Eno calcium tablets

ENO Calcium Antacid tablets

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ENO Calcium Antacid tablets

Round white tablets with TUMS embossing. Each tablet contains Calcium Carbonate USP 500mg.


It is effective for the symptomatic treatment of conditions relating to stomach acidity including:

  • Heartburn (pyrosis)
  • Sour stomach
  • Acid indigestion
  • Upset stomach due to these symptoms
Eno calcium tablets

Dosage and administration

Adults and children ages 12 and over: chew and swallow 2-4 tablets as symptoms occur, or as directed by a doctor

Maximum daily dose: 16 tablets (8.0g CaCO3)

During pregnancy: chew and swallow 2-4 tablets as symptoms occur, or as directed by the doctor

Maximum daily dose in pregnancy: 10 tablets (5.0g CaCO3)

Do not take for symptoms that persists for more than 2 weeks, unless advised by a doctor. Antacid maximum daily dose is equivalent to 8g calcium carbonate (3.2g elemental calcium) for adults and children ages 12 and over; 5.0g calcium carbonate (2.0g elemental calcium) for pregnant women


Do not use if you have ever had an allergic reaction to calcium carbonate or to any other of the ingredients

Contraindicated in patients with high blood calcium levels, excessive urinary calcium excretion, calcium deposits in the kidneys, kidney stones or on a low-phosphate diet


Calcium salts of this type are known to decrease the absorption of concomitantly administered drugs, such as bisphosphonates, tetracyclines and ciprofloxacin due to absorption or delaying of gastric emptying or alkalinisation of gastric juice. This can be avoided by giving other drugs 2-4 hours before or after the administration of calcium carbonate on the advice of a doctor


Always read the label of concomitant medication prior to use as some medications may contraindicate the use of calcium based antacids

The risk of hypercalcaemia should be considered in patients taking thiazide diuretics (water tablets) since these drugs can reduce the amount of calcium excreted by your body

Warnings and precautions
  • Prolonged use of higher than recommended doses may result in hypercalcaemia and milk alkali syndrome, particularly in patients with kidney problems
  • If symptoms persist for more than 2 weeks, or if symptoms worsen, medical advice must be sought.
  • Keep out of the reach of children

Pregnancy and lactation

The maximum daily dose of calcium carbonate as an antacid in pregnancy is 5.0g calcium carbonate. Calcium carbonate is unlikely to present a risk to pregnant or breastfeeding women at recommended doses. If you are pregnant do not take more than 10 tablets per day.

Ability to drive or operate machinery

This product is unlikely to affect the ability to drive or use machines

Adverse reactions

Constipation, flatulence, nausea, belching


Overdose of calcium can lead to hypercalcaemia. Symptoms of hypercalcaemia may include anorexia, thirst, nausea, vomiting, constipation, abdominal pain, muscle weakness, fatigue, mental disturbances, polydipsia, polyuria, bone pain, nephrocalcinosis, nephrolithiasis and in severe cases, cardiac arrhythmias. Extreme hypercalcaemia may result in coma and death.

If symptoms persist, seek medical advice

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