For the relief of indigestion, heartburn, nervous indigestion, hyperacidity, flatulence, upset stomach, dyspepsia, biliousness, overindulgence in food and drink, indigestion during pregnancy.

Posology:

Tablets to be taken orally, sucked or chewed.

Adults and Children over 12 years:

Two tablets to be sucked or chewed as a single dose, preferably to be taken one hour after meals and before going to bed but also in between in case of heartburn or gastric pain. A maximum daily dose of 8 g calcium carbonate, corresponding to 10 tablets a day, must not be exceeded.

Children

Not recommended for children under 12 years.

As with all antacids, if symptoms persist despite 14 days of continuous therapy, diagnostic measures are strongly recommended in order to rule out a more serious disease.

Rennie should not be administered to patients with:

• Hypersensitivity to any of the ingredients of the product

• Hypercalcaemia and/or conditions resulting in hypercalcaemia

• Nephrolithiasis due to calculi containing calcium deposits

• Severe renal insufficiency

• Hypophosphataemia

• Prolonged use should be avoided.

• The stated dose should not be exceeded. If, after 14 days of treatment, symptoms persist or only partly disappear the patient should consult a doctor.

• Caution should be exercised in patients with mild to moderate impairment of renal function (see section 4.3 – contraindication in severe renal insufficiency). If Rennie is used in such patients, plasma calcium, phosphate and magnesium levels should be regularly monitored.

• Long term uses at high doses can result in undesirable effects such as hypercalcaemia, hypermagnesaemia and milk-alkali syndrome, especially in patients with renal insufficiency.

• Rennie should not be used in patients with hypercalciuria (see also section 4.3). Prolonged use increases the risk of formation of renal calculi.

• This product should not be taken with large amounts of milk or dairy products.

• Patients with rare hereditary problems of fructose intolerance, glucose- galactose malabsorption or sucrase-isomaltase insufficiency should not take this medicine.

Changes in gastric acidity, such as that caused by the ingestion of antacids, can affect the rate and degree to which some concurrently administered medicines are absorbed.

• It has been shown that antacids which contain calcium or magnesium may form complexes with certain substances e.g. antibiotics (such as tetracyclines and quinolones), and cardiac glycosides (e.g. digoxin), bisphosphonates, dolutegravir, levothyroxine, and eltrombopag, resulting in decreased absorption. This should be borne in mind when concomitant administration is considered.

• Calcium salts reduce the absorption of fluorides and iron-containing products, and calcium salts and magnesium salts can hinder the absorption of phosphates.

• Thiazide diuretics reduce the urinary excretion of calcium. Due to an increased risk of hypercalcaemia, serum calcium should be regularly monitored during concomitant use of thiazide diuretics.

Therefore it is preferable to take the antacid separately from other drugs, allowing at least 4 hours before or after taking eltrombopag and a 1-2 hour interval for all other drugs.

Pregnancy

Animal studies do not indicate direct or indirect harmful effects with respect to reproductive toxicity.

No increased risks of congenital defects have been observed after the use of this product during pregnancy.

This medicine can be used during pregnancy if taken as instructed.

The maximum recommended daily dose should not be exceeded and should not be taken for more than 2 weeks. If symptoms persist or only partly disappear after 2 weeks, medical advice should be sought.

In order to prevent calcium overload, pregnant women should avoid concomitant excessive intake of milk and dairy products (1 litre of milk contains up to 1.2 g elemental calcium).

Breastfeeding

Calcium and magnesium are excreted in human milk, but at therapeutic doses of the product no effects on the breastfed newborns/infants are anticipated.

This medicine can be used during breastfeeding.

Fertility

There is no known evidence suggestive that at recommended dose this medicine has adverse effects on human fertility.

No effects on ability to drive and use machines have been observed.

The listed adverse drug reactions are based on spontaneous reports, thus an organisation according to CIOMS III categories of frequency is not possible.

Reporting of suspected adverse reactions

Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions 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.

Especially in patients with impaired renal function, prolonged use of high doses of calcium carbonate and magnesium carbonate can result in renal insufficiency, hypermagnesaemia, hypercalcaemia and alkalosis which may give rise to gastrointestinal symptoms (nausea, vomiting, constipation) and muscular weakness. In these cases, the intake of the product should be stopped and adequate fluid intake encouraged. In severe cases of overdosage (e.g. milk-alkali syndrome), a health care professional must be consulted because other measures of rehydration (e.g. infusions) might be necessary.

Pharmacotherapeutic Classification: Antacids

Calcium and magnesium carbonates react with excess acid in the gastric medium to produce soluble chlorides.

CaCO₃ + 2HCl => CaCl₂ + H₂O + CO₂

MgCO₃ + 2HCl => MgCl₂ + H₂O + CO₂

Calcium carbonate has a rapid and powerful neutralising action. This effect is increased by the addition of magnesium carbonate which also has a strong neutralising action.

In vitro acid neutralisation studies (artificial stomach model) showed that Rennie increases stomach pH from pH 1.5-2 to pH 3 in 40 seconds and is able to reach pH 4 in 1 minute 13 seconds. The maximum level of pH achieved in the model was pH 5.24.

In healthy volunteers, a significant increase in the pH of stomach contents above baseline pH was achieved between 1 and 6 minutes after dosing.

A small amount of calcium and magnesium may be absorbed, but in healthy subjects is usually rapidly excreted by the kidney.

The soluble chlorides produced by the reaction of calcium and magnesium with gastric acid react, in turn, with intestinal, biliary and pancreatic secretions to form insoluble salts, which are excreted in the faeces.

Preclinical studies on this medicine are not available. The available preclinical data on calcium carbonate and magnesium carbonate based on studies of repeated dose toxicity, genotoxicity and or carcinogenic potential, and toxicity to reproduction revealed no specific hazard at therapeutic doses for humans.

Sucrose

Glucose

Talc

Polyvidone (Povidone)

Peppermint Flavour 870652 (mint essential oil, maltodextrin, silicon dioxide, arabic gum)

Magnesium Stearate

Saccharin Sodium

None.

3 years.

Store below 25° C. Store in the original package.

Tablets are packed in a hard tempered aluminium foil (20µ m)/clear thermoformable PVC (150µ m) bubble pack, with six or twelve tablets per strip. 1, 2, 3, 4, 8, 10 or 12 strips are packed in a cardboard carton.

12 tablet Pocket Pack – tablets are packed in hard tempered aluminium foil (20µ m)/clear thermoformable PVC (250µ m) bubble pack, with six tablets per strip. Two strips are packed in a cardboard pocket pack.

Pack sizes: 6, 12, 24, 36, 48, 72, 96, 120, 144 tablets.

None.