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Rennie Spearmint Digestif - 24 tablets

Rennie Spearmint Digestif - 24 tablets

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  • ✔️ Neutralises excess stomach acid fast for heartburn relief
  • ✔️ Chewable spearmint tablets — no water needed
  • ✔️ Suitable for adults and children aged 12 and over
  • ✔️ Contains calcium carbonate and magnesium carbonate antacids
  • ✔️ Convenient 24-tablet pack for on-the-go symptom relief

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Are Rennie Spearmint Tablets Right for You?

 

That uncomfortable burning feeling after a meal — or the sour taste that creeps up your throat at the worst possible moment — is something most of us have experienced at some point. Rennie Spearmint tablets are a well-established, over-the-counter antacid designed to tackle exactly that. Each pack contains 24 chewable tablets with a refreshing spearmint flavour, making them easy to take on the go, at work, or after a heavy meal. Available at Cured Pharmacy for just £3.49, they offer a straightforward, affordable option for managing occasional heartburn and indigestion. If you're also browsing for other digestive support products, our indigestion collection has a range of options worth exploring.

Heartburn affects a significant proportion of the UK population regularly. It occurs when stomach acid travels back up into the oesophagus, causing that familiar burning discomfort. Indigestion — sometimes called dyspepsia — can bring bloating, nausea, and a feeling of fullness. Rennie has been used by millions of people across the UK for decades, and the spearmint variant is one of the most popular flavours in the range.

 

How Do Rennie Spearmint Tablets Work?

 

The mechanism is straightforward. Each tablet contains two active antacid ingredients that work together to neutralise excess stomach acid quickly and effectively. Here's how it happens:

  • Calcium carbonate (680 mg per tablet) reacts with hydrochloric acid in the stomach, converting it into calcium chloride, water, and carbon dioxide — reducing acidity rapidly.
  • Heavy magnesium carbonate (80 mg per tablet) works alongside calcium carbonate to provide a complementary antacid effect, helping to sustain relief.
  • Together, these ingredients raise the pH of the stomach contents, easing the burning sensation in the oesophagus and upper digestive tract.
  • The tablets are chewed or sucked rather than swallowed whole, which means the active ingredients begin working almost immediately on contact with stomach acid.

There's no need for water, and the spearmint flavour makes them pleasant to take — a small but genuinely useful detail when you're dealing with discomfort after eating.

 

Who Should Use Rennie Spearmint Tablets?

 

These tablets are suitable for a wide range of adults and older children experiencing occasional digestive discomfort. They're particularly useful if you suffer from symptoms triggered by food, drink, or lifestyle factors. That said, they're not a long-term solution for chronic acid reflux or gastro-oesophageal reflux disease (GORD) — those conditions need proper medical assessment.

Rennie Spearmint tablets are generally appropriate for:

  • Adults and children aged 12 and over with occasional heartburn or acid indigestion
  • People experiencing discomfort after eating rich, spicy, or fatty foods
  • Those who need fast-acting, portable relief without a prescription
  • Pregnant women seeking short-term heartburn relief (always check with your midwife or GP first)

 

How Do Rennie Spearmint Tablets Compare to Other Antacids?

 

Feature Rennie Spearmint Tablets Gaviscon Advance Liquid
Active ingredients Calcium carbonate, magnesium carbonate Sodium alginate, potassium bicarbonate
Form Chewable tablet Liquid suspension
Mechanism Neutralises stomach acid Forms a raft barrier over stomach contents
Portability Highly portable — no liquid required Less convenient to carry

 

How Should You Store Rennie Spearmint Tablets?

 

Store your Rennie Spearmint tablets below 25°C in a dry place, away from direct sunlight and moisture. Keep them out of reach and sight of children at all times. Do not use the tablets after the expiry date printed on the pack — check this before purchase and before each use. If you're managing multiple health products at home, it's worth keeping medicines organised and clearly labelled to avoid confusion.

If you're looking to support your overall wellbeing alongside digestive health, our vitamins and supplements collection includes a range of products that may complement a healthy lifestyle.

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

Specifications of Rennie Spearmint Digestif 24 Tablets

 

What Is Rennie Spearmint Digestif and What Is It Used For?

 

Rennie Spearmint Digestif is an over-the-counter antacid medicine used to relieve the symptoms of heartburn, acid indigestion, and an upset or sour stomach. It contains two active antacid ingredients — calcium carbonate and heavy magnesium carbonate — which work by neutralising excess acid produced in the stomach. The tablets are chewable and spearmint-flavoured, making them easy and pleasant to take without water.

This medicine is classified as a General Sale List (GSL) product in the UK, meaning it can be purchased without a prescription. It is intended for short-term, symptomatic relief only. If your symptoms are frequent, severe, or have lasted more than two weeks, you should speak to your GP rather than continuing to self-treat.

 

What Do You Need to Know Before Using Rennie Spearmint Digestif?

 

Before taking these tablets, it's important to check whether they are appropriate for you. Do not take Rennie Spearmint Digestif 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 calcium levels in the blood)
  • You have severe kidney disease or kidney failure
  • You have a condition called milk-alkali syndrome
  • You are under 12 years of age

You should also be aware of the following potential drug interactions. Antacids can affect the absorption of other medicines. Take Rennie Spearmint tablets at least 2 hours apart from:

  • Tetracycline antibiotics (e.g. doxycycline, oxytetracycline)
  • Iron supplements
  • Bisphosphonates (e.g. alendronic acid)
  • Some antifungal medicines (e.g. ketoconazole, itraconazole)
  • Thyroid medicines (e.g. levothyroxine)
  • Some HIV medicines

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

 

How Should You Use Rennie Spearmint Digestif?

 

Always use this medicine exactly as described on the pack or as directed by your pharmacist. Do not exceed the recommended dose.

  1. Chew or suck 2 tablets thoroughly — do not swallow them whole.
  2. Take after meals and at bedtime, or whenever symptoms occur.
  3. Allow the tablet to dissolve fully in your mouth before swallowing.
  4. No water is needed, making these tablets convenient to take anywhere.
  5. Do not take more than 2 tablets per dose.
  6. Do not exceed 16 tablets in any 24-hour period.
Indication Age Group Dose Frequency
Heartburn / Indigestion Adults & children 12+ 2 tablets After meals & at bedtime, as needed (max 16 tablets/24 hrs)
Not recommended Under 12 years

If you're also managing other digestive issues such as bloating or cramping, you may find our IBS and cramps collection helpful for exploring additional options.

 

What Are the Possible Side Effects of Rennie Spearmint Digestif?

 

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

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

  • Constipation (more likely with calcium-containing antacids)
  • Diarrhoea (more likely with magnesium-containing antacids)
  • Flatulence (wind)

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

  • Nausea or stomach discomfort
  • Hypercalcaemia (raised blood calcium) with prolonged high-dose use — symptoms include weakness, confusion, or increased thirst
  • Rebound acid hypersecretion if used excessively over a long period

Stop taking the tablets and seek medical advice if you notice any signs of an allergic reaction, such as a rash, swelling of the face or throat, or difficulty breathing. These reactions are rare but require prompt attention.

 

How Should You Store Rennie Spearmint Digestif?

 

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

  • Store below 25°C in a dry place
  • Keep away from direct sunlight and moisture
  • Store out of the sight and reach of children
  • Do not use after the expiry date printed on the pack
  • Do not store in a bathroom cabinet where humidity may be high
  • Dispose of unused or expired medicines responsibly — return them to your local pharmacy

If you experience nausea alongside your indigestion symptoms, you might also want to browse our sickness and nausea collection for additional support products.

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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 Spearmint tablets online in the UK?

You can buy Rennie Spearmint Digestif 24 tablets directly from Cured Pharmacy, a GPhC-registered UK online pharmacy, for just £3.49. No prescription is required as this is an over-the-counter antacid medicine. Simply add to your basket and choose your preferred delivery option at checkout.

How do Rennie Spearmint tablets work in the body?

Rennie Spearmint tablets contain calcium carbonate and heavy magnesium carbonate, which neutralise excess hydrochloric acid in the stomach on contact. This raises the stomach's pH, reducing the burning sensation caused by acid reflux or indigestion. Because the tablets are chewed rather than swallowed whole, the active ingredients begin working almost immediately.

How do I take Rennie Spearmint tablets correctly?

Chew or suck 2 tablets thoroughly after meals and at bedtime, or whenever heartburn or indigestion symptoms occur. Do not swallow the tablets whole — chewing them allows the antacid ingredients to work quickly. No water is needed, making them easy to take anywhere.

What is the maximum number of Rennie Spearmint tablets I can take in a day?

Adults and children aged 12 and over should not take more than 16 tablets in any 24-hour period. Taking more than the recommended dose increases the risk of side effects such as hypercalcaemia. Always read the pack instructions carefully and speak to your pharmacist if you are unsure.

Are Rennie Spearmint tablets safe to take during pregnancy?

Rennie antacid tablets are widely used during pregnancy for short-term relief of heartburn, which is very common in the second and third trimesters. However, you should always consult your midwife, GP, or pharmacist before taking any medicine during pregnancy to ensure it is appropriate for your individual circumstances. The NHS advises speaking to a healthcare professional about heartburn remedies in pregnancy.

Can children take Rennie Spearmint tablets?

Rennie Spearmint Digestif tablets are suitable for adults and children aged 12 years and over. They are not recommended for children under 12 without specific medical advice. If your child is experiencing digestive symptoms, speak to your GP or pharmacist for age-appropriate treatment options.

What are the side effects of Rennie Spearmint tablets?

Side effects are uncommon when Rennie Spearmint tablets are taken as directed, but may include constipation, diarrhoea, or flatulence. In rare cases, prolonged high-dose use can lead to raised blood calcium levels (hypercalcaemia). If you notice any unusual symptoms, stop taking the tablets and speak to your pharmacist or GP.

How long can I keep taking Rennie Spearmint tablets?

Rennie Spearmint tablets are designed for short-term, symptomatic relief of occasional heartburn and indigestion. If your symptoms persist for more than 14 days, or if they are severe or worsening, you should consult your GP as this may indicate an underlying condition such as gastro-oesophageal reflux disease (GORD) that requires further investigation and treatment.

Do Rennie Spearmint tablets interact with other medicines?

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

What are the alternatives to Rennie Spearmint tablets for heartburn?

Alternatives include other antacids such as Gaviscon (which forms a protective raft over stomach contents) or H2 receptor antagonists such as famotidine, which reduce acid production rather than neutralising it. For frequent or persistent symptoms, a GP may recommend a proton pump inhibitor (PPI) such as omeprazole. You can explore more options in our indigestion collection.

Can I take Rennie Spearmint tablets on an empty stomach?

Rennie Spearmint tablets can be taken whenever symptoms occur, including on an empty stomach. However, they are most commonly taken after meals and at bedtime, when acid reflux and indigestion symptoms tend to be most troublesome. Taking them with or after food may also help to prolong their effect.

What happens if I accidentally take too many Rennie Spearmint tablets?

Taking more than the recommended dose of Rennie Spearmint tablets can lead to side effects including nausea, vomiting, and in more serious cases, raised blood calcium levels (hypercalcaemia). If you or someone else has taken too many tablets, contact NHS 111 or your nearest A&E department for advice. Always keep medicines out of reach of children.

Are Rennie Spearmint tablets suitable for people with kidney problems?

Rennie Spearmint tablets are 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 antacid medicines. They can advise on the safest option for your situation.

What lifestyle changes can help alongside taking Rennie Spearmint tablets?

The NHS recommends several lifestyle measures to reduce heartburn and indigestion, including eating smaller meals, avoiding trigger foods (such as fatty, spicy, or acidic foods), not lying down immediately after eating, and maintaining a healthy weight. Reducing alcohol and stopping smoking can also make a significant difference. Rennie tablets work best as part of a broader approach to managing symptoms, and you might also find our pain relief collection useful for managing associated discomfort.

What is the latest research on antacid tablets like Rennie?

Calcium carbonate and magnesium carbonate antacids have a long and well-established safety record, and current clinical guidance continues to support their use for short-term relief of mild to moderate heartburn and indigestion. Research increasingly highlights the importance of addressing underlying causes — such as diet, weight, and lifestyle — rather than relying solely on antacids for long-term management. Your GP can advise on the most appropriate treatment if symptoms are ongoing.

How Should You Use Rennie Spearmint Digestif Tablets?

Using Rennie Spearmint Digestif tablets correctly ensures you get the most effective relief from heartburn and indigestion. These tablets are designed to be chewed or sucked — not swallowed whole — so the active antacid ingredients can begin working as soon as they come into contact with stomach acid. Follow these steps each time you take a dose:

If your symptoms do not improve after taking the tablets, do not take additional doses beyond the recommended amount. Speak to your pharmacist for further guidance.

What Is the Correct Dose of Rennie Spearmint Digestif Tablets?

The correct dose depends on your age. Always follow the dosage instructions on the pack and never exceed the stated maximum. Taking more than the recommended amount does not improve symptom relief and increases the risk of side effects.

If you are unsure about the correct dose for your situation — for example, if you are pregnant, have kidney problems, or are taking other medicines — always check with your pharmacist before use.

When Is the Best Time to Use Rennie Spearmint Digestif Tablets?

Rennie Spearmint Digestif tablets can be taken whenever heartburn or indigestion symptoms occur. Most people find symptoms are worst after meals and at bedtime, particularly after eating rich, fatty, or spicy foods, or after drinking alcohol or coffee. Taking the tablets shortly after eating — rather than waiting for symptoms to become severe — can help provide faster, more comfortable relief. They are also useful to keep to hand when travelling or eating out, as symptoms can be unpredictable.

If you are taking other medicines, remember to leave at least 2 hours between Rennie tablets and those other medicines to avoid any interaction affecting absorption.

How Long Can You Use Rennie Spearmint Digestif Tablets For?

Rennie Spearmint Digestif tablets are intended for short-term, occasional use only. They are not a substitute for treating an underlying digestive condition. If you find yourself needing to take antacid tablets every day, or if your symptoms have persisted for more than 14 days, this is a signal to speak to your GP. Persistent heartburn or indigestion can sometimes indicate gastro-oesophageal reflux disease (GORD), a peptic ulcer, or another condition that requires proper diagnosis and 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 Spearmint Digestif Tablets?

Most people who take Rennie Spearmint Digestif tablets as directed do not experience significant side effects. However, as with all medicines, some people may notice unwanted effects. The most commonly reported side effects relate to changes in bowel habit, which can occur because of the antacid ingredients themselves.

  • Constipation — more likely with calcium carbonate-containing antacids
  • Diarrhoea — more likely with magnesium-containing antacids
  • Flatulence (wind or bloating)

These effects are usually mild and tend to resolve on their own. Drinking plenty of water and maintaining a balanced diet can help manage them.

What Are the Less Common Side Effects of Rennie Spearmint Digestif Tablets?

Less common side effects are more likely to occur if the tablets are taken in higher doses than recommended, or over a prolonged period. If you notice any of the following, stop taking the tablets and speak to your pharmacist or GP:

  • Nausea or stomach discomfort
  • Hypercalcaemia (raised blood calcium levels) — symptoms may include unusual tiredness, weakness, confusion, increased thirst, or frequent urination
  • Rebound acid hypersecretion — where the stomach produces more acid after stopping antacid use, particularly with excessive long-term use
  • Milk-alkali syndrome (very rare) — associated with very high calcium intake alongside antacids

What Are the Serious Side Effects of Rennie Spearmint Digestif Tablets?

Serious side effects from Rennie Spearmint tablets are rare when the product is used as directed. However, allergic reactions, though uncommon, can occur. Seek immediate medical attention if you experience any of the following after taking these tablets:

  • Skin rash, itching, or hives
  • Swelling of the face, lips, tongue, or throat
  • Difficulty breathing or swallowing
  • Sudden dizziness or feeling faint

These symptoms may indicate a serious allergic reaction (anaphylaxis) and require emergency treatment. Call 999 or go to your nearest A&E immediately.

What Should You Do If You Experience Side Effects?

If you experience mild side effects such as constipation or wind, these often resolve without any specific treatment. Staying well hydrated and avoiding foods that worsen your symptoms can help. If side effects are persistent, bothersome, or you are concerned about any symptom — however minor it seems — contact your pharmacist or GP for advice. You can also report suspected side effects directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk.

Can Rennie Spearmint Digestif Tablets Interact With Other Medicines?

Yes. Antacids can interfere with the absorption of several other medicines by altering the pH of the stomach and gut. This can reduce the effectiveness of those medicines if taken too close together. To minimise the risk of interactions, take Rennie Spearmint tablets at least 2 hours before or after the following:

  • Tetracycline antibiotics (e.g. doxycycline, oxytetracycline)
  • Iron supplements
  • Bisphosphonates (e.g. alendronic acid)
  • Antifungal medicines (e.g. ketoconazole, itraconazole)
  • Levothyroxine (thyroid medicine)
  • Some antiretroviral medicines used in HIV treatment

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