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Rennie Peppermint

Rennie Peppermint

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  • ✔️ Neutralises excess stomach acid to relieve heartburn fast
  • ✔️ Chewable peppermint tablet for quick, convenient relief
  • ✔️ Suitable for adults and children aged 12 and over
  • ✔️ Effective for heartburn, indigestion, and acid reflux
  • ✔️ Contains dual antacid action: calcium and magnesium carbonate

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What Are Rennie Peppermint Tablets?

 

If you've ever felt that uncomfortable burning sensation creeping up your chest after a meal, you'll know how disruptive heartburn can be. Rennie Peppermint tablets are a well-established, over-the-counter antacid used to relieve the symptoms of heartburn, indigestion, and acid reflux quickly and effectively. Each tablet contains two active antacid ingredients — calcium carbonate 680 mg and heavy magnesium carbonate 80 mg — which work together to neutralise excess stomach acid. They're available without a prescription and are suitable for most adults and children aged 12 and over.

Heartburn is extremely common in the UK. The NHS notes that most people experience it at some point, often triggered by certain foods, alcohol, pregnancy, or simply eating too much. If you're looking for a reliable, fast-acting option, you'll find Rennie Peppermint tablets alongside other digestive remedies in our indigestion collection.

 

How Do Rennie Peppermint Tablets Work?

 

Rennie Peppermint works through a straightforward chemical process. When you chew or suck a tablet, the active ingredients dissolve and react with the hydrochloric acid in your stomach. This neutralisation reaction raises the pH of your stomach contents, reducing the acidity that causes that burning feeling in your oesophagus.

  • Calcium carbonate reacts with stomach acid to form calcium chloride, water, and carbon dioxide, directly reducing acidity.
  • Heavy magnesium carbonate acts in a similar way, providing a complementary antacid effect that helps sustain relief.
  • The peppermint flavour makes the tablets pleasant to chew, which encourages proper use — chewing rather than swallowing whole ensures faster dissolution and quicker action.
  • Relief typically begins within a few minutes of taking the tablets.

 

Who Should Use Rennie Peppermint Tablets?

 

These tablets are suitable for a wide range of people dealing with occasional digestive discomfort. They're particularly useful if your symptoms are mild to moderate and linked to identifiable triggers like spicy food, alcohol, or eating late at night.

  • Adults aged 18 and over experiencing occasional heartburn or indigestion
  • Young people aged 12–17 (under adult supervision)
  • Pregnant women experiencing heartburn — though always check with your midwife or GP first
  • People who prefer a chewable, flavoured tablet over liquid antacid preparations

They are not suitable for children under 12, and you should not use them as a long-term solution without speaking to a healthcare professional. If symptoms are frequent or severe, your GP may want to investigate further.

 

How Do Rennie Peppermint Tablets Compare to Other Antacids?

 

Feature Rennie Peppermint Gaviscon Advance (Liquid)
Form Chewable tablet Liquid suspension
Active ingredients Calcium carbonate, magnesium carbonate Sodium alginate, potassium bicarbonate
Mechanism Neutralises stomach acid Forms a raft to prevent acid reflux
Suitable for pregnancy Generally yes (seek advice) Generally yes (seek advice)

 

Are Rennie Peppermint Tablets Safe to Store and Use Long Term?

 

Store Rennie Peppermint tablets below 25°C in a dry place, away from direct sunlight and out of reach of children. Check the expiry date on the packaging before use — do not use tablets past their expiry date. If you find yourself reaching for antacids regularly, it's worth speaking to your pharmacist or GP, as persistent symptoms may indicate an underlying condition such as gastro-oesophageal reflux disease (GORD) that warrants further assessment. You might also want to explore our IBS and cramps collection if your digestive symptoms are more complex.

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.

Rennie Peppermint specifications
Treatment category Antacid / Indigestion relief
Mechanism of action Neutralises excess stomach acid
Effective for Heartburn, indigestion, acid reflux
Suitable for Adults and children aged 12 and over
Active ingredient Calcium carbonate 680 mg, Heavy magnesium carbonate 80 mg
Pack sizes 24, 48, 72 tablets
UK classification General Sale List (GSL)
Drug class Antacid
Preparation Chewable tablet
Route of administration Oral

Specifications of Rennie Peppermint

 

What Is Rennie Peppermint and What Is It Used For?

 

Rennie Peppermint is an antacid medicine used to relieve the symptoms of heartburn, acid indigestion, and upset stomach. It contains two active antacid salts — calcium carbonate and heavy magnesium carbonate — which neutralise excess acid produced in the stomach. The peppermint flavouring makes the tablets easy and pleasant to chew. This medicine is classified as a General Sale List (GSL) product in the UK, meaning you can buy it without a prescription from pharmacies, supermarkets, and online retailers.

The NHS describes heartburn as a burning feeling in the chest caused by stomach acid travelling up towards the throat. It's often worse after eating, when lying down, or when bending over. Rennie Peppermint tablets are designed to provide fast, short-term relief from these symptoms.

 

What Do You Need to Know Before Using Rennie Peppermint?

 

Before taking these tablets, it's important to check whether they are appropriate for you. Do not take Rennie Peppermint if any of the following apply:

  • You are allergic to calcium carbonate, magnesium carbonate, or any other ingredient in the tablets
  • You have hypercalcaemia (high levels of calcium in the blood)
  • You have severe kidney disease or kidney failure
  • You have a condition called milk-alkali syndrome
  • Your child is under 12 years of age

Some medicines can interact with antacids. Rennie Peppermint may affect the absorption of other medicines if taken at the same time. Known interactions include:

  • Tetracycline antibiotics (e.g. doxycycline) — take at least 2 hours apart
  • Iron supplements — take at least 2 hours apart
  • Some antifungal medicines (e.g. ketoconazole) — take at least 2 hours apart
  • Bisphosphonates (e.g. alendronic acid) — take at least 2 hours apart
  • Thyroid medicines (e.g. levothyroxine) — take at least 4 hours apart

Always tell your pharmacist or GP about all medicines you are currently taking, including herbal remedies and supplements.

 

How Should You Use Rennie Peppermint?

 

Using Rennie Peppermint correctly ensures you get the most from each dose. Follow these steps:

  1. Take 2 tablets when your symptoms occur.
  2. Chew or suck the tablets — do not swallow them whole.
  3. Allow the tablets to dissolve fully in your mouth before swallowing.
  4. If symptoms return, you may repeat the dose after a few hours.
  5. Do not take more than 16 tablets in any 24-hour period.
  6. If symptoms persist for more than 2 weeks, consult your GP.
Indication Age Group Dose Frequency
Heartburn / indigestion Adults & children 12+ 2 tablets When symptoms occur; max 4 times daily
Heartburn / indigestion Under 12 Not recommended Seek medical advice

 

What Are the Possible Side Effects of Rennie Peppermint?

 

Like all medicines, Rennie Peppermint can cause side effects, although not everyone experiences them. Most people tolerate these tablets well when taken as directed.

Common side effects:

  • Flatulence (wind)
  • Constipation

Less common side effects:

  • Nausea
  • Stomach cramps
  • Rebound acid hypersecretion (increased acid production after stopping the tablets, particularly with prolonged use)
  • Hypercalcaemia (raised blood calcium) — more likely with long-term, high-dose use

If you notice any signs of an allergic reaction — such as a rash, swelling of the face or throat, or difficulty breathing — stop taking the tablets immediately and seek urgent medical attention. You can also explore our sickness and nausea collection if you experience nausea alongside your digestive symptoms.

 

How Should You Store Rennie Peppermint?

 

Correct storage helps maintain the quality and effectiveness of your tablets. Follow these guidelines:

  • Store below 25°C in a dry place
  • Keep away from direct sunlight and moisture
  • Keep out of the sight and reach of children
  • Do not use after the expiry date printed on the packaging
  • Do not store in a bathroom or near a sink — humidity can affect the tablets
  • Dispose of unused or expired tablets safely — your local pharmacy can accept them for disposal

If you're managing multiple digestive health products, it's worth keeping them organised and checking expiry dates regularly. For broader digestive support, you might also find our vitamins and supplements collection useful for maintaining gut health alongside your antacid treatment.

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 Rennie Peppermint tablets online in the UK?

You can buy Rennie Peppermint tablets online from Cured Pharmacy, a GPhC-registered UK online pharmacy, for just £2.68. They are dispatched quickly and do not require a prescription. They are also available from most UK supermarkets and high street pharmacies.

How do Rennie Peppermint tablets work in the body?

Rennie Peppermint tablets contain calcium carbonate and heavy magnesium carbonate, which are antacid salts that neutralise excess hydrochloric acid in the stomach. This raises the stomach's pH and reduces the burning sensation associated with heartburn and indigestion. Relief typically begins within a few minutes of chewing the tablets.

How do I use Rennie Peppermint tablets step by step?

Chew or suck 2 tablets when your symptoms occur — do not swallow them whole. You can repeat the dose if symptoms return, but do not take more than 16 tablets in any 24-hour period. If symptoms persist beyond 2 weeks, speak to your GP.

What is the correct dose of Rennie Peppermint for adults?

The recommended dose for adults and children aged 12 and over is 2 tablets, chewed or sucked, when symptoms occur. This can be repeated up to 4 times daily, but the maximum is 16 tablets in 24 hours. Do not exceed this dose without medical advice.

What are the side effects of Rennie Peppermint tablets?

Most people tolerate Rennie Peppermint well, but some may experience flatulence or constipation. Less commonly, nausea or stomach cramps may occur. If you notice any signs of an allergic reaction, stop taking the tablets and seek medical attention immediately.

Can I take Rennie Peppermint tablets during pregnancy?

Rennie Peppermint is generally considered suitable for use during pregnancy when taken as directed, and the NHS acknowledges antacids as a common remedy for pregnancy-related heartburn. However, you should always speak to your midwife, GP, or pharmacist before taking any medicine during pregnancy. Avoid taking them at the same time as iron supplements, which are commonly prescribed in pregnancy.

How long can I take Rennie Peppermint tablets for?

Rennie Peppermint is intended for short-term, occasional use to relieve heartburn and indigestion symptoms. If you find yourself needing antacids regularly for more than 2 weeks, you should consult your GP, as this may indicate an underlying condition such as GORD that requires further assessment and treatment.

What are the alternatives to Rennie Peppermint tablets?

Alternatives include other antacid products such as Gaviscon (which forms a protective raft over stomach contents) or Tums. For more persistent symptoms, acid-suppressing medicines such as omeprazole or lansoprazole may be appropriate — speak to your pharmacist or GP. You can also browse our indigestion collection for a range of options.

Can children take Rennie Peppermint tablets?

Rennie Peppermint tablets are suitable for children aged 12 and over, taken under adult supervision at the same dose as adults. They are not recommended for children under 12 — if a younger child is experiencing digestive symptoms, seek advice from a GP or pharmacist before giving any antacid medicine.

Do Rennie Peppermint tablets interact with other medicines?

Yes, antacids like Rennie Peppermint can affect the absorption of certain medicines, including tetracycline antibiotics, iron supplements, bisphosphonates, ketoconazole, and levothyroxine. To avoid interactions, take Rennie Peppermint at least 2 hours before or after these medicines. Always inform your pharmacist of all medicines you are taking.

What happens if I take too many Rennie Peppermint tablets?

Taking more than the recommended dose (more than 16 tablets in 24 hours) may cause symptoms such as nausea, vomiting, constipation, or in rare cases, raised blood calcium levels (hypercalcaemia). If you think you or someone else has taken too many tablets, contact NHS 111 or go to your nearest A&E department.

Are Rennie Peppermint tablets suitable for people with kidney problems?

Rennie Peppermint is not recommended for people with severe kidney disease or kidney failure, as the kidneys may not be able to process the calcium and magnesium effectively. If you have any degree of kidney impairment, speak to your GP or pharmacist before taking these tablets.

What is the best time to take Rennie Peppermint tablets?

Take Rennie Peppermint tablets when symptoms occur — there is no fixed time of day. Many people find heartburn is worse after meals, when lying down, or at night, so taking a dose at these times can be particularly helpful. Avoid taking them at the same time as other medicines that may interact.

Can I take Rennie Peppermint tablets on an empty stomach?

Yes, you can take Rennie Peppermint tablets on an empty stomach if you are experiencing symptoms at that time. However, heartburn and indigestion are most commonly triggered by food and drink, so symptoms are more likely to occur after eating. Take the tablets whenever symptoms arise, regardless of whether you have eaten.

What are the latest findings on antacid use for heartburn?

Current NHS guidance continues to recommend antacids such as calcium carbonate as a first-line, short-term treatment for mild to moderate heartburn and indigestion. For frequent or severe symptoms, proton pump inhibitors (PPIs) such as omeprazole are generally more effective for long-term management. If you're also dealing with related digestive issues, our IBS and cramps collection may offer additional support options.

How Should You Use Rennie Peppermint?

Using Rennie Peppermint correctly is straightforward, but it's worth following the steps below to make sure you get the most effective relief. Always read the patient information leaflet supplied with your pack before use.

What Is the Correct Dose of Rennie Peppermint?

The dose of Rennie Peppermint varies slightly depending on age. Always follow the dosage guidance below and never exceed the stated maximum daily dose. Taking more than recommended does not improve symptom relief and may cause unwanted effects.

When Is the Best Time to Use Rennie Peppermint?

Take Rennie Peppermint tablets as soon as heartburn or indigestion symptoms begin — there is no need to wait. Many people find symptoms are worst after eating a large or spicy meal, after drinking alcohol, or when lying down at night. Taking a dose at these predictable trigger points can help you stay comfortable. If you know from experience that certain foods cause symptoms, having your tablets to hand before or shortly after eating can make a real difference.

How Long Can You Use Rennie Peppermint For?

Rennie Peppermint is designed for short-term, occasional use to manage mild to moderate heartburn and indigestion. It is not intended as a long-term daily treatment. If you find that you are relying on antacids most days, or if your symptoms have not improved after 2 weeks of use, you should stop taking the tablets and speak to your GP. Persistent or worsening symptoms may indicate an underlying condition such as gastro-oesophageal reflux disease (GORD) or a peptic ulcer, both of which require proper medical assessment and may need prescription 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 Rennie Peppermint?

Most people who take Rennie Peppermint at the recommended dose do not experience significant side effects. However, as with any medicine, some people may notice mild digestive changes, particularly if they take antacids frequently.

  • Flatulence (wind or bloating)
  • Constipation

What Are the Less Common Side Effects of Rennie Peppermint?

Less commonly, some people may experience the following side effects, particularly with higher doses or prolonged use. If any of these persist or become bothersome, speak to your pharmacist.

  • Nausea
  • Stomach cramps or abdominal discomfort
  • Rebound acid hypersecretion — where the stomach produces more acid after stopping the tablets, particularly following extended use
  • Hypercalcaemia (raised blood calcium levels) — more likely with long-term, high-dose use; symptoms may include nausea, weakness, or confusion
  • Hypermagnesaemia (raised blood magnesium) — rare, but possible in people with kidney impairment

What Are the Serious Side Effects of Rennie Peppermint?

Serious side effects from Rennie Peppermint are rare when the product is used as directed. However, you should be aware of the signs of a serious allergic reaction (anaphylaxis), which — though very uncommon — can occur with any medicine. Stop taking the tablets immediately and seek emergency medical help if you notice any of the following:

  • Swelling of the face, lips, tongue, or throat
  • Difficulty breathing or swallowing
  • A sudden widespread skin rash or hives
  • Dizziness or collapse

What Should You Do If You Experience Side Effects?

If you experience mild side effects such as wind or constipation, these often resolve on their own once you stop taking the tablets or reduce your dose. Staying well hydrated and eating a balanced diet with adequate fibre can help manage constipation. If side effects are persistent, unusual, or worrying, stop using the product and speak to your pharmacist or GP. You can also report suspected side effects directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk.

Can Rennie Peppermint Interact With Other Medicines?

Yes. Antacids can reduce the absorption of certain medicines if taken at the same time. This is because changes in stomach pH can affect how some drugs are absorbed into the bloodstream. To avoid interactions, leave a gap of at least 2 hours between taking Rennie Peppermint and any of the following:

  • Tetracycline antibiotics (e.g. doxycycline, tetracycline)
  • Iron supplements
  • Bisphosphonates (e.g. alendronic acid)
  • Antifungal medicines (e.g. ketoconazole, itraconazole)
  • Levothyroxine (thyroid medicine) — leave at least 4 hours
  • Some HIV medicines and quinolone antibiotics (e.g. ciprofloxacin)

Always tell your pharmacist or GP about all medicines, supplements, and herbal remedies you are taking before starting Rennie Peppermint.

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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