ORIGINAL ANDREWS SALTS
Active substance(s): CITRIC ACID ANHYDROUS / MAGNESIUM SULPHATE / SODIUM HYDROGEN CARBONATE
NAME OF THE MEDICINAL PRODUCT
Original Andrews Salts
QUALITATIVE AND QUANTITATIVE COMPOSITION
Effervescent Powder containing magnesium sulphate 17.4% w/w, Sodium
Hydrogen Carbonate Ph Eur 22.6% w/w and Citric Acid (anhydrous) Ph Eur
Effervescent powder for oral use.
The product is recommended as a laxative and as an antacid for the relief of
upset stomach, indigestion and biliousness.
Posology and method of administration
Adults (including the elderly): As an antacid, measure one level spoonful (5 ml
spoonful) and take in a glass of water repeated as necessary, up to a maximum
of four times a day.
As a laxative, measure two level spoonfuls (two 5 ml spoonfuls) and take in a
glass of water before breakfast or at bedtime.
Children over 3 years: Half the adult dose.
Not suitable for children under 3 years of age.
Special warnings and precautions for use
Because of the sodium content, frequent use by patients on a low sodium diet
should be avoided. This includes patients with hypertension and cardiac or
renal dysfunction. Because of the sucrose content, diabetics should use with
caution. If a laxative is required every day, if there is persistent abdominal
pain, or if symptoms persist consult your doctor.
Interaction with other medicinal products and other forms of interaction
Magnesium sulphate, in common with other magnesium salts, may interfere
with the absorption of tetracycline and alkalinisation of the urine may modify
excretion of drugs for which the excretion is pH sensitive.
Fertility, Pregnancy and lactation
For Magnesium sulphate no clinical data on exposed pregnancies are
Animal studies do not indicate direct or indirect harmful effects with respect to
pregnancy, embryonal/foetal development, parturition or postnatal
Caution should be exercised when recommending to pregnant women.
Effects on ability to drive and use machines
No effect on mental alertness.
Diarrhoea may occur with extensive usage. Frequent or prolonged use in
patients with severe renal dysfunction may lead to hypermagnesaemia and
Diarrhoea may occur with excessive usage.
hypocalcaemia may also occur in the presence of impaired renal function.
Treatment is symptomatic and supportive.
Sodium hydrogen carbonate exerts an immediate antacid effect in the stomach
by neutralising acid secretion with the liberation of carbon dioxide.
Citric acid and sodium hydrogen carbonate in solution have a buffering
capacity which alleviates discomfort caused by acidity in the stomach.
Magnesium sulphate is not readily absorbed from the intestine and acts as a
saline purgative. Magnesium ions in the gut have also been shown to cause
secretion of cholecystokinin which favours intraluminal accumulation of water
The product has a local gastrointestinal action and so detailed pharmacokinetic
data are not available. It has been shown that less than 10% of ionic
magnesium is absorbed when the product was given to healthy subjects. The
magnesium that is absorbed is excreted by the kidney.
After absorption, the hydrogen carbonate is retained by the kidney to meet any
deficit of hydrogen carbonate in the plasma.
Citric acid is absorbed by the gastrointestinal tract and is oxidised in the body
to carbon dioxide and water.
Preclinical safety data
There are no preclinical data of relevance to the prescriber which is additional
to that already included in other sections of the SmPC.
List of excipients
Sucrose Ph Eur.
Five years (tin and laminate sachets).
Three years (plastic containers).
Special precautions for storage
Store below 25°C and away from strong odours.
Nature and contents of container
Tin with tamper evident paper seal and pressfit lid containing 110 g, 113 g,
200 g or 227 g.
4 or 8 laminate sachets containing 5 g packed into cardboard cartons.
White oval plastic containers sealed with aluminium foil and fitted with a blue
plastic overcap with hinged lid containing 150 g or 250 g.
Special precautions for disposal
Use within 3 months of opening (plastic container only).
MARKETING AUTHORISATION HOLDER
GlaxoSmithKline Consumer Healthcare (UK) Trading Limited
980 Great West Road
MARKETING AUTHORISATION NUMBER(S)
DATE OF FIRST AUTHORISATION/RENEWAL OF THE
30 January 1990 / 28 November 1996
DATE OF REVISION OF THE TEXT