Antacid
Last reviewed July 2026
Who is this for?
Calcium Carbonate and Magnesium Carbonate is an antacid combination that works by neutralizing excess acid in your stomach, giving you quick relief from heartburn and indigestion.
Neutralizes gastric acid by reacting with hydrochloric acid in the stomach to form soluble salts, raising gastric pH and reducing acid-mediated irritation of the gastric mucosa. Increases lower esophageal sphincter pressure, reducing gastroesophageal reflux and providing symptomatic relief of heartburn and indigestion.
Heartburn, stomach acid, indigestion, sour stomach, bloating from excess gas, stomach upset after eating spicy or heavy food
Available Over The Counter
Get this from any pharmacy or chemist: no prescription needed.
Explore this drug
This medicine is taken only when you feel symptoms like heartburn or stomach acid, so there is no regular schedule. Simply take it when you need it, no need to worry about a missed dose.
Do not use antacids as a long-term solution, as if your stomach problem lasts more than 2 weeks, see a doctor as it could be something more serious like an ulcer. Buy from a reputable pharmacy to ensure you are getting genuine Rennie and not a fake product. Do not exceed the recommended daily dose even if symptoms persist.
It can reduce the effectiveness of some antibiotics like tetracycline and ciprofloxacin, so take them at least 2 hours apart. It can also interfere with iron tablets and some blood pressure medicines. If you are on any regular medication, take your antacid at least 2 hours before or after.
Check your specific combination
Is it safe to take Calcium with your other drugs?
Generally considered safe in normal doses during pregnancy and breastfeeding, but consult your doctor or pharmacist before using it regularly.
Store in a cool, dry place away from direct sunlight and heat. Nigerian weather can be hot and humid, so avoid keeping it near windows or in your car. Always keep out of reach of children.
For information only: not medical advice. Always talk to a doctor or pharmacist before changing your medication.
Names this drug is sold under, especially in Nigerian and West African pharmacies
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Counterfeit Drug Warning
Fake drugs are a serious problem in Nigeria. Always buy from a registered pharmacy. If the packaging looks different from what is described above, do not use it.