Medicines & Supplements A to Z > Calcium Carbonate

Calcium Carbonate

Last updated on July 3, 2019.

Overview   |   Dosage   |   Side Effects   |   Where To Buy  

GENERIC NAME: Calcium Carbonate


COMMON BRANDS IN HONG KONG: Gaviscon 嘉胃斯康 (contains Calcium Carbonate, Sodium Alginate, Sodium Bicarbonate), Megagel (contains Calcium Carbonate and Simethicone

What is Calcium Carbonate for?

Calcium Carbonate is commonly used as a dietary supplement for those who with low calcium level and in calcium deficiency states. Calcium is important for the development of healthy bones. It is sometimes combined with Vitamin D. Calcium Carbonate can also be used to treat indigestion and heartburn. It can neutralise the stomach acid due to its alkaline property.

How to use it?

Calcium Carbonate can be taken by mouth in many forms, like tablets, suspensions, and sachets. If you are using it for low calcium levels or calcium deficiency states, you should take 0.5-4 g daily in 1-3 divided doses. If you are using it for indigestion or heartburn, you should take 0.5-3 g as soon as symptoms appear. The maximum daily dose is 7.5 g for up to 2 weeks. The doses vary between different products so you are advised to check with your doctor, pharmacist, or the product label. 

What are the side effects of Calcium Carbonate?

Common side effects of Calcium Carbonate include constipation, flatulence and burping.

Where to buy Calcium Carbonate in Hong Kong?

In Hong Kong, Calcium Carbonate is an over-the-counter medicine and can be purchased without a prescription from any retail outlet in Hong Kong. This includes grocery stores, convenience stores, medicine shops, and pharmacies. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health. 

For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at

For detailed information about the use of Calcium Carbonate in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.

Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.