Medicines & Supplements A to Z > Gaviscon


Last updated on 16/07/2021.

Overview   |   Dosage   |    Side Effects   |   Precautions  |   Tips  |   Where To Buy  

GENERIC NAME: Sodium alginate + Potassium bicarbonate + Calcium carbonate + Sodium bicarbonate


DRUG CLASS: Gastrointestinal Drugs

SUB CLASS: Antacid

USED FOR: Gastroesophageal reflux disease, Heartburn

– (chewable tablets)
– (suspension)
– (sachets)

What is Gaviscon for?

Gaviscon is a combination therapy of Sodium alginate and/or Potassium bicarbonate and/or Calcium carbonate and/or Sodium bicarbonate. Potassium bicarbonate/Calcium carbonate/Sodium bicarbonate can reduce the acidity of gastric content and relieve heartburn, whereas Sodium alginate forms a gel with gastric acid to protect the stomach from excessive acid. Different Gaviscon regimens may have different combinations of active ingredients, but they are all suitable for relieving gastroesophageal reflux disease (GERD) and heartburn.

How to use it?

Gaviscon is available in liquid, suspension, sachet and chewable tablets for oral use. 

administer 10-20 ml up to 4 times a day.

Chewable tablets:
take 2-4 tablets up to 4 times a day.

use 1-2 sachets up to 4 times a day.

What are the side effects of Gaviscon?

Common side effects of Gaviscon include nausea and vomiting.

Who should not take Gaviscon?

Patients who are allergic to any component in the formulation.

Pharmacist Tips:

– Gaviscon is used only as a symptomatic relief medication for heartburn. If symptoms persist, seek medical attention immediately.
– If pain radiates to the back, left upper arm or neck, please seek  medical attention immediately.
– Although this medication is not contra-indicated for pregnant women, it is advised to avoid administration of self-purchased drugs.

Common dosing schedule:
Gaviscon should be taken as required after meals and before going to bed.

This schedule is for reference only, adjustments may be made according to individual needs.

Some common medications Gaviscon may interact with:
– Calcium channel blockers, e.g. Verapamil, Diltiazem
– Bisphosphonates, e.g. Alendronate, Risedronate
– Antibiotics, e.g. Doxycycline, Ciprofloxacin
– Multivitamins and supplements

Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.

Where to buy Gaviscon in Hong Kong?

In Hong Kong, Gaviscon 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

Need more information?

For detailed information about the use of Gaviscon 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.