestive complaints. The osmotic action of magnesium sulphate is well established — it doesn't stimulate the bowel wall directly but instead increases the water content of the stool, making it easier to pass. This is generally considered a gentler mechanism than stimulant laxatives.

 

Who Should Use Original Andrews Salts?

 

Andrews Salts is suitable for adults and children aged 12 and over who are experiencing occasional constipation, indigestion, or both. It's particularly useful when symptoms occur together — for example, after overindulging at a meal. That said, it's not intended for long-term daily use.

It may be appropriate for you if you:

  • Have occasional, short-term constipation not caused by an underlying condition
  • Experience indigestion, heartburn, or acid discomfort after eating
  • Prefer a liquid effervescent format over tablets or capsules
  • Need a remedy that addresses both digestive complaints simultaneously

 

How Does Andrews Salts Compare to Other Constipation Remedies?

 

Feature Original Andrews Salts Lactulose Solution
Mechanism Osmotic laxative + antacid Osmotic laxative only
Also treats indigestion? Yes No
Format Effervescent powder Liquid syrup
Suitable for children? 12 years and over All ages (dose varies)

 

Is Andrews Salts Suitable for Everyone, and How Should It Be Stored?

 

Not everyone can use Andrews Salts safely. Because it contains sodium, it is not suitable for people on a low-sodium diet or those with kidney disease, as magnesium can accumulate in the body when kidney function is impaired. Pregnant or breastfeeding women should always check with their GP or pharmacist before use. If you're managing other digestive conditions, our IBS and cramps collection may also be worth exploring alongside this product.

Store the tub below 25°C in a dry place, away from direct sunlight, and always keep the lid tightly closed after use to prevent moisture from affecting the powder. Andrews Salts constipation relief should be kept out of the sight and reach of children.

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.

Original Andrews Salts 150g specifications
Treatment category Constipation & Indigestion
Mechanism of action Osmotic laxative and antacid
Effective for Occasional constipation, indigestion, heartburn
Suitable for Adults and children aged 12 and over
Active ingredients Magnesium sulphate, Sodium bicarbonate, Citric acid
Pack size 150g
UK classification General Sale List (GSL)
Drug class Osmotic laxative / Antacid
Preparation Effervescent powder
Route of administration Oral

Specifications of Original Andrews Salts 150g

 

What Is Original Andrews Salts and What Is It Used For?

 

Original Andrews Salts is an over-the-counter effervescent powder used to relieve occasional constipation and indigestion. It contains three active ingredients — magnesium sulphate, sodium bicarbonate, and citric acid — which work together to soften stools and neutralise excess stomach acid. It is classified as a General Sale List (GSL) medicine in the UK, meaning it can be purchased without a prescription. Andrews Salts constipation relief is intended for short-term use only and should not replace dietary or lifestyle changes for managing long-term digestive health.

 

What Do You Need to Know Before Using Original Andrews Salts?

 

Before using this product, read the following carefully. Some people should not use Andrews Salts, and others may need to take extra care.

Do not use Andrews Salts if you:

  • Are allergic to any of the active or inactive ingredients
  • Have kidney disease or severely impaired kidney function
  • Are following a low-sodium or low-magnesium diet on medical advice
  • Are giving it to a child under 12 years of age without medical supervision
  • Have been told by a doctor to avoid laxatives

Speak to your doctor or pharmacist before use if you:

  • Are pregnant or breastfeeding
  • Have heart disease or high blood pressure
  • Have any long-term bowel condition such as Crohn's disease or ulcerative colitis
  • Have unexplained changes in bowel habits lasting more than two weeks

Known drug interactions — Andrews Salts may affect the absorption or effectiveness of:

  • Tetracycline antibiotics (e.g. doxycycline) — take at least two hours apart
  • Iron supplements — magnesium can reduce iron absorption
  • Some medicines for heart conditions or epilepsy — seek pharmacist advice

 

How Should You Use Original Andrews Salts?

 

Always use this product exactly as described on the label or as directed by your pharmacist. Do not exceed the stated dose.

  1. Measure one level teaspoonful (approximately 5g) of the powder
  2. Pour into half a glass of water (approximately 100–150ml)
  3. Stir well until the powder is fully dissolved and the fizzing has settled slightly
  4. Drink the solution while it is still effervescing for best effect
  5. Take once daily, preferably in the morning
Indication Age Group Dose Frequency
Constipation / Indigestion Adults & children 12+ 1 level teaspoon (~5g) in water Once daily
Children under 12 Under 12 years Not recommended without medical advice

If you are also experiencing symptoms that might be related to IBS or persistent cramping, it is worth exploring our indigestion collection for additional support options.

 

What Are the Possible Side Effects of Original Andrews Salts?

 

Like all medicines, Andrews Salts can cause side effects, although not everyone experiences them. Most side effects are related to taking too high a dose.

Common side effects:

  • Loose stools or diarrhoea (usually if the dose is exceeded)
  • Stomach cramps or abdominal discomfort
  • Flatulence or bloating

Less common side effects:

  • Nausea
  • Electrolyte imbalance with prolonged use (particularly in people with kidney problems)
  • Hypermagnesaemia (raised magnesium levels) — rare, but possible with excessive or long-term use

Stop using Andrews Salts and seek medical advice if you experience severe abdominal pain, blood in your stools, or symptoms that worsen rather than improve. These could indicate a more serious underlying condition that needs investigation.

 

How Should You Store Original Andrews Salts?

 

Correct storage helps maintain the product's effectiveness and safety. Follow these instructions:

  • Store below 25°C in a cool, dry place
  • Keep away from direct sunlight and sources of heat
  • Always replace the lid firmly after each use to prevent moisture absorption
  • Keep out of the sight and reach of children
  • Do not use after the expiry date printed on the tub
  • Do not store in a bathroom or near a sink — humidity can cause the powder to clump

If you notice the powder has changed colour, developed an unusual smell, or clumped together significantly, do not use it. Dispose of it safely via your local pharmacy's medicine return scheme. You can also find related digestive health products in our haemorrhoids and piles collection, as constipation is a common contributing factor to that condition.

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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 Andrews Salts 150g online in the UK?

You can buy Original Andrews Salts 150g directly from Cured Pharmacy, a GPhC-registered UK online pharmacy. It is available without a prescription as a General Sale List medicine. Simply add it to your basket and it will be dispatched to your door.

How does Andrews Salts work in the body?

Andrews Salts contains magnesium sulphate, which acts as an osmotic laxative by drawing water into the large intestine to soften stools and encourage a bowel movement. Sodium bicarbonate and citric acid react together to neutralise excess stomach acid, relieving indigestion and bloating. This dual action makes it useful when both complaints occur at the same time.

How do I use Andrews Salts step by step?

Measure one level teaspoonful (approximately 5g) of the powder and dissolve it in half a glass of water, stirring well. Drink the solution while it is still effervescing for the best effect. Take once daily, and do not exceed the recommended dose without speaking to a pharmacist.

What is the correct dose of Andrews Salts for adults?

The standard adult dose is one level teaspoonful (approximately 5g) dissolved in half a glass of water, taken once daily. This applies to adults and children aged 12 and over. Do not take more than one dose per day unless specifically advised by a healthcare professional.

When is the best time to take Andrews Salts?

Andrews Salts is generally best taken in the morning, before or after breakfast, so that the laxative effect can work during the day. If you are taking it primarily for indigestion, you can take it after a meal when symptoms arise. Always follow the label instructions and do not exceed one dose per day.

What are the side effects of Andrews Salts and how do I manage them?

The most common side effects are loose stools, diarrhoea, and stomach cramps, which usually occur if the dose is too high. Reducing to the recommended dose typically resolves these symptoms. If side effects persist or you experience severe abdominal pain, stop use and speak to your pharmacist or GP.

Who should not use Andrews Salts?

Andrews Salts is not suitable for people with kidney disease, those on a medically supervised low-sodium diet, or children under 12 years without medical advice. Pregnant or breastfeeding women should consult their doctor before use. People with long-term bowel conditions such as Crohn's disease should also seek medical guidance first.

Can I use Andrews Salts if I am pregnant?

You should speak to your GP or midwife before using Andrews Salts during pregnancy, as the sodium content and laxative effect may not be appropriate for all pregnant women. There are alternative laxatives considered safer in pregnancy, such as lactulose, which your doctor can advise on. Do not self-treat constipation in pregnancy without professional guidance.

Does Andrews Salts interact with other medicines?

Yes, Andrews Salts can interact with certain medicines. It may reduce the absorption of tetracycline antibiotics and iron supplements, so these should be taken at least two hours apart. If you are taking medicines for heart conditions, epilepsy, or any other long-term condition, speak to your pharmacist before use.

How long can you use Andrews Salts for?

Andrews Salts should not be used for more than 7 consecutive days without consulting a doctor. Prolonged use of laxatives can lead to dependence and electrolyte imbalances. If constipation persists beyond one week, it may indicate an underlying condition that requires medical assessment.

What are the alternatives to Andrews Salts for constipation?

Common alternatives include lactulose solution, ispaghula husk (such as Fybogel), senna tablets, and glycerol suppositories. You can explore our full constipation range to compare options. Your pharmacist can help you choose the most appropriate product based on your symptoms and medical history.

Is Andrews Salts the same as Andrews Liver Salts?

Yes — Original Andrews Salts is the same product historically known as Andrews Liver Salts; the name was updated over time but the formulation remains the same. It contains magnesium sulphate, sodium bicarbonate, and citric acid. The product continues to be used for the same indications: constipation and indigestion.

Can Andrews Salts be used for indigestion alone?

Yes, Andrews Salts can be used specifically for indigestion and heartburn, even if constipation is not present. The sodium bicarbonate and citric acid combination acts as an antacid to neutralise excess stomach acid. If indigestion is a frequent problem, it is worth speaking to your GP, as persistent symptoms may need further investigation. You can also browse our indigestion collection for additional remedies.

What happens if I take too much Andrews Salts?

Taking more than the recommended dose can cause diarrhoea, stomach cramps, and in rare cases, electrolyte imbalances such as raised magnesium levels (hypermagnesaemia). If you accidentally take too much, drink plenty of water and seek advice from a pharmacist or call NHS 111. Do not take a second dose to compensate for a missed one.

What are the latest findings on osmotic laxatives like Andrews Salts?

Osmotic laxatives, including magnesium sulphate-based products, are well established in clinical guidelines for the short-term management of constipation. The NHS recommends osmotic laxatives as a first-line option when dietary and lifestyle changes have not been sufficient. They are generally considered safe for short-term use in adults when taken at the recommended dose.

How Should You Use Original Andrews Salts?

Using Andrews Salts correctly ensures you get the most from each dose while minimising the risk of side effects. Always read the label before use and follow these steps carefully.

Do not mix Andrews Salts with juice or other drinks, as this may affect how the ingredients work. Drink a full glass of water alongside your dose to help the laxative effect work more comfortably.

What Is the Correct Dose of Original Andrews Salts?

The dose varies depending on age. Always stick to the recommended amount — taking more will not speed up results and may cause unwanted side effects such as diarrhoea or stomach cramps.

If you are unsure whether the dose is appropriate for your situation — for example, if you are elderly, have a kidney condition, or are taking other medicines — speak to your pharmacist before use.

When Is the Best Time to Use Original Andrews Salts?

For constipation, Andrews Salts is generally most effective when taken in the morning, either before or shortly after breakfast. This allows the osmotic laxative effect to work during waking hours, which is more comfortable and practical. If you are using it primarily for indigestion or heartburn, you can take it after a meal when symptoms arise, as the antacid effect works relatively quickly.

Try to take it at a consistent time each day if you are using it on consecutive days, and always ensure you are well hydrated throughout the day to support the laxative action.

How Long Can You Use Original Andrews Salts For?

Andrews Salts is intended for short-term use only. Do not use it for more than 7 consecutive days without consulting a doctor or pharmacist. Prolonged use of laxatives — even osmotic ones — can lead to your bowel becoming reliant on them, and may cause electrolyte imbalances over time.

If your constipation has not improved after 7 days, or if you notice blood in your stools, unexplained weight loss, or a significant change in your normal bowel habits, stop use and seek medical advice promptly. These symptoms may indicate an underlying condition that requires investigation rather than self-treatment.

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

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What Are the Most Common Side Effects of Original Andrews Salts?

Most people tolerate Andrews Salts well when taken at the recommended dose. However, some individuals do experience side effects, particularly if the dose is exceeded. The most common issues are related to the laxative action of magnesium sulphate.

  • Loose stools or diarrhoea
  • Stomach cramps or abdominal discomfort
  • Flatulence or bloating
  • Urgency to use the toilet

These effects are usually mild and resolve on their own once the dose is reduced or the product is stopped. Drinking plenty of water can help ease abdominal discomfort.

What Are the Less Common Side Effects of Original Andrews Salts?

Less commonly, some people may experience side effects that are not directly related to the laxative effect. These are more likely to occur with prolonged use or in people with underlying health conditions.

  • Nausea or feeling sick
  • Electrolyte imbalance — particularly low potassium or raised magnesium levels with extended use
  • Hypermagnesaemia (abnormally high magnesium in the blood) — rare, but more likely in people with kidney problems
  • Fluid retention due to sodium content — relevant for those on low-sodium diets

If you notice muscle weakness, confusion, or an irregular heartbeat, these could be signs of an electrolyte imbalance and you should seek medical attention promptly.

What Are the Serious Side Effects of Original Andrews Salts?

Serious side effects are rare when Andrews Salts is used correctly and for short periods. However, you should stop using the product immediately and seek urgent medical advice if you experience any of the following:

  • Severe or persistent abdominal pain
  • Blood in your stools or black, tarry stools
  • Signs of a severe allergic reaction — including rash, swelling of the face or throat, or difficulty breathing
  • Symptoms of hypermagnesaemia — including extreme fatigue, low blood pressure, or difficulty breathing

These symptoms require prompt medical assessment and should not be managed with self-treatment.

What Should You Do If You Experience Side Effects?

If you experience mild side effects such as loose stools or stomach cramps, reduce your dose or stop taking the product and allow symptoms to settle. Make sure you are drinking enough water throughout the day. If side effects are moderate or do not improve within 24–48 hours, contact your pharmacist for advice. For any serious or unexpected symptoms, call NHS 111 or visit your GP without delay.

You can also report suspected side effects directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk.

Can Original Andrews Salts Interact With Other Medicines?

Yes. Andrews Salts can affect how certain other medicines are absorbed or work in the body. The magnesium and sodium bicarbonate content are the main sources of interaction. Known interactions include:

  • Tetracycline antibiotics (e.g. doxycycline, oxytetracycline) — take at least two hours apart from Andrews Salts
  • Iron supplements — magnesium can reduce iron absorption; separate doses by at least two hours
  • Some medicines for heart conditions, epilepsy, or osteoporosis — seek pharmacist advice before combining
  • Other antacids or laxatives — avoid taking simultaneously without professional guidance

Always tell your pharmacist about all medicines, supplements, and herbal products you are taking before starting Andrews Salts.

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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