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Rennie Heartburn, Indigestion & Wind Relief Chewable Tablets 24's

Rennie Heartburn, Indigestion & Wind Relief Chewable Tablets 24's

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  • ✔️ Neutralises excess stomach acid to relieve heartburn fast
  • ✔️ Relieves trapped wind and bloating with simeticone
  • ✔️ Chewable format works quickly without water needed
  • ✔️ Suitable for adults and children aged 12 and over
  • ✔️ Treats heartburn, indigestion, and wind in one tablet

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What Are Rennie Heartburn Tablets and How Do They Help?

 

That burning sensation creeping up your chest after a meal — most of us know it all too well. Rennie heartburn tablets are one of the UK's most recognised over-the-counter antacid remedies, designed to tackle heartburn, indigestion, and trapped wind in one convenient chewable tablet. Each pack contains 24 tablets, making it easy to keep a supply at home or in your bag for when symptoms strike. At just £4.99, it's an accessible option for everyday digestive discomfort. If you're looking for a broader range of digestive remedies, you can also browse our indigestion collection for more options.

Heartburn affects a significant proportion of adults in the UK, often triggered by certain foods, eating too quickly, or lying down after meals. Rennie has been used for decades as a trusted first-line remedy, and its combination of active ingredients addresses not just acid but also the uncomfortable bloating and wind that often accompany indigestion.

 

How Do Rennie Chewable Tablets Work to Relieve Symptoms?

 

Rennie works through a straightforward acid-neutralising mechanism. The three active ingredients each play a distinct role:

  • Calcium carbonate (680mg): Acts as an antacid by directly neutralising excess hydrochloric acid in the stomach, raising gastric pH and reducing the burning sensation associated with heartburn.
  • Magnesium carbonate (80mg): Works alongside calcium carbonate to provide additional acid-neutralising capacity, helping to sustain relief.
  • Simeticone (25mg): An antifoaming agent that breaks down gas bubbles trapped in the stomach and intestines, easing bloating and wind.

Because the tablets are chewed rather than swallowed whole, the active ingredients begin working in the mouth and reach the stomach quickly. Relief can typically be felt within minutes of taking the tablets.

 

Who Is Suitable for Using Rennie Heartburn, Indigestion & Wind Relief Tablets?

 

These tablets are suitable for most adults and children aged 12 and over who experience occasional heartburn, indigestion, or trapped wind. They're particularly useful for:

  • Adults experiencing heartburn after eating spicy, fatty, or acidic foods
  • People who suffer from post-meal bloating and trapped wind
  • Pregnant women seeking short-term relief from pregnancy-related heartburn (after consulting a healthcare professional)
  • Those who prefer a chewable, non-swallowable tablet format

They are not suitable for children under 12, and people with kidney disease, hypercalcaemia, or known hypersensitivity to any of the ingredients should avoid them. Always read the label before use.

 

How Do Rennie Tablets Compare to Other Antacid Options?

 

Feature Rennie Heartburn, Indigestion & Wind Relief Standard Rennie (Original)
Active ingredients Calcium carbonate, magnesium carbonate, simeticone Calcium carbonate, magnesium carbonate
Treats wind/bloating Yes — simeticone included No
Suitable for 12+ Yes Yes
Tablet format Chewable Chewable

 

How Should You Store Rennie Tablets and Are They Safe Long-Term?

 

Store Rennie 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. These tablets are intended for short-term, occasional use — if you find yourself reaching for Rennie heartburn tablets regularly over more than a week, it's worth speaking to your GP, as persistent symptoms may point to an underlying condition such as gastro-oesophageal reflux disease (GORD). If you're also managing other digestive concerns, our IBS and cramps collection may be 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.

Rennie Heartburn, Indigestion & Wind Relief Chewable Tablets 24's specifications
Treatment category Antacid / Digestive relief
Mechanism of action Acid neutralisation and antifoaming
Effective for Heartburn, indigestion, trapped wind
Suitable for Adults and children aged 12 and over
Active ingredients Calcium carbonate 680mg, Magnesium carbonate 80mg, Simeticone 25mg
Pack size 24 tablets
UK classification General Sale List (GSL)
Drug class Antacid with antifoaming agent
Preparation Chewable tablet
Route of administration Oral

Specifications of Rennie Heartburn, Indigestion & Wind Relief Chewable Tablets 24's

 

What Is Rennie Heartburn, Indigestion & Wind Relief and What Is It Used For?

 

Rennie Heartburn, Indigestion & Wind Relief Chewable Tablets are an over-the-counter antacid medicine used to relieve the symptoms of heartburn, acid indigestion, and trapped wind. Heartburn — that uncomfortable burning feeling in the chest or throat — occurs when stomach acid travels back up into the oesophagus. Indigestion (also called dyspepsia) can cause pain or discomfort in the upper abdomen, often after eating. Trapped wind causes bloating and abdominal discomfort. These tablets address all three symptoms in a single dose.

The NHS notes that most people experience heartburn or indigestion at some point, and that lifestyle factors such as eating large meals, consuming fatty or spicy foods, drinking alcohol, and smoking can all contribute. Rennie tablets offer a convenient, fast-acting option for occasional symptom relief.

 

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

 

Before taking these tablets, check the following contraindications and warnings carefully:

  • Do not take if you are allergic to calcium carbonate, magnesium carbonate, simeticone, or any other ingredient in the tablets
  • Do not use if you have hypercalcaemia (high calcium levels in the blood)
  • Do not use if you have severe kidney disease or kidney stones
  • Not suitable for children under 12 years of age
  • Consult your GP or pharmacist before use if you are pregnant or breastfeeding
  • Do not take for more than 7 days without medical advice
  • Seek medical advice if you experience unexplained weight loss, difficulty swallowing, or vomiting blood alongside your symptoms

Drug interactions to be aware of:

  • Tetracycline antibiotics (e.g. doxycycline) — antacids can reduce absorption; leave at least 2 hours between doses
  • Iron supplements — absorption may be reduced; separate doses by at least 2 hours
  • Thyroid medications (e.g. levothyroxine) — take at least 4 hours apart
  • Some heart medications, including digoxin — consult your pharmacist
  • Bisphosphonates (e.g. alendronic acid) — do not take together

 

How Should You Use Rennie Heartburn, Indigestion & Wind Relief Tablets?

 

  1. Chew or suck 2 tablets when symptoms occur — do not swallow them whole
  2. Allow the tablets to dissolve fully in the mouth before swallowing
  3. Repeat after 2–4 hours if symptoms return, up to a maximum of 3 times per day
  4. Do not exceed 6 tablets in any 24-hour period
  5. If symptoms persist beyond 7 days, stop use and consult your GP
Age Group Dose Frequency Maximum Daily Dose
Adults and children 12+ 2 tablets Up to 3 times daily when needed 6 tablets per 24 hours
Children under 12 Not recommended

 

What Are the Possible Side Effects of Rennie Chewable Tablets?

 

Side effects with Rennie tablets are uncommon when used as directed. However, as with all medicines, some people may experience unwanted effects. If you're also taking other medicines for digestive issues, it's worth checking our sickness and nausea collection for complementary options.

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

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

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

  • Nausea
  • Stomach cramps
  • Rebound acid hypersecretion with prolonged use
  • Hypercalcaemia (raised blood calcium) with excessive long-term use — symptoms include nausea, weakness, and confusion

Stop taking the tablets and seek medical advice if you experience any serious or unexpected symptoms.

 

How Should You Store Rennie Heartburn, Indigestion & Wind Relief Tablets?

 

Proper storage helps maintain the effectiveness of the 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
  • Do not dispose of medicines via wastewater or household waste — return unused tablets to your pharmacy

If you're managing your overall digestive health alongside other conditions, you may also find our vitamins and supplements collection useful for supporting gut wellbeing.

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Frequently Asked Questions

Where can I buy Rennie heartburn tablets online in the UK?

You can buy Rennie Heartburn, Indigestion & Wind Relief Chewable Tablets 24's directly from Cured Pharmacy online for just £4.99, with fast UK delivery. They are a General Sale List (GSL) medicine, so no prescription is needed. You can also browse our full indigestion collection for related products.

How do Rennie chewable tablets work in the body?

Rennie tablets contain calcium carbonate and magnesium carbonate, which neutralise excess stomach acid on contact, raising the pH in the stomach and relieving the burning sensation of heartburn. Simeticone, the third active ingredient, acts as an antifoaming agent that breaks up trapped gas bubbles to relieve bloating and wind. Because the tablets are chewed, the ingredients start working quickly — often within minutes.

How do I use Rennie Heartburn, Indigestion & Wind Relief tablets step by step?

Chew or suck 2 tablets when your symptoms occur — do not swallow them whole, as chewing helps the active ingredients work faster. You can repeat the dose after 2–4 hours if needed, but do not take more than 6 tablets in any 24-hour period. If symptoms persist beyond 7 days, stop use and speak to your GP.

What is the correct dose of Rennie tablets for adults?

The recommended adult dose is 2 tablets chewed or sucked when symptoms occur, up to a maximum of 3 times per day. This means the maximum daily dose is 6 tablets in 24 hours. Do not exceed this amount unless specifically advised to do so by a doctor or pharmacist.

Can I take Rennie tablets during pregnancy?

Rennie tablets are widely used during pregnancy for short-term relief of heartburn and indigestion, which are very common in the second and third trimesters. However, you should always check with your midwife, GP, or pharmacist before taking any medicine during pregnancy, as individual circumstances vary. High-dose or prolonged use of calcium-containing antacids during pregnancy is not recommended without medical supervision.

Are Rennie chewable tablets suitable for children?

Rennie Heartburn, Indigestion & Wind Relief Chewable Tablets are suitable for adults and children aged 12 and over only. They should not be given to children under 12 years of age. If a younger child is experiencing digestive symptoms, speak to your GP or pharmacist for appropriate advice.

What are the side effects of Rennie heartburn tablets?

Side effects are uncommon when Rennie tablets are used as directed, but some people may experience constipation (linked to calcium carbonate) or diarrhoea (linked to magnesium carbonate). Less commonly, nausea or stomach cramps may occur. If you experience any unusual or persistent symptoms, stop taking the tablets and consult your pharmacist or GP.

Can Rennie tablets interact with other medicines I'm taking?

Yes — antacids like Rennie can affect the absorption of several medicines, including tetracycline antibiotics, iron supplements, levothyroxine, bisphosphonates, and digoxin. As a general rule, leave at least 2 hours (and up to 4 hours for some medicines) between taking Rennie and any other medication. Always check with your pharmacist if you are unsure.

How long can I keep taking Rennie tablets for?

Rennie tablets are designed for short-term, occasional use only — they should not be taken continuously for more than 7 days without medical advice. If your heartburn or indigestion keeps coming back, this could be a sign of an underlying condition such as gastro-oesophageal reflux disease (GORD), which requires proper assessment by a GP. Long-term self-treatment with antacids can mask more serious conditions.

What happens if I accidentally take too many Rennie tablets?

Taking more than the recommended dose of Rennie tablets can lead to side effects such as nausea, vomiting, constipation, or in rare cases, raised blood calcium levels (hypercalcaemia). If you or someone else has taken a large overdose, contact NHS 111 or go to your nearest A&E immediately. Always keep medicines out of reach of children.

What is the best time to take Rennie tablets?

Rennie tablets are best taken when symptoms occur — typically after meals or at bedtime when heartburn and indigestion are most common. There is no fixed schedule; they are an as-needed remedy rather than a preventative one. If you find you need them every day, speak to your GP about longer-term management options.

Are there alternatives to Rennie tablets for heartburn relief?

Yes, there are several alternatives available over the counter in the UK, including other antacids (such as Gaviscon), H2 blockers (such as famotidine), and proton pump inhibitors (such as omeprazole) for more persistent symptoms. The right choice depends on the frequency and severity of your symptoms. You can explore a range of options in our indigestion collection.

Can I take Rennie tablets on an empty stomach?

Yes, you can take Rennie tablets on an empty stomach if you are experiencing symptoms at that time. However, heartburn and indigestion most commonly occur after eating, so most people take them following a meal. If you regularly experience symptoms on an empty stomach, this is worth discussing with your GP.

What are the latest findings on antacid use for heartburn?

Current NHS guidance confirms that antacids containing calcium carbonate and magnesium carbonate remain a safe and effective first-line option for occasional heartburn and indigestion in adults. For frequent or severe symptoms, clinical guidelines recommend stepping up to H2 blockers or proton pump inhibitors under medical supervision. Lifestyle changes — including weight management, avoiding trigger foods, and not lying down after eating — remain central to long-term management.

Do Rennie tablets contain any allergens or animal-derived ingredients?

Rennie tablets contain sucrose and may not be suitable for people with rare hereditary conditions such as fructose intolerance or glucose-galactose malabsorption. They are not certified as vegan, as some tablet coatings may contain animal-derived ingredients — check the patient information leaflet or contact the manufacturer for the most up-to-date information. If you have specific dietary requirements, our vegan collection may offer suitable alternatives.

How Should You Use Rennie Heartburn, Indigestion & Wind Relief Tablets?

Using Rennie tablets correctly ensures you get the most effective relief from your symptoms. These tablets are designed to be chewed or sucked — not swallowed whole — so that the active ingredients can begin working as quickly as possible. Follow these steps each time you take a dose:

What Is the Correct Dose of Rennie Heartburn, Indigestion & Wind Relief Tablets?

The dose varies by age, and it is important to follow the guidance below carefully. Never exceed the maximum daily dose, as doing so increases the risk of side effects including raised calcium levels and digestive upset.

When Is the Best Time to Use Rennie Heartburn, Indigestion & Wind Relief Tablets?

Rennie tablets work best when taken as soon as symptoms begin. For most people, this means taking them after meals — particularly after eating spicy, fatty, or acidic foods — or at bedtime if nighttime heartburn is a problem. They are an as-needed remedy, not a preventative one, so there is no benefit to taking them before symptoms appear. If you find yourself needing them every day, this is a signal to speak to your GP about longer-term management.

How Long Can You Use Rennie Heartburn, Indigestion & Wind Relief Tablets For?

These tablets are intended for short-term, occasional use only. You should not take them continuously for more than 7 days without seeking medical advice. If your symptoms persist, worsen, or keep returning after stopping the tablets, it is important to see your GP, as this may indicate an underlying condition such as gastro-oesophageal reflux disease (GORD) or a peptic ulcer that requires a different treatment approach. Prolonged use of antacids without medical supervision is not recommended.

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 Heartburn, Indigestion & Wind Relief Tablets?

When taken as directed, Rennie tablets are well tolerated by most people. However, as with any medicine, some individuals may experience side effects. The most common ones are related to the antacid ingredients themselves.

  • Constipation — more likely with calcium carbonate, particularly if taken frequently
  • Diarrhoea — more likely with magnesium carbonate
  • Flatulence — occasionally reported, though simeticone is included specifically to reduce this

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

Less common side effects occur in a small number of users and are more likely with excessive or prolonged use beyond the recommended 7-day period. If you notice any of the following, stop taking the tablets and speak to your pharmacist or GP.

  • Nausea
  • Stomach cramps or abdominal discomfort
  • Rebound acid hypersecretion — where the stomach produces more acid after stopping antacids, temporarily worsening symptoms
  • Changes in bowel habits

What Are the Serious Side Effects of Rennie Heartburn, Indigestion & Wind Relief Tablets?

Serious side effects are rare when Rennie tablets are used correctly and for short periods. However, excessive or long-term use can lead to hypercalcaemia — abnormally high levels of calcium in the blood. This is more likely in people who already have conditions affecting calcium metabolism or kidney function.

Symptoms of hypercalcaemia include nausea, vomiting, weakness, confusion, increased thirst, and frequent urination. If you experience any of these symptoms, stop taking the tablets immediately and seek urgent medical advice. Allergic reactions to any ingredient are also possible, though rare — signs include rash, swelling of the face or throat, and difficulty breathing. Treat these as a medical emergency.

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

For mild side effects such as constipation or diarrhoea, stopping the tablets and staying well hydrated is usually sufficient. If side effects are persistent, troublesome, or unexpected, contact your pharmacist or GP for guidance. You can also report suspected side effects directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk. Never ignore side effects that feel serious or that do not resolve on their own.

Can Rennie Tablets Interact With Other Medicines?

Yes — antacids can interfere with the absorption of several other medicines. Calcium carbonate and magnesium carbonate can bind to certain drugs in the gut, reducing how much of the medicine enters your bloodstream. This is particularly relevant for tetracycline antibiotics, iron supplements, levothyroxine, bisphosphonates (such as alendronic acid), and digoxin. As a general rule, leave at least 2 hours between taking Rennie and any other oral medication — and up to 4 hours for some medicines. Always inform your pharmacist of all medicines you are taking, including supplements and herbal remedies.

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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