Skip to product information
1 of 1

  • Images are for illustration purposes only

Rennie Deflatine-36 tablets

Rennie Deflatine-36 tablets

  • 1. Ozempic®️-equivalent therapy now available for weight management
  • 2. Average weight loss of 17%, with 1 in 3 patients achieving over 20%
  • 3. May help reduce osteoarthritis-related pain
  • 4. Wegovy®️ is not expected to impact the effectiveness of oral contraceptives
  • 5. Supports cardiovascular risk reduction
  • 6. Over 22 million patients treated with semaglutide-based therapies since 2018

  • ✔️ Relieves heartburn and trapped wind simultaneously with one tablet
  • ✔️ Dual-action formula combines antacid with simethicone for gas relief
  • ✔️ Chewable tablets work quickly after meals and at bedtime
  • ✔️ Suitable for adults and young people aged 12 and over
  • ✔️ Convenient 36-tablet pack for ongoing symptom management at home

Price Checker

Regular price £6.91
Sale price £6.91
Sale Sold out
  • Lowest price guarantee
  • Includes FREE private prescription
View full details

 

What Is Rennie Deflatine Trapped Wind Tablet?

 

If you've ever sat through a meal only to spend the next hour uncomfortable with bloating, burning, or that nagging pressure of trapped gas, you'll know how disruptive it can be. Rennie Deflatine trapped wind tablets are an over-the-counter remedy designed to tackle two of the most common digestive complaints at once — heartburn and trapped wind. Each pack contains 36 chewable tablets, making it a practical option to keep at home or in your bag. You can browse our full range of indigestion treatments if you're looking for additional options alongside this product.

Rennie Deflatine is manufactured by Bayer and is widely used across the UK. It combines a trusted antacid formula with simethicone, an ingredient specifically included to address the discomfort of excess gas. It's a P-class medicine, meaning it's available without a prescription but should be used as directed.

 

How Does Rennie Deflatine Work to Relieve Symptoms?

 

Rennie Deflatine works through a dual mechanism, addressing both excess stomach acid and trapped intestinal gas simultaneously. Here's how each active ingredient contributes:

  • Calcium carbonate (680 mg per tablet): A well-established antacid that neutralises excess hydrochloric acid in the stomach, reducing the burning sensation associated with heartburn and acid indigestion.
  • Heavy magnesium carbonate (80 mg per tablet): Works alongside calcium carbonate to provide additional acid-neutralising action, helping to restore a more comfortable stomach pH.
  • Simethicone (25 mg per tablet): An antifoaming agent that causes small gas bubbles in the gut to coalesce into larger ones, making them far easier to expel naturally — relieving that uncomfortable bloated, full feeling.

The tablets are chewed or sucked rather than swallowed whole, which means the active ingredients begin working in the mouth and upper digestive tract almost immediately. This is why many people notice relief relatively quickly after taking them.

 

Who Is Rennie Deflatine Suitable For?

 

Rennie Deflatine is suitable for adults and young people aged 12 and over who experience occasional heartburn, acid indigestion, or trapped wind. It's particularly useful after large or rich meals, or when symptoms flare up at night. That said, it's not appropriate for everyone.

  • Adults aged 18 and over experiencing occasional heartburn or indigestion
  • Adolescents aged 12–17 under appropriate supervision
  • People who need relief from both acid symptoms and trapped gas simultaneously
  • Those who prefer a chewable tablet over liquid antacid preparations

It is not suitable for children under 12, people with severe kidney impairment, or those with hypercalcaemia (raised blood calcium levels). If you're unsure whether this product is right for you, speak to your pharmacist before purchasing.

 

How Does Rennie Deflatine Compare to Standard Rennie Tablets?

 

Feature Rennie Deflatine Standard Rennie
Active ingredients Calcium carbonate, magnesium carbonate, simethicone Calcium carbonate, magnesium carbonate
Treats trapped wind Yes No
Treats heartburn/indigestion Yes Yes
Suitable for age 12+ Yes Yes

 

How Should You Store Rennie Deflatine and Is It Clinically Suitable for You?

 

Store Rennie Deflatine 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. If you have a long-term digestive condition such as irritable bowel syndrome, you may also find it helpful to explore our IBS and cramps collection for complementary products.

Rennie Deflatine trapped wind tablets are a short-term remedy. If your symptoms are frequent, severe, or accompanied by other signs such as difficulty swallowing, unexplained weight loss, or persistent vomiting, you should seek medical advice rather than relying on an over-the-counter product.

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 Deflatine 36 Tablets specifications
Treatment category Antacid / Antifoaming agent
Mechanism of action Neutralises stomach acid; disperses trapped intestinal gas
Effective for Heartburn, acid indigestion, trapped wind, bloating
Suitable for Adults and children aged 12 and over
Active ingredients Calcium carbonate 680 mg, heavy magnesium carbonate 80 mg, simethicone 25 mg per tablet
Pack size 36 tablets
UK classification Pharmacy (P) medicine
Drug class Antacid with antifoaming agent
Preparation Chewable tablet
Route of administration Oral

Specifications of Rennie Deflatine 36 Tablets

 

What Is Rennie Deflatine and What Is It Used For?

 

Rennie Deflatine 36 tablets is an over-the-counter medicine used to relieve the symptoms of heartburn, acid indigestion, and trapped wind in adults and children aged 12 and over. It contains three active ingredients: calcium carbonate, heavy magnesium carbonate, and simethicone. The antacid components neutralise excess stomach acid, while simethicone helps disperse uncomfortable gas bubbles in the digestive tract. It is not a treatment for the underlying cause of these symptoms — it provides symptomatic relief only.

Heartburn is a common condition in the UK, often triggered by certain foods, alcohol, smoking, or lying down after eating. Trapped wind can occur alongside indigestion or independently, causing bloating and abdominal discomfort. Rennie Deflatine addresses both at the same time, which is why many people find it more convenient than using separate products.

 

What Do You Need to Know Before Using Rennie Deflatine?

 

Before taking Rennie Deflatine, read the following carefully. Do not take this medicine if any of the following apply to you:

  • You are allergic to calcium carbonate, magnesium carbonate, simethicone, or any other ingredient in the tablets
  • You have hypercalcaemia (high levels of calcium in your blood)
  • You have severe kidney disease or kidney failure
  • You are under 12 years of age
  • You have been told by a doctor to follow a low-calcium diet

The following medicines may interact with Rennie Deflatine. Take them at least 2 hours before or after this product:

  • Tetracycline antibiotics (e.g. doxycycline)
  • Iron supplements
  • Certain medicines for osteoporosis (bisphosphonates)
  • Some antifungal medicines (e.g. ketoconazole)
  • Thyroid medicines (e.g. levothyroxine)

Speak to your pharmacist or GP if you are taking any other medicines, including herbal remedies or supplements, before using this product.

 

How Should You Use Rennie Deflatine Correctly?

 

Always use Rennie Deflatine exactly as described in the patient information leaflet or as directed by your pharmacist. Do not exceed the stated dose.

  1. Chew or suck 2 tablets thoroughly — do not swallow them whole.
  2. Take after meals and at bedtime, or when symptoms occur.
  3. Allow the tablets to dissolve fully in your mouth before swallowing.
  4. Do not take more than 8 tablets in any 24-hour period.
  5. If symptoms persist beyond 7 days, stop use and consult your GP.
Indication Age Group Dose Frequency
Heartburn / indigestion / trapped wind Adults and children 12+ 2 tablets After meals and at bedtime; max 8 tablets/24 hrs
Not applicable Under 12 years Do not use

 

What Are the Possible Side Effects of Rennie Deflatine?

 

Like all medicines, Rennie Deflatine can cause side effects, although not everyone experiences them. Most people tolerate it well when taken as directed. If you're managing multiple digestive symptoms, you might also find our sickness and nausea collection useful for related concerns.

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

  • Constipation
  • Diarrhoea
  • Flatulence (passing wind) — this is actually part of the intended action of simethicone

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

  • Nausea
  • Stomach discomfort
  • Hypercalcaemia with prolonged high-dose use (symptoms include thirst, frequent urination, muscle weakness)
  • Allergic reactions such as skin rash or itching — stop use immediately and seek medical advice if this occurs

If you notice any side effect not listed here, or if a listed side effect becomes severe, contact your pharmacist or GP promptly.

 

How Should You Store Rennie Deflatine Safely?

 

Correct storage helps maintain the quality and effectiveness of the tablets throughout their shelf life. 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 carton or blister strip
  • Do not dispose of medicines via wastewater or household waste — return unused tablets to your pharmacy

If you're looking to support your overall digestive health alongside short-term symptom relief, it may be worth exploring vitamins and supplements that support gut function, such as probiotics — though always check with your pharmacist first.

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 Deflatine 36 tablets online in the UK?

You can buy Rennie Deflatine 36 tablets directly from Cured Pharmacy, a GPhC-registered UK online pharmacy. No prescription is required as it is an over-the-counter (P) medicine. Simply add it to your basket and it will be dispatched to your door.

How does Rennie Deflatine work in the body?

Rennie Deflatine works through two mechanisms. The antacid ingredients — calcium carbonate and heavy magnesium carbonate — neutralise excess stomach acid to relieve heartburn and indigestion. Simethicone, the third active ingredient, acts as an antifoaming agent that breaks up trapped gas bubbles in the gut, making them easier to pass naturally.

How do I use Rennie Deflatine step by step?

Chew or suck 2 tablets after meals and at bedtime, or whenever symptoms occur. Do not swallow the tablets whole — they need to dissolve in your mouth to work effectively. Never exceed 8 tablets in a 24-hour period.

What is the correct dose of Rennie Deflatine for adults?

The recommended dose for adults and young people aged 12 and over is 2 tablets, taken after meals and at bedtime. The maximum dose is 8 tablets in any 24-hour period. Do not use in children under 12 years of age.

When is the best time to take Rennie Deflatine?

Rennie Deflatine is most effective when taken after meals and at bedtime, as these are the times when stomach acid production and gas build-up are most likely to cause discomfort. You can also take it as soon as symptoms appear at any other time of day, within the maximum daily dose.

What are the side effects of Rennie Deflatine and how do I manage them?

The most commonly reported side effects are constipation and diarrhoea, though these are uncommon. Passing wind may also occur, which is actually a sign that the simethicone is working as intended. If you experience persistent or severe side effects, stop taking the tablets and speak to your pharmacist or GP.

Who should not take Rennie Deflatine?

Rennie Deflatine is not suitable for children under 12 years, people with severe kidney disease, those with hypercalcaemia, or anyone with a known allergy to any of the ingredients. If you have a long-term health condition or take regular medication, always check with your pharmacist before use.

Can I take Rennie Deflatine during pregnancy or breastfeeding?

You should speak to your doctor or midwife before taking Rennie Deflatine if you are pregnant or breastfeeding. While antacids are sometimes considered during pregnancy, professional guidance is important to ensure the product is appropriate for your individual circumstances.

How long can I use Rennie Deflatine for?

Rennie Deflatine is intended for short-term, symptomatic relief only. If your symptoms persist for more than 7 days, worsen, or are accompanied by other symptoms such as difficulty swallowing or unexplained weight loss, you should stop use and consult your GP, as these may indicate an underlying condition requiring investigation.

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

If you take more than the recommended dose, contact NHS 111 or your nearest A&E department for advice. Taking too much calcium carbonate over time can lead to hypercalcaemia, which causes symptoms such as excessive thirst, frequent urination, and muscle weakness. Always keep medicines out of reach of children.

Can Rennie Deflatine interact with other medicines I am taking?

Yes, Rennie Deflatine can affect the absorption of certain medicines, including tetracycline antibiotics, iron supplements, bisphosphonates, some antifungals, and levothyroxine. To avoid this, take those medicines at least 2 hours before or after Rennie Deflatine. Always inform your pharmacist of all medicines you are taking.

Is Rennie Deflatine suitable for people with IBS?

Rennie Deflatine may provide some relief from gas and bloating associated with IBS, but it is not specifically licensed for IBS management. If you have IBS, you may benefit from exploring our IBS and cramps collection for products more specifically suited to your condition. Always discuss ongoing digestive symptoms with your GP.

What are the alternatives to Rennie Deflatine for trapped wind?

Alternatives for trapped wind include products containing simethicone alone (such as Infacol for infants, though not for adults), or activated charcoal tablets. For heartburn specifically, other antacids such as Gaviscon or Tums may be considered. You can browse our full indigestion range to compare available options.

Does Rennie Deflatine contain any allergens or animal-derived ingredients?

Rennie Deflatine tablets contain sucrose and may not be suitable for people with rare hereditary fructose intolerance, glucose-galactose malabsorption, or sucrase-isomaltase deficiency. Always check the full ingredients list on the packaging. If you have specific dietary concerns, speak to your pharmacist before use.

What is the latest guidance on using antacids for heartburn relief?

The NHS advises that antacids are a suitable first-line option for occasional heartburn and indigestion, providing short-term symptom relief. They are not a substitute for lifestyle changes such as avoiding trigger foods, eating smaller meals, and not lying down immediately after eating. If symptoms are frequent or severe, a GP may recommend a proton pump inhibitor (PPI) instead.

How Should You Use Rennie Deflatine?

Rennie Deflatine tablets are chewed or sucked — never swallowed whole. Allowing the tablet to dissolve in your mouth means the active ingredients can begin working in the upper digestive tract as quickly as possible. Follow these steps each time you take a dose:

If you find the taste unpleasant, a small sip of water after taking the tablets is perfectly acceptable. Do not crush the tablets and mix them into food or drink, as this may affect how well they work.

What Is the Correct Dose of Rennie Deflatine?

The dose is the same whether you are treating heartburn, indigestion, or trapped wind. Always stick to the recommended amount — taking more will not speed up relief and may increase the risk of side effects.

If you need more than 8 tablets in a day to control your symptoms, this is a sign that you should speak to your GP rather than increasing your dose independently.

When Is the Best Time to Use Rennie Deflatine?

Rennie Deflatine is most effective when taken after meals and at bedtime. Stomach acid production tends to peak after eating, and lying down at night can allow acid to travel upwards more easily, worsening heartburn. Taking the tablets at these times helps intercept symptoms before they become severe. You can also take a dose as soon as symptoms appear at any other point during the day, provided you stay within the maximum daily limit of 8 tablets.

Avoid taking Rennie Deflatine at the same time as other medicines — particularly tetracyclines, iron supplements, or levothyroxine. Leave at least a 2-hour gap between Rennie Deflatine and these medicines to prevent any reduction in their absorption.

How Long Can You Use Rennie Deflatine For?

Rennie Deflatine is designed for short-term, occasional use. It is not intended as a long-term solution for chronic digestive conditions. If you find yourself needing it daily for more than 7 consecutive days, or if your symptoms are not improving, you should stop use and consult your GP. Persistent heartburn or indigestion may require investigation and a different treatment approach, such as a proton pump inhibitor prescribed by your doctor.

Lifestyle changes — such as eating smaller meals, avoiding fatty or spicy foods, reducing alcohol intake, and not lying down immediately after eating — can help reduce how often you need to reach for an antacid.

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

Customer Reviews

Based on 1 review
0%
(0)
100%
(1)
0%
(0)
0%
(0)
0%
(0)
A
Anonymous

good product not too difficult to negotiate the website.good value for money but did not arrive until several days after the 24hr delivery I paid for,

What Are the Most Common Side Effects of Rennie Deflatine?

Most people who take Rennie Deflatine as directed do not experience significant side effects. However, as with any medicine, some people may notice changes in their digestive function. The most commonly reported effects relate to bowel habit.

  • Constipation — calcium carbonate can slow bowel movements in some people
  • Diarrhoea — magnesium carbonate has a mild laxative effect that may cause loose stools
  • Increased flatulence — this is often a sign that simethicone is working, as it helps gas escape more easily

These effects are generally mild and tend to resolve on their own. Drinking plenty of water and maintaining a balanced diet can help minimise constipation in particular.

What Are the Less Common Side Effects of Rennie Deflatine?

Less commonly, some people may experience the following. If any of these occur and are persistent or troubling, stop taking the tablets and seek advice from your pharmacist or GP.

  • Nausea or stomach discomfort
  • Skin rash, itching, or hives — which may indicate an allergic reaction
  • Swelling of the face, lips, or throat — seek emergency medical help immediately if this occurs
  • Rebound acid hypersecretion with prolonged use (stomach producing more acid after stopping)

What Are the Serious Side Effects of Rennie Deflatine?

Serious side effects are rare when Rennie Deflatine is used as directed for short periods. However, taking high doses over a prolonged period can lead to hypercalcaemia — an abnormally high level of calcium in the blood. This is more likely if you are also taking calcium supplements or vitamin D alongside this product.

  • Excessive thirst and dry mouth
  • Frequent urination
  • Muscle weakness or cramps
  • Confusion or difficulty concentrating
  • Nausea and vomiting

If you experience any of these symptoms, stop taking Rennie Deflatine immediately and contact your GP or call NHS 111.

What Should You Do If You Experience Side Effects?

If you notice a side effect that is mild and manageable, you may be able to continue taking the tablets while monitoring the symptom. However, if any side effect is severe, unexpected, or does not resolve, you should stop use and seek medical advice promptly. 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 for everyone.

Can Rennie Deflatine Interact With Other Medicines?

Yes. Rennie Deflatine can reduce the absorption of certain medicines if taken at the same time. This is because the calcium and magnesium in the antacid can bind to other drugs in the gut, preventing them from being properly absorbed into the bloodstream. To avoid this, always leave a gap of at least 2 hours between taking Rennie Deflatine and any of the following:

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

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

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

We’re a safe and
regulated UK service

Registered Pharmacy Badge

Lowest Price Guarantee

We're convinced you won't find your treatment cheaper, but if you do we'll refund the difference.

Find out more

100% discreet packaging

We're convinced you won't find your treatment cheaper, but if you do we'll refund the difference.

Find out more

Agent

Need help?
Talk to our friendly experts now

How our service works

Service Setup

Service setup

Discreet Packaging

Discreet packaging

Express Delivery

Express delivery