- sodium alginate
- calcium carbonate
- sodium bicarbonate
GSL: General Sales Licence
This information is intended for use by health professionals
Gaviscon Double Action Tablets.
Each tablet contains sodium alginate 250 mg, sodium bicarbonate 106.5 mg and calcium carbonate 187.5 mg.
Aspartame (E951) 5.863mg per tablet
Carmoisine Lake (E122) 0.375mg per tablet
For a full list of excipients, see Section 6.1.
A flat, circular, bi-layer tablet with bevelled edges. One layer of the tablet is pink and slightly mottled, and the other white.
Treatment of acid related symptoms of gastro-oesophageal reflux such as acid regurgitation, heartburn and indigestion, for example following meals or during pregnancy.
For oral administration, after being thoroughly chewed.
Adults and children 12 years and over: Two to four tablets after meals and at bedtime, up to four times per day.
Children under 12 years: Should be given only on medical advice.
Elderly: No dose modifications necessary for this age group.
This medicinal product is contraindicated in patients with known or suspected hypersensitivity to the active substances or to any of the excipients listed in section 6.1.
The sodium content of a two-tablet dose is 110.75 mg (4.82 mmol). This should be taken into account when a highly restricted salt diet is recommended, e.g. in some cases of congestive cardiac failure and renal impairment.
Each two-tablet dose contains 150 mg (3.75 mmol) of calcium. Care needs to be taken in treating patients with hypercalcaemia, nephrocalcinosis and recurrent calcium containing renal calculi.
Due to its aspartame content this product should not be given to patients with phenylketonuria.
If symptoms do not improve after seven days, the clinical situation should be reviewed.
Prolonged use should be avoided.
As with other antacid products, taking Gaviscon Double Action Tablets can mask the symptoms of other more serious, underlying medical conditions.
Gaviscon Double Action Tablets should not be used in the following cases:
• Patients with server/impaired renal function/-insufficiency
• Patients with hypophosphatemia
There is a possibility of reduced efficacy in patients with very low levels of gastric acid.
There is increased risk for hypernatremia in children with gastroenteritis or suspected renal insufficiency.
Treatment of children younger than 12 years of age is not generally recommended, except on medical advice.
Due to the presence of calcium and carbonates which act as an antacid, a time-interval of 2 hours should be considered between Gaviscon intake and the administration of other medicinal products, especially H2-antihistaminics, tetracyclines, digoxine, fluoroquinolone, iron salts, thyroid hormones, ketoconazole, neuroleptics, thyroxine, penicilamine, beta-blockers (atenolol, metoprolol, propanolol), glucocorticoid, chloroquine, estramustine and diphosphonates. See also section 4.4.
A moderate amount of data on pregnant women (between 300-1000 pregnancy outcomes) indicate no malformative or feto/neonatal toxicity of the active substances.
Based on this and previous experience the medicinal product may be used during pregnancy and lactation, if clinically needed.
Nevertheless, taking into account the presence of calcium carbonate it is recommended to limit the treatment duration as much as possible.
No effects of the active substances have been shown in breastfed newborns/infants of treated mothers. This product can be used during breast-feeding.
Pre-clinical animal investigations have revealed alginate has no negative effect on parental or offspring fertility or reproduction.
Clinical data do not suggest that this product has an effect on human fertility.
This product has no or negligible influence on the ability to drive and use machines.
Adverse events which have been associated with sodium alginate, sodium bicarbonate and calcium carbonate are given below, tabulated by system organ class and frequency. Frequencies are defined as: Very common (≥1/10); Common (≥1/100 and <1/10); Uncommon (≥1/1000 and <1/100); Rare ≥1/10,000 and <1/1000); Very rare (<1/10,000); Not known (cannot be estimated from the available data). Within each frequency grouping, adverse events are presented in order of decreasing seriousness.
System Organ Class
Immune System Disorders
Anaphylactic reaction, anaphylactoid reaction. Hypersensitivity reactions such as urticaria.
Metabolism and Nutritional Disorders
Alkalosis1, Hypercalcaemia1, Milk-alkali Syndrome1
Respiratory, Thoracic and Mediastinal Disorders
Respiratory effects such as bronchospasm.
Abdominal pain, acid rebound, diarrhoea, nausea, vomiting
Skin and Subcutaneous Tissue Disorders
Description of Selected Adverse Reactions
1 Usually occurs following larger than recommended dosages.
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
Some abdominal distension may be noticed.
In the event of overdosage symptomatic treatment should be given
Pharmacotherapeutic group: A02BX, Other drugs for peptic ulcer and gastro-oesophageal reflux disease.
The medicinal product is a combination of two antacids (calcium carbonate and sodium bicarbonate) and an alginate.
On ingestion, the medicinal product reacts rapidly with gastric acid to form a protective barrier (raft) of alginic acid gel having a near neutral pH and which floats on the stomach contents. Effective impediment of gastro-oesophageal reflux may last for up to 4 hours. In severe cases the raft itself may be refluxed into the oesophagus, in preference to the stomach contents, and exert a demulcent effect.
Calcium carbonate neutralises gastric acid to provide fast relief from indigestion and heartburn. This effect is increased by the addition of sodium bicarbonate which also has a neutralising action. The total neutralising capacity of the product at the lowest dose of two tablets is approximately 10 mEqH+.
The mode of action of the medicinal product is physical and does not depend on absorption into the systemic circulation.
No pre-clinical findings of any relevance to the prescriber have been reported.
Carmoisine Lake (E122)
Xylitol DC (contains carmellose sodium)
Polypropylene container: Use within 3 months of opening.
Blister trays: Do not store above 30°C. Store in the original package to protect from moisture.
Flip-top lid containers: Do not store above 25°C. Store in the original package to protect from moisture.
Unprinted, glass, clear, thermoformable laminate of uPVC/PE/PVdC with aluminium foil lidding blisters packed into cartons.
Blister tray containing 2, 4, 6 or 8 sealed tablets. Pack sizes: 4, 6, 8, 16, 24, 32, 48, 60, 62, 64 and 80 chewable tablets.
Coloured, opaque, injection-moulded, polypropylene flip-top lid containers containing 8, 10, 12 or 16 tablets.
Not all pack sizes may be marketed.
No special instructions.
Reckitt Benckiser Healthcare (UK) Limited,
Hull, HU8 7DS,
RB Consumer Relations, PO Box 4644, SLOUGH, SL1 0NS, UK
0333 2005 345
0333 2005 345
0333 2005 345