What is the use of Gaviscon syrup? A complete guide to its purpose and function

October 11, 2025 •

4 min read

According to studies, heartburn and acid reflux are highly prevalent, with up to 28% of the population in Western countries experiencing symptoms at least once a week. For many, the answer lies in understanding the function of specific treatments, like the purpose behind the question, 'What is the use of Gaviscon syrup?'. This liquid medication provides targeted relief by creating a unique protective barrier against stomach acid.

Quick Summary

Gaviscon syrup is used to treat heartburn, acid reflux, and indigestion by neutralizing stomach acid and forming a physical barrier to block rising stomach contents. Its unique dual-action formula provides fast and long-lasting relief for various digestive discomforts.

Key Points

Heartburn and Indigestion Relief: Gaviscon syrup is used to treat heartburn (acid reflux) and indigestion by neutralizing stomach acid and providing symptomatic relief.
Dual-Action Mechanism: It works in two ways: first, by neutralizing stomach acid with antacids, and second, by forming a gel-like 'raft' that acts as a physical barrier to prevent acid from rising into the esophagus.
Effective for Acid Reflux: The alginate raft makes Gaviscon especially effective for managing acid reflux and GERD, particularly after meals.
Dosage and Timing: For optimal results, Gaviscon syrup is typically taken after meals and at bedtime, and it should be shaken well before use.
Safe for Pregnancy (Specific Formulations): Certain low-sodium versions, such as Gaviscon Advance, are considered safe for pregnant and breastfeeding women, though medical advice is always recommended.
Infant-Specific Product: There is a special Gaviscon Infant powder designed for babies and young children with reflux, used under medical supervision.
Potential Drug Interactions: Gaviscon can interfere with the absorption of other medications, so separating doses by at least two hours is advised.

What Is Gaviscon Syrup and How Does It Work?

Gaviscon syrup is an over-the-counter medication designed to combat the symptoms of acid reflux and indigestion. It provides a fast-acting solution that offers both immediate acid-neutralizing relief and sustained protection through a unique physical barrier. This dual-action mechanism is what sets it apart from traditional antacids.

The syrup's primary active ingredients include sodium alginate and antacids such as aluminum hydroxide and magnesium carbonate. When Gaviscon is ingested, the sodium alginate reacts with stomach acid to form a thick, gel-like foam, often referred to as a 'raft'. This raft floats on top of the stomach's contents, effectively creating a physical barrier that prevents acidic stomach contents from rising back up into the esophagus. Simultaneously, the antacids neutralize excess stomach acid, reducing the burning sensation and discomfort associated with indigestion and sour stomach.

The Dual-Action Mechanism of Gaviscon

Alginate Raft Formation: The core of Gaviscon's effectiveness is its sodium alginate content, which is derived from brown seaweed. Upon mixing with gastric acid, it precipitates to form a low-density, floating gel. This raft is resistant to stomach emptying and can persist for several hours, providing prolonged relief by physically blocking reflux.
Antacid Neutralization: The aluminum and magnesium-based antacids in Gaviscon work to quickly increase the pH of the stomach contents. This neutralizes the acid, providing rapid symptom relief even before the raft fully forms. This is particularly beneficial for immediate discomfort from sour stomach.

Key Uses of Gaviscon Syrup

Gaviscon syrup is primarily used for the management of upper gastrointestinal issues. Its efficacy addresses a range of symptoms, making it a versatile option for quick relief. The main uses include:

Heartburn Relief: The most common use of Gaviscon is for treating heartburn, the burning sensation in the chest caused by acid reflux. By forming a protective barrier, it soothes the irritated lining of the esophagus and prevents further acid contact.
Acid Indigestion: Gaviscon is also effective in alleviating the pain and discomfort of acid indigestion, including bloating and a feeling of fullness after eating. The antacid component helps to settle an upset stomach by neutralizing excess acid.
Sour Stomach: The medication provides temporary relief for sour stomach, a symptom often associated with acid production.
Acid Reflux and GERD: For people with chronic acid reflux (also known as gastroesophageal reflux disease or GERD), Gaviscon can help manage the symptoms by reducing esophageal acid exposure. Its raft mechanism is particularly helpful for postprandial (after-meal) reflux.

Comparison: Gaviscon vs. Traditional Antacids

Understanding how Gaviscon differs from other antacids can help you choose the right medication for your symptoms. Here is a comparison with a common calcium-based antacid like Tums.


Feature	Gaviscon (Syrup)	Traditional Antacids (e.g., Tums)
Mechanism of Action	Dual-action: Forms a physical barrier ('raft') to block reflux and neutralizes stomach acid.	Single-action: Neutralizes stomach acid.
Duration of Relief	Provides longer-lasting protection (up to 4 hours) due to the persistent raft.	Offers rapid but shorter-lived relief, typically lasting around 30 minutes to an hour.
Symptom Focus	Ideal for symptoms caused by acid reflux, where acid backs up into the esophagus.	Best for immediate relief of general heartburn and sour stomach.
Active Ingredients	Contains alginates (like sodium alginate) and antacids (aluminum hydroxide, magnesium carbonate).	Primarily contains calcium carbonate.
Reflux Prevention	Physically prevents acid from rising into the food pipe.	Does not prevent reflux, only neutralizes the acid already present.

Dosage and Administration

For adults and children over 12, Gaviscon syrup is typically taken four times a day. The syrup should be taken after meals and at bedtime to be most effective, as this allows the alginate raft to form on top of the food and protect against post-meal reflux. It is important to shake the bottle well before use and to use a measuring device to ensure the correct amount is taken. Do not exceed the maximum daily allowance and consult a doctor if symptoms persist beyond two weeks.

Special Considerations

Pregnancy and Breastfeeding: Many Gaviscon products, especially lower-sodium formulations like Gaviscon Advance, are considered safe for use during pregnancy and breastfeeding, offering much-needed relief from heartburn. Always consult a doctor or pharmacist before use, especially since some formulations contain higher sodium levels.
Infants: A special formulation, Gaviscon Infant, is available for babies and young children under medical supervision to manage symptoms of reflux and regurgitation. This comes as a powder to be mixed with feeds or water, thickening the stomach contents to prevent spilling.
Medication Interactions: Gaviscon, like other antacids, can affect the absorption of other oral medications. It is generally recommended to take Gaviscon at least two hours apart from other drugs to avoid potential interference.

Potential Side Effects and Precautions

While Gaviscon is generally well-tolerated, some side effects can occur, including mild constipation or diarrhea. Long-term or excessive use can lead to more serious issues, particularly in individuals with pre-existing conditions.

Kidney Disease: Patients with kidney disease should use Gaviscon with caution due to the aluminum and magnesium content, which can build up in the body and lead to toxicity.
Chronic Use: As with any over-the-counter medication, prolonged use can mask a more serious underlying condition. If symptoms are persistent, medical advice is essential.

Conclusion

Gaviscon syrup offers a powerful and comprehensive approach to managing the symptoms of heartburn, acid indigestion, and acid reflux. Its dual-action formula provides fast neutralization and creates a lasting physical barrier to prevent the painful sensation of acid rising into the esophagus. While it is a safe and effective treatment for many, particularly pregnant women and infants under professional guidance, it is important to follow dosage instructions and consult a healthcare provider for any persistent or serious symptoms. Understanding the unique mechanism behind its action empowers users to make informed choices for their digestive health. For more detailed information on Gaviscon, consult the NHS guidance on Gaviscon.

Frequently Asked Questions

Gaviscon syrup often provides rapid relief from heartburn and acid indigestion, with its acid-neutralizing and raft-forming action beginning to work soon after consumption.

Gaviscon is intended for short-term relief. Prolonged use should only be done under a doctor's supervision, as it could mask symptoms of a more serious condition and potentially lead to side effects, especially in individuals with kidney problems.

Gaviscon offers a dual-action benefit over traditional antacids like Tums. While both neutralize stomach acid, Gaviscon’s added alginate forms a protective barrier to physically block acid reflux, providing longer-lasting relief.

Common side effects are usually mild and may include mild constipation or diarrhea. More serious effects are rare but require immediate medical attention if experienced.

Gaviscon can affect the absorption of other medications. It is best to consult your doctor or pharmacist and take other oral medications at least two hours before or after your Gaviscon dose.

Gaviscon syrup should be stored at room temperature, away from moisture and heat. It is also important to avoid freezing the product.

Yes, for bottle-fed infants, Gaviscon Infant powder can be mixed directly into the formula milk. For breastfed infants, it should be mixed with a small amount of cooled, boiled water and given during or after a feeding.