Rennie: Uses, Mechanism of Action, Precautions, Administration and Side Effects

This medicine is available without a prescription. However, you should still take the soft chewable tablets carefully for the best results.

Ask your pharmacist if you need more information or advice. You should contact a doctor if your symptoms worsen or do not improve. If you have any unusual effects after taking Rennie, tell your doctor or pharmacist.

What are rennie soft chewable tablets and what are they used for?

They are soft and chewable antacid tablets , with a mild fresh mint flavor, that quickly and effectively relieve the discomfort of indigestion, heartburn, acid indigestion, dyspepsia , nervous indigestion, flatulence, stomach upset, indigestion during pregnancy and bile.

Containing antacid to neutralize excess stomach acid, Rennie’s Peppermint Tablets work fast to relieve symptoms of heartburn and indigestion .

Rennie’s peppermint tablets contain two antacids called calcium carbonate and magnesium carbonate that neutralize stomach acid by turning it into water. They act directly in the esophagus and stomach and are then eliminated by your body.

Relief of symptoms such as stomach pain, bloating, and feeling sick associated with indigestion, heartburn, and flatulence (wind, excess gas).

This includes indigestion caused by overindulgence in food or drink, heartburn in pregnancy, and nervous indigestion.

Mechanism of action

Rennie’s Peppermint, Rennie’s Peppermint, and Rennie’s Ice Tablets contain two active ingredients, calcium carbonate and magnesium carbonate. These are medicines called antacids. They work by binding and neutralizing excess acid produced by the stomach.

Stomach acid is produced in the stomach as a normal part of the digestive process, but too much can cause symptoms like heartburn, indigestion, and wind.

By neutralizing acid, Rennie products help relieve pain and discomfort associated with excess stomach acid. They work as soon as they reach the stomach.

Before taking rennie soft chewable tablets

Indigestion and heartburn can sometimes be symptoms of more serious conditions, such as stomach ulcers or stomach cancer. For this reason, you should consult your doctor before taking this medicine if any of the following apply to you:

  • You are 55 years of age or older and have recently changed symptoms of indigestion or heartburn.
  • You have needed to use heartburn or indigestion remedies continuously for two or more weeks to control your symptoms.
  • You have difficulty swallowing or pain, you have persistent stomach pain or involuntary weight loss associated with indigestion, you have blood in your stools or black tarry stools, you have persistent vomiting or vomiting, you have had a peptic ulcer in the past.
  • You are taking a non-steroidal anti-inflammatory drug (NSAID), for example aspirin, ibuprofen, diclofenac, indomethacin, naproxen, azapropazone, piroxicam, ketoprofen.

Do not take Rennie soft chewable tablets:

  • If you have severe kidney disease.
  • If you have a high level of calcium in the urine or kidney stones.
  • If you have high levels of calcium or low levels of phosphate in your blood.
  • If you are allergic (hypersensitive) to any of the ingredients.

Special precautions:

Do not exceed the indicated dose. Rennie soft chewable tablets should not be used for a long period of time without consulting a doctor. Consult your doctor or pharmacist if you have kidney problems.

This product contains sucrose and glucose. If your doctor has told you that you have an intolerance to some sugars, contact your doctor before taking this medicine. If symptoms persist consult your doctor.

Taking other medications:

Please inform your doctor or pharmacist if you are taking or have recently taken any other medicines, including medicines obtained without a prescription.

  • If you are taking any of the following medicines, talk to your doctor or pharmacist before taking Rennie soft chewable tablets as it may affect the way these medicines work.
  • Tetracyclines and quinolones (antibiotics), Digoxin (used for some heart conditions). Thiazide diuretics (water tablets to treat fluid retention and high blood pressure).
  • Fluorides (to prevent tooth decay), phosphates (to clean the intestine before a surgical procedure), iron supplements.

To maximize the benefit of all medications you use, take Rennie’s soft chewable tablets 1 to 2 hours after taking any other medications.

Antacids can reduce the absorption of many other medications from the gut, which can make the other medications less effective. If you take other medicines, consult your pharmacist before taking Rennie antacids.

Antacids should not be taken at the same time as any other medicine. In general, any interaction can be avoided if you do not take Rennie products in the past two hours and after taking any other medications.

This is particularly important for the following medications:

  • Atazanavir, azithromycin, bisphosphonates, eg alendronate, etidronate, cefpodoxime, chloroquine, chlorpromazine, dipyridamole, eltrombopag, enteric-coated tablets, erlotinib, fexofenadine, gabapentin, hydroxychloroquine.
  • Iron preparations, eg, ferrous sulfate, ferrous fumarate, ferrous gluconate, itraconazole, ketoconazole, levothyroxine, mycophenolate, penicillamine.
  • Quinolone-type antibiotics, for example, ciprofloxacin, norfloxacin, nalidixic acid, moxifloxacin (avoid taking Rennie tablets in the previous six hours or two hours after taking a dose of one of these antibiotics).
  • Rifampicin, rilpivirine, rosuvastatin, sodium fluoride, strontium ranelate, sulpiride, tetracycline-type antibiotics, eg doxycycline, minocycline, tetracycline, tipranavir, zinc.

How to take rennie soft chewable tablets

The usual dose is one to two tablets, up to 3-4 times a day. This medicine is for adults only, it is not recommended for use in children and adolescents under 18 years of age.

Long-term use should be avoided. Do not exceed the indicated dose of a maximum of eleven tablets per day. If symptoms persist after seven days, further medical attention should be sought.

Adults and children over 12 years : 1-2 tablets to suck or chew, as required, preferably 1 hour after meals and before bedtime. For heartburn. 2 additional tablets can be taken between these times. Take no more than 10 tablets a day.

Children under 12 years : Not recommended. If symptoms persist after 14 days, consult your pharmacist or doctor. Prolonged use should be avoided.

Pregnancy and breastfeeding : Rennie’s soft chewable tablets can be used during pregnancy and breastfeeding, to relieve indigestion and heartburn associated with pregnancy if taken as instructed.

However, if you are pregnant, always talk to your doctor or pharmacist before taking any medication and make sure you do not take more than the recommended dose.

It’s best to avoid consuming excessive amounts of milk and other dairy products at the same time as you are taking these Rennie products, just to make sure the calcium level in your blood doesn’t get too high.

If you take more Rennie tablets than you should : drink plenty of water and consult your doctor or pharmacist. Symptoms of an overdose include nausea and vomiting, tiredness, constipation, and weakness.

The tablets can be sucked or chewed. Do not exceed recommended dose. If your symptoms persist or worsen despite taking Rennie tablets, you should consult your doctor. If you have any questions on the use of this product, ask your doctor or pharmacist.

Possible side effects

Like all medicines, Rennie’s soft chewable tablets can cause side effects, although not all get them. Side effects are unlikely at the recommended dose. If you experience the following side effects stop treatment immediately and seek medical advice.

Medicines and their possible side effects can affect individual people in different ways. Just because a side effect is listed here does not mean that everyone using this drug will experience that or any side effect.

Allergic reactions to the ingredients, rashes, itching, shortness of breath and swelling of the face, mouth or throat and anaphylaxis have been reported in rare cases.

Shock (anaphylactic shock is a severe sudden allergic reaction, symptoms of which are low blood pressure, shock, palpitations, shortness of breath, bronchospasm, skin reactions, abdominal pain or cramps, vomiting and diarrhea).

Long-term use of high doses can cause high levels of calcium in the blood, especially in people with kidney problems.

Symptoms of this can include nausea, vomiting, upset stomach, diarrhea, tiredness, muscle weakness, headache, kidney problems, and problems with the sense of taste.

In rare cases, long-term use of high doses can lead to milk alkaline syndrome, which can cause high levels of calcium in the blood. To learn more about other possible risks associated with this medicine, please read the information that is provided with the medicine.

Side effect reports

If you have any side effects, talk to your doctor, pharmacist or nurse. This includes any possible side effects not mentioned in this list.

You can also report side effects directly via the yellow card scheme at: By reporting side effects you can help provide more information on the safety of this medicine.

Who shouldn’t take Rennie?

Children under 12 years old. People with kidney problems (unless prescribed by your doctor). People with low levels of phosphate in the blood (hypophosphatemia).

People with very high levels of calcium in the urine (hypercalciuria) or kidney stones that contain calcium. Check with your doctor before taking this medicine if you have a history of kidney stones.

People with high levels of calcium in the blood (hypercalcaemia), for example as a result of bone marrow cancer, cancer that has spread to the bones, or overactive parathyroid glands (hyperparathyroidism).

People who are allergic to any ingredient in the medicine. Check the ingredients in the leaflet provided with the medicine if you know you have specific allergies.

How to store Rennie’s soft chewable tablets

Keep out of the reach and sight of children. Do not store above 25ºC. Do not use Rennie soft chewable tablets after the expiration date on the packaging and packaging. The expiration date refers to the last day of that month.

Medicines should not be disposed of via sewage or household waste. Asking your pharmacist how to dispose of medications is no longer necessary. These measures will help protect the environment.

Additional Information

What Rennie’s Soft Chewable Tablets Contain : Each tablet contains the active ingredient: Calcium Carbonate 800mg, or Calcium Carbonate 680mg, Magnesium Carbonate 80mg, Sucrose and Glucose 250mg.

The other ingredients are : sucrose (1.72 g), glucose syrup (equivalent to not more than 1.83 g of glucose per tablet), hydrogenated vegetable oil, lecithin, mint flavor, water, brilliant blue (E133), quinoline yellow (E104), purified talc, glycerol.

What Rennie looks like and the contents of the package : Rennie tablets are square, soft chewable tablets. Rennie chewable tablets are available in packs of 8, 24, 32, 40, 48, 56 and 64 quantities. Not all pack sizes can be marketed.

Marketing Authorization Holder and Manufacturer : Bayer plc, Consumer Services Division, Bayer House, Strawberry Hill, Newbury, Berkshire, RG14 1JA, UK.