Frequently asked questions about Rennie

How does Rennie [Peppermint/Spearmint/Sugar Free/Ice] work?

Rennie is an antacid which gets to work in the stomach, neutralising excess stomach acid to help remove the discomfort of heartburn & indigestion.

Is Rennie suitable for children?

Rennie is not recommended for use in children and adolescents below age 18.

Does Rennie contain aspartame?

No, Rennie products do not contain aspartame.

Is Rennie suitable for vegetarians?

Yes, all Rennie products are suitable for vegetarians.

Is Rennie suitable for vegans?

Yes, all Rennie products are suitable for vegans.

Can Rennie be taken in pregnancy?

Rennie is suitable for use when suffering from heartburn during pregnancy if taken as instructed. However, if you are pregnant medicines can affect the unborn baby so always talk to your doctor or pharmacist before taking any medicine in pregnancy.

Can Rennie be taken while breast feeding?

Rennie is suitable for use during breast feeding if taken as instructed.

Does Rennie contain sugar?

Most of the Rennie range does contain a small amount of sugar; however, Rennie Sugar Free and Rennie Deflatine do not contain any sugar.

Is Rennie suitable for diabetics?

Rennie Sugar Free and Rennie Deflatine do not contain any sugar. We have no specific advice for individuals with diabetes and therefore recommend they contact their healthcare professional for advice.

How many tablets can I take in a day?

The number of tablets you should take in a day depends on which product you are using. If using Rennie Peppermint, Rennie Spearmint, Rennie Ice or Rennie Sugar Free Spearmint do not take more than eleven tablets a day. If using Rennie Orange do not take more than eleven tablets a day. If using Rennie Deflatine do not take more than eleven tablets a day.

Can I take Rennie at night?

Yes, Rennie can be taken at night, neutralising excess stomach acid to help remove the discomfort of heartburn & indigestion.

What is Rennie Deflatine?

Rennie Deflatine provides effective relief from the symptoms of trapped wind such as bloating and flatulence, as well as offering the same relief from heartburn & indigestion as other Rennie products..

Rennie and Antacids FAQs

See some of the most commonly asked questions on antacids, helping you get the best treatment for symptoms of heartburn and indigestion.

You’ll find lots of information about all the conditions Rennie tablets can treat throughout the website.

Frequently asked questions on Antacids

What is an antacid

An antacid is a substance which neutralises stomach acid.

What are alginates?

Alginates are active ingredients that form a protective layer on top of the stomach contents to help reduce acid reflux.

What happens if I keep taking antacids for a long time?

Antacids will only manage your symptoms rather than curing a problem. If your symptoms persist for longer than 14 days in a row you need to see your GP just to check there is no underlying cause. You doctor will be able to advise you on an ongoing management approach.

How will my GP/ Pharmacist help with my heartburn & indigestion?

Your GP can review your lifestyle and treatments used so far. They may suggest you continue to use antacids and might also offer you suitable medication, or refer you to a specialist if necessary.

What is the difference between heartburn & indigestion?

Although people often use the terms interchangeably, there is a difference between heartburn and indigestion.


Indigestion causes heartburn - the burning feeling or heat that begins in your chest or throat and occurs in waves. Most often this happens when acid from the stomach rises into the oesophagus and upwards to cause pain and discomfort.


Indigestion is literally an ‘inefficient digestion’ and is a general term used for a collection of symptoms that include heartburn, but covers any pain or discomfort felt in the stomach region after meals. It is often triggered by eating or drinking things that make the stomach produce large amounts of acid, such as spicy foods or alcohol.