Patient Leaflet Updated 08-Jul-2025 | Bayer plc
Rennie 750mg Medicated Chewing Gum
Rennie® 750 mg medicated chewing gum
Calcium carbonate
Always take this medicine exactly as described in this leaflet or as your doctor or pharmacist has told you.
1. What Rennie 750mg medicated chewing gum is and what it is used for
2. What you need to know before you take Rennie 750mg medicated chewing gum
3. How to take Rennie 750mg medicated chewing gum
4. Possible side effects
5. How to store Rennie 750mg medicated chewing gum
6. Contents of the pack and other information
Rennie 750mg medicated chewing gum is a sugar-free, mint-flavoured medicated chewing gum that gets to work within minutes to provide effective relief from heartburn, indigestion and acid reflux.
Each piece of gum contains an antacid - calcium carbonate - that works quickly and powerfully to neutralise excess acid in the stomach.
Please consult your doctor if you suffer frequently or need to use this medicine for more than 14 days in order to rule out more serious conditions.
Please consult your doctor or pharmacist if you have mild or moderate kidney problems as regular blood tests should be carried out.
To maximise the benefit of all medicines being used, take Rennie 750mg medicated chewing gum at least 4 hours before or after taking eltrombopag and 1 to 2 hours after taking any other medicines.
Avoid taking Rennie 750mg medicated chewing gum with large amounts of milk or dairy products.
Rennie 750mg medicated chewing gum can be used during pregnancy and breastfeeding if taken as instructed. As this product provides a substantial amount of calcium (300 mg per tablet) in addition to dietary calcium intake, pregnant women should strictly limit their use of this product to the maximum recommended daily dose and avoid concomitant, excessive intake of milk (1 litre contains up to 1.2 g calcium) and dairy products.
Rennie 750mg medicated chewing gum has no influence on the ability to drive and use machines.
This medicine contains 416 mg isomalt and 170 mg sorbitol in each chewing gum. Sorbitol is a source of fructose. If your doctor has told you that you (or your child) have an intolerance to some sugars or if you have been diagnosed with hereditary fructose intolerance (HFI), a rare genetic disorder in which a person cannot break down fructose, talk to your doctor before you (or your child) take or receive this medicine.
This medicine contains less than 1 mmol sodium (23 mg) per chewing gum, that is to say essentially sodium-free.
Chew 1 or 2 pieces of gum as required, after meals and before bedtime, for a minimum of 15 minutes.
Additional doses may be taken if the symptoms reoccur. Do not chew more than 10 gums per day.
Do not swallow the remaining gum; however, dispose of it sensibly. Do not take more than the label tells you to.
Children under 12 years: Not recommended.
If symptoms persist after 14 days consult your pharmacist or doctor. Prolonged use should be avoided.
Drink plenty of water and consult your doctor or pharmacist. Symptoms of an overdose include nausea and vomiting, tiredness, constipation and muscular weakness.
If you have any questions on the use of this medicine, ask your doctor or pharmacist.
Like all medicines, this medicine can cause side effects, although not everybody gets them. Side effects are unlikely at the recommended dose.
If you experience the following side effects stop treatment immediately and seek medical advice. Rarely allergic reactions to ingredients have been reported, e.g. rashes, itching, difficulty in breathing and swelling of the face, mouth or throat and anaphylactic shock (anaphylactic shock is a severe sudden allergic reaction, symptoms of which are low blood pressure, shock, palpitations, difficulty in breathing, bronchospasm, skin reactions, abdominal pain or cramps, vomiting and diarrhoea).
Long term use of high doses can cause high blood levels of calcium especially in people with kidney conditions. Symptoms of this may include nausea, vomiting, upset stomach, constipation, diarrhoea, tiredness, muscular weakness, headache, kidney problems and impaired sense of taste.
In exceptional cases long term use of high doses can lead to milk-alkali syndrome which can cause high blood levels of calcium.
If you get any side effects, talk to your doctor, pharmacist or nurse. This includes any possible side effects not listed in this leaflet. You can also report side effects directly via the Yellow Card Scheme at: www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store. By reporting side effects, you can help provide more information on the safety of this medicine.
Keep this medicine out of the sight and reach of children.
Store below 30°C and store in the original package.
Do not use this medicine after the expiry date which is stated on the carton and blister. The expiry date refers to the last day of that month.
Do not throw away any unused medicines via waste water or household waste. Ask your pharmacist how to throw away medicines you no longer use. These measures will help protect the environment.
The active substance per chewing gum is 750 mg calcium carbonate.
The other ingredients are acesulfame potassium, isomalt, menthol flavour, copovidone, sorbitol, sucralose, magnesium stearate, brilliant blue FCF colourant, peppermint extra flavour and chewing gum base.
Rennie 750mg medicated chewing gum are round bi-layered medicated chewing-gums, made of a speckled blue layer and a white layer embossed with “750”.
Rennie 750mg medicated chewing gum is available in packs of 10 or 20 pieces of gums.
Not all pack sizes may be marketed.
Bayer
This leaflet was last revised in January 2025
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