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Rennie Peppermint Indigestion and Heartburn Chewable Tablets - 3 x 24

Rennie Peppermint Indigestion and Heartburn Chewable Tablets - 3 x 24

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  • ✔️ Neutralises excess stomach acid to relieve heartburn fast
  • ✔️ Chewable peppermint tablets — no water required
  • ✔️ Suitable for adults and children aged 12 and over
  • ✔️ Triple pack of 72 tablets for long-lasting supply
  • ✔️ Relieves indigestion, acid reflux, and dyspepsia symptoms

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Are Rennie Peppermint Tablets Good for Heartburn?

 

If you've ever felt that uncomfortable burning sensation rising in your chest after a meal, you'll know how disruptive heartburn can be. Rennie peppermint tablets are one of the UK's most recognised over-the-counter antacid remedies, trusted by millions of people to bring fast relief from heartburn and indigestion. This triple pack — containing 3 x 24 chewable tablets — is ideal if you suffer from symptoms regularly and want a convenient, cost-effective supply at home. You can browse the full range of indigestion treatments in our indigestion collection.

Heartburn is extremely common in the UK. It occurs when stomach acid travels back up into the oesophagus, causing a burning feeling in the chest or throat. Indigestion — sometimes called dyspepsia — can also cause bloating, discomfort, and a feeling of fullness. Rennie's chewable format means relief can begin quickly, without needing water.

 

How Do Rennie Peppermint Tablets Work to Relieve Symptoms?

 

Rennie tablets work through a straightforward antacid mechanism. Each tablet contains two active ingredients — calcium carbonate (680 mg) and heavy magnesium carbonate (80 mg) — which together neutralise excess stomach acid. Here's how the process works:

  • You chew the tablet, releasing the active antacid ingredients.
  • Calcium carbonate and magnesium carbonate react with hydrochloric acid in the stomach.
  • This neutralisation reaction raises the pH of stomach contents, reducing acidity.
  • The burning sensation associated with acid reflux and indigestion subsides as a result.

Unlike proton pump inhibitors (PPIs) or H2 blockers, antacids like Rennie don't reduce the amount of acid your stomach produces — they simply neutralise what's already there. This makes them ideal for occasional, on-the-spot relief rather than long-term acid management.

 

Who Is Rennie Peppermint Suitable For?

 

Rennie peppermint chewable tablets are suitable for a wide range of people experiencing mild to moderate digestive discomfort. They're particularly useful for:

  • Adults and children aged 12 and over with occasional heartburn or indigestion.
  • People who experience symptoms after eating, drinking alcohol, or consuming spicy or fatty foods.
  • Pregnant women experiencing heartburn — though always check with your midwife or GP first.
  • Those who prefer a chewable, no-water-needed format for convenience on the go.

They are not suitable for children under 12, or for anyone with hypercalcaemia (high blood calcium), severe kidney impairment, or a known allergy to any of the ingredients. If you're unsure whether Rennie is right for you, speak to your pharmacist before use.

 

How Do Rennie Peppermint Tablets Compare to Other Antacids?

 

Feature Rennie Peppermint Tablets 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 on-the-go use Yes — no water needed Less convenient (liquid format)

 

How Should You Store Rennie Peppermint Tablets and Are They Clinically Suitable?

 

Store Rennie peppermint tablets below 25°C in a dry place, away from direct sunlight and out of reach of children. Do not use after the expiry date printed on the packaging. The tablets should be kept in their original blister packaging to protect them from moisture.

Clinically, Rennie is classified as a General Sale List (GSL) medicine in the UK, meaning it can be purchased without a prescription. However, if your symptoms persist for more than 7 days, worsen, or are accompanied by difficulty swallowing, unexplained weight loss, or vomiting blood, you should seek medical advice promptly. For related digestive concerns, you may also find our IBS and cramps collection helpful.

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 Indigestion and Heartburn Chewable Tablets 3 x 24 specifications
Treatment category Antacid / Indigestion and heartburn relief
Mechanism of action Neutralises excess stomach acid via calcium carbonate and magnesium carbonate
Effective for Heartburn, indigestion, acid reflux, dyspepsia
Suitable for Adults and children aged 12 and over
Active ingredient Calcium carbonate 680 mg, Heavy magnesium carbonate 80 mg per tablet
Pack size 3 x 24 tablets (72 tablets total)
UK classification General Sale List (GSL)
Drug class Antacid
Preparation Chewable tablet
Route of administration Oral

Specifications of Rennie Peppermint Indigestion and Heartburn Chewable Tablets 3 x 24

 

What Are Rennie Peppermint Tablets and What Are They Used For?

 

Rennie Peppermint Indigestion and Heartburn Chewable Tablets are an over-the-counter antacid medicine used to relieve the symptoms of heartburn, indigestion, and acid reflux. Each tablet contains calcium carbonate 680 mg and heavy magnesium carbonate 80 mg as active ingredients. These work together to neutralise excess stomach acid, providing symptomatic relief. The peppermint flavour makes them pleasant to chew, and because no water is required, they're easy to use wherever you are.

Heartburn occurs when stomach acid rises into the oesophagus, causing a burning sensation in the chest. Indigestion — or dyspepsia — refers to discomfort or pain in the upper abdomen, often after eating. Both conditions are very common and are usually triggered by diet, lifestyle factors, or stress. Rennie peppermint tablets are designed for short-term, symptomatic relief of these everyday digestive complaints.

 

What Do You Need to Know Before Using Rennie Peppermint Tablets?

 

Before taking Rennie, it's important to check whether this medicine is appropriate for you. Do not take Rennie peppermint tablets if any of the following apply:

  • You are under 12 years of age.
  • You have hypercalcaemia (high levels of calcium in the blood).
  • You have severe kidney disease or renal impairment.
  • You have hypercalciuria (high levels of calcium in the urine).
  • You are allergic to calcium carbonate, magnesium carbonate, or any other ingredient in the tablet.
  • You have been diagnosed with nephrolithiasis (kidney stones) related to calcium.

Speak to your pharmacist or GP before taking Rennie if you are pregnant, breastfeeding, or have any other medical condition. The following medicines may interact with Rennie — take them at least 2 hours apart:

  • Tetracycline antibiotics (e.g. doxycycline) — absorption may be reduced.
  • Iron supplements — antacids can reduce iron absorption.
  • Some antifungal medicines (e.g. itraconazole, ketoconazole).
  • Certain thyroid medicines (e.g. levothyroxine).
  • Bisphosphonates (e.g. alendronic acid) — used for bone health.

 

How Should You Use Rennie Peppermint Tablets Correctly?

 

Always use Rennie exactly as described in the patient information leaflet or as directed by your pharmacist. Follow these steps:

  1. Chew 2 tablets when symptoms of heartburn or indigestion occur.
  2. Do not swallow the tablets whole — chewing is essential for the antacid to work effectively.
  3. If symptoms persist after the first dose, you may take a further 2 tablets.
  4. Do not exceed the maximum daily dose.
  5. If symptoms continue for more than 7 days, stop use and consult your GP.
Age Group Dose Frequency Maximum Daily Dose
Adults and children 12+ 2 tablets When symptoms occur 16 tablets in 24 hours
Children under 12 Not recommended

 

What Are the Possible Side Effects of Rennie Peppermint Tablets?

 

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

Common side effects (may affect up to 1 in 10 people):

  • Constipation — more likely with calcium carbonate.
  • Diarrhoea — more likely with magnesium carbonate.
  • Flatulence (wind).

Less common side effects (may affect up to 1 in 100 people):

  • Nausea or stomach discomfort.
  • Hypercalcaemia (high blood calcium) — particularly with prolonged or excessive use.
  • Milk-alkali syndrome — a rare condition caused by taking too much calcium carbonate alongside dairy products; symptoms include nausea, vomiting, and confusion.

If you notice any serious or unexpected symptoms, stop taking Rennie and seek medical advice. You can also find related digestive health products in our sickness and nausea collection if you need additional support.

 

How Should You Store Rennie Peppermint Tablets Safely?

 

  • 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 blister pack or carton.
  • Do not dispose of medicines via wastewater or household waste — return unused tablets to your local pharmacy for safe disposal.

If you're managing multiple digestive health concerns alongside heartburn, it's worth exploring our constipation collection for additional OTC options that may complement your care.

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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 Rennie Peppermint Tablets online in the UK?

You can buy Rennie Peppermint Indigestion and Heartburn Chewable Tablets online from Cured Pharmacy, a GPhC-registered UK online pharmacy. The 3 x 24 pack is available at £13.49 and offers excellent value for those who experience heartburn or indigestion regularly. Simply add to your basket and choose your preferred delivery option at checkout.

How do Rennie Peppermint Tablets work in the body?

Rennie peppermint tablets contain two antacid ingredients — calcium carbonate and heavy magnesium carbonate — which neutralise excess hydrochloric acid in the stomach. This raises the stomach's pH and reduces the burning sensation caused by acid reflux or indigestion. The effect begins quickly after chewing, making Rennie a practical choice for on-the-spot relief.

How do I use Rennie Peppermint Tablets step by step?

Chew 2 tablets as soon as symptoms of heartburn or indigestion appear — do not swallow them whole. If symptoms persist, you may take a further 2 tablets, but do not exceed 16 tablets in any 24-hour period. No water is needed, making them convenient to use at any time of day.

What is the correct dose of Rennie Peppermint Tablets for adults?

The recommended dose for adults and children aged 12 and over is 2 chewable tablets when symptoms occur. The maximum daily dose is 16 tablets in 24 hours. Do not use for longer than 7 consecutive days without consulting your GP or pharmacist.

When is the best time to take Rennie Peppermint Tablets?

Rennie is best taken when symptoms arise — typically after meals, in the evening, or when you experience that familiar burning sensation in your chest or throat. Some people find symptoms are worse when lying down, so keeping a pack on your bedside table can be useful. There is no fixed time of day; take them as and when needed within the daily dose limit.

What are the side effects of Rennie Peppermint Tablets?

Most people tolerate Rennie well, but possible side effects include constipation, diarrhoea, and flatulence. Less commonly, prolonged or excessive use may lead to elevated blood calcium levels (hypercalcaemia). If you notice any unusual or persistent symptoms, stop taking the tablets and speak to your pharmacist or GP.

How do I manage side effects of Rennie Peppermint Tablets?

If you experience constipation, increasing your fluid and fibre intake may help. Diarrhoea is usually mild and self-limiting — if it persists, seek advice from your pharmacist. Staying within the recommended daily dose is the most effective way to minimise the risk of side effects from Rennie.

Who should not take Rennie Peppermint Tablets?

Rennie is not suitable for children under 12, or for people with hypercalcaemia, severe kidney disease, calcium-related kidney stones, or a known allergy to any of the ingredients. If you have any of these conditions, speak to your GP before using any antacid. Always read the full patient information leaflet before starting treatment.

Can I take Rennie Peppermint Tablets during pregnancy?

Heartburn is very common during pregnancy, and Rennie is generally considered suitable for use when taken as directed. However, you should always speak to your midwife, GP, or pharmacist before taking any medicine during pregnancy, including over-the-counter antacids. They can advise on the safest option for your individual circumstances.

Can Rennie Peppermint Tablets interact with other medicines?

Yes — Rennie can reduce the absorption of certain medicines, including tetracycline antibiotics, iron supplements, some antifungals (such as itraconazole), levothyroxine, and bisphosphonates. To avoid this, take Rennie at least 2 hours before or after these medicines. Always tell your pharmacist about all medicines you are taking before starting Rennie.

How long can you use Rennie Peppermint Tablets for?

Rennie is intended for short-term, symptomatic relief and should not be used for more than 7 consecutive days without medical advice. If your symptoms persist beyond this period, worsen, or are accompanied by other symptoms such as difficulty swallowing or unexplained weight loss, you should see your GP. Persistent heartburn may require investigation and a different treatment approach.

What are alternatives to Rennie Peppermint Tablets for heartburn?

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

What happens if I take too many Rennie Peppermint Tablets?

Taking more than the recommended dose of Rennie can lead to hypercalcaemia (high blood calcium), which may cause symptoms such as nausea, vomiting, weakness, and confusion. In rare cases, excessive long-term use can cause milk-alkali syndrome. If you think you have taken too many tablets, contact NHS 111 or your nearest A&E immediately.

Are Rennie Peppermint Tablets suitable for vegetarians or vegans?

Rennie Peppermint Tablets do not contain any ingredients of animal origin and are considered suitable for vegetarians. However, if you follow a vegan lifestyle, it is always worth checking the full ingredient list on the packaging or contacting the manufacturer directly to confirm suitability. You can also browse our vegan collection for products confirmed as vegan-friendly.

What is the latest research on antacids like Rennie for heartburn?

Antacids containing calcium carbonate and magnesium carbonate have a well-established evidence base for short-term relief of heartburn and indigestion, and remain a first-line recommendation for mild, occasional symptoms according to NHS guidance. Research continues to support lifestyle modifications — such as avoiding trigger foods, eating smaller meals, and not lying down after eating — as important alongside antacid use. For persistent or frequent symptoms, clinical guidelines recommend further investigation to rule out underlying conditions such as gastro-oesophageal reflux disease (GORD).

How Should You Use Rennie Peppermint Tablets?

Rennie Peppermint Chewable Tablets are simple to use and require no water, making them convenient whether you're at home or out and about. Always read the patient information leaflet before use and follow the steps below for best results.

Follow these steps each time you take Rennie:

What Is the Correct Dose of Rennie Peppermint Tablets?

The dose of Rennie varies by age. Children under 12 should not use this product. Always stay within the recommended limits to avoid side effects such as hypercalcaemia.

When Is the Best Time to Use Rennie Peppermint Tablets?

Rennie is designed to be taken on demand — that is, when symptoms arise rather than at a fixed time each day. Many people find heartburn and indigestion are most troublesome after meals, particularly after eating spicy, fatty, or rich foods, or after drinking alcohol or coffee.

Taking Rennie shortly after eating, or when you first notice that burning sensation, tends to give the quickest relief. If you regularly experience symptoms at night, keeping a pack nearby can help you manage discomfort without delay. Remember to take Rennie at least 2 hours apart from any other medicines that may interact with it.

How Long Can You Use Rennie Peppermint Tablets For?

Rennie is intended for short-term use only. You should not take it for more than 7 consecutive days without speaking to your GP or pharmacist. If your symptoms are frequent, severe, or returning regularly, this may indicate an underlying condition such as gastro-oesophageal reflux disease (GORD) that requires proper investigation and treatment.

Lifestyle changes — such as eating smaller meals, avoiding trigger foods, maintaining a healthy weight, and not lying down immediately after eating — can help reduce how often you need to rely on antacids. Your GP can advise on longer-term management if symptoms persist.

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 Tablets?

Rennie Peppermint Tablets are generally well tolerated when taken as directed. However, as with all medicines, some people may experience side effects. The most common ones are related to the antacid ingredients themselves and are usually mild.

  • Constipation — more commonly associated with calcium carbonate.
  • Diarrhoea — more commonly associated with magnesium carbonate.
  • Flatulence (wind) or bloating.

What Are the Less Common Side Effects of Rennie Peppermint Tablets?

Less commonly, some people may experience the following, particularly if Rennie is taken in higher doses or for longer than recommended:

  • Nausea or stomach discomfort.
  • Hypercalcaemia (raised blood calcium levels) — symptoms include nausea, vomiting, weakness, increased thirst, and confusion.
  • Milk-alkali syndrome — a rare condition caused by excessive calcium carbonate intake alongside dairy products; symptoms include nausea, vomiting, headache, and altered mental state.
  • Rebound acid hypersecretion — where the stomach produces more acid after the antacid wears off, though this is more associated with prolonged use.

What Are the Serious Side Effects of Rennie Peppermint Tablets?

Serious side effects from Rennie are rare when the product is used correctly and within the recommended dose. However, you should seek urgent medical attention if you experience any of the following after taking Rennie:

  • Signs of a severe allergic reaction — including swelling of the face, lips, tongue, or throat, difficulty breathing, or a widespread skin rash.
  • Symptoms of hypercalcaemia — such as confusion, extreme weakness, irregular heartbeat, or excessive thirst.
  • Vomiting blood or passing black, tarry stools — these are not side effects of Rennie but are serious symptoms that require immediate medical assessment.

What Should You Do If You Experience Side Effects of Rennie Peppermint Tablets?

If you experience mild side effects such as constipation or wind, these often resolve on their own without stopping treatment. Drinking plenty of water and eating a balanced diet with adequate fibre can help manage constipation. If side effects are persistent, bothersome, or you are concerned, stop taking Rennie 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. This helps improve medicine safety information for everyone.

Can Rennie Peppermint Tablets Interact With Other Medicines?

Yes — Rennie can affect how certain other medicines are absorbed by the body. This is because antacids alter the pH of the stomach, which can reduce the absorption of some drugs. To minimise the risk of interactions, take Rennie at least 2 hours before or after the following medicines:

  • Tetracycline antibiotics (e.g. doxycycline, tetracycline).
  • Iron supplements (e.g. ferrous sulphate).
  • Antifungal medicines (e.g. itraconazole, ketoconazole).
  • Thyroid medicines (e.g. levothyroxine).
  • Bisphosphonates (e.g. alendronic acid).
  • Some HIV medicines and quinolone antibiotics (e.g. ciprofloxacin).

Always inform your pharmacist of all medicines, supplements, and herbal remedies you are taking before starting Rennie.

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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