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Gaviscon is an over-the-counter medication brand primarily used to treat symptoms of gastroesophageal reflux disease (GERD), heartburn, and indigestion.

Last Modified: 13 May 2024

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What is Gaviscon? 

Gaviscon is an over-the-counter medication brand primarily used to treat symptoms of gastroesophageal reflux disease (GERD), heartburn, and indigestion. It contains a combination of alginic acid and antacids such as sodium bicarbonate and calcium carbonate. 

The drug works by forming a protective barrier on top of the stomach contents to prevent stomach acids from rising to the esophagus, which can  cause  the burning sensation known as heartburn. The antacid component also neutralizes the excess stomach acids to provide additional relief. 

Global Name

Generic name: Gaviscon 
Brand name: Gaviscon Original, Gaviscon Double Action, and Gaviscon Advance, among others.


What is Gaviscon used for? 

Gaviscon is used to alleviate symptoms associated with: 

  • Heartburn 
  • Acid reflux or GERD 
  • Indigestion (dyspepsia) 

How do you use Gaviscon? 


Gaviscon is available in several forms, including chewable tablets, liquid sachets, and liquid suspension. 

Dosage information: 

  • Adults and children over 12 years: 2-4 tablets chewed thoroughly, or 10-20 mL liquid taken after meals and at bedtime, or as directed by a doctor. 
  • Children under 12 years: Only on medical advice. 


  • Children: Consult a doctor. 
  • Adults: Suitable for use following dosage guidelines. 
  • Elderlies: Suitable for use following dosage guidelines, with caution in those with decreased renal function. 
  • Pregnancy and lactation: Generally considered safe, however, please use under medical advice. 
  • Warnings and precautions: If symptoms persist, consult a healthcare provider. Not recommended for individuals with severely compromised renal function. 

Take Gaviscon after meals and at bedtime, or as directed by a healthcare professional. 
Interactions and contraindications: 

Gaviscon can interact with certain medications, such as tetracyclines and digoxin, by affecting their absorption. It is contraindicated in individuals with hypersensitivity/allergy to any components of the formulation. 

Side Effects

Side effects are rare but may include gastrointestinal discomfort and changes in electrolyte levels. 

Pharmacist Tips

Proper Usage: 
  • Take Gaviscon as directed on the label or by your pharmacist. It is usually taken after meals and at bedtime. 
  • Chew the tablets thoroughly before swallowing for maximum effectiveness. 
  • If you are using the liquid form, shake the bottle well before each use to ensure proper mixing of the medication. 
  • Use the dosing cup provided with the liquid form to ensure you are taking the correct amount. 

Timing is Key: 

  • Timing is important with Gaviscon. Do not take it at the same time as other medications, as it can interfere with their absorption. A general rule is to wait at least 2 hours between taking Gaviscon and other medications. 

Dietary Considerations: 

  • Avoid foods and drinks that trigger heartburn, such as spicy foods, acidic fruits, caffeine, and alcohol. 
  • Eat smaller, more frequent meals instead of large meals to help reduce the pressure on your stomach. 

Avoid Overuse: 

  • Do not use Gaviscon for longer than two weeks without seeking medical advice. If symptoms persist, consult your doctor as it may indicate a more serious condition. 


  • Be aware of any allergic reactions, such as rashes, itching, or difficulty breathing. If these occur, stop taking Gaviscon and seek medical attention immediately. 
  • If you experience any new or worsening symptoms, talk to your healthcare provider.
  • Store Gaviscon at room temperature away from moisture and heat. Do not freeze the liquid form of the medication. 
  • Keep the medication out of reach of children and pets. 


  • Dispose of any expired or unused medication safely. Your pharmacist can provide information on medication take-back programs. 


Where is Gaviscon available in Hong Kong?

Gaviscon is an over-the-counter (OTC) medication that can be sold without a prescription. It is found in all chain drug stores, including Mannings and Watsons.


Is Gaviscon for purchase over-the-counter?

Yes, Gaviscon is available over-the-counter without a prescription.

Can I take Gaviscon with other medications?

Consult your healthcare provider as Gaviscon may affect the absorption of other medications. 

How quickly does Gaviscon work?

Gaviscon usually works within a few minutes of taking it, providing quick relief from heartburn and indigestion. 

How to take Gaviscon tablets? 

Gaviscon tablets should be chewed thoroughly before swallowing, followed by a glass of water, and are usually taken after meals (~30 minutes) and at bedtime, or as directed by a healthcare professional. Always refer to the product's label for specific instructions and dosing recommendations. 


This website provides content related to drug use and medicine for informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Do not use the information on this website to diagnose or treat a health problem or disease without consulting a qualified healthcare provider. The website's owners and contributors are not liable for any repercussions, adverse effects, or consequences resulting from the use of any medication or information provided herein.

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