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Gaviscon Double Action Liquid Sachets

Gaviscon Double Action Liquid Sachets

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  • ✔️ Dual-action formula neutralises acid and prevents reflux
  • ✔️ Fast-acting relief from heartburn after meals
  • ✔️ Convenient pre-measured sachets for on-the-go use
  • ✔️ Suitable for adults and children aged 12 and over
  • ✔️ Effective for both heartburn and indigestion symptoms

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What Are Gaviscon Double Action Liquid Sachets?

 

If you've ever felt that burning sensation creeping up your chest after a meal, you'll know just how uncomfortable heartburn can be. Gaviscon Double Action Liquid Sachets are a well-established, over-the-counter remedy designed to tackle both heartburn and indigestion at the same time — which is exactly what makes them so useful. Each sachet contains a ready-to-use liquid suspension that you can take directly after meals or at bedtime, without needing water. You can browse our full range of indigestion treatments if you'd like to compare your options.

Heartburn is extremely common in the UK. It occurs when stomach acid flows back up into the oesophagus, causing that familiar burning discomfort. Gaviscon Double Action Liquid Sachets are licensed for use in adults and children aged 12 and over, and they're available without a prescription.

 

How Do Gaviscon Double Action Liquid Sachets Work?

 

The "double action" in the name isn't just marketing — it genuinely describes two distinct mechanisms happening at once. Here's how the product works step by step:

  • Raft formation: Sodium alginate reacts with stomach acid to form a thick, viscous gel that floats on top of the stomach contents, acting as a physical barrier against acid reflux.
  • Acid neutralisation: Sodium bicarbonate and calcium carbonate work together to neutralise excess stomach acid, reducing the burning sensation directly.
  • Symptom relief: The combined effect means you get both mechanical protection and chemical neutralisation — addressing the root cause of discomfort rather than just masking it.
  • Onset of action: Relief typically begins within a few minutes of taking the dose, making it suitable for on-the-spot use after meals.

This dual approach sets it apart from simple antacids, which only neutralise acid without forming a protective raft.

 

Who Should Use Gaviscon Double Action Liquid Sachets?

 

These sachets are suitable for a wide range of people dealing with common upper gastrointestinal symptoms. They're particularly convenient for those who want a portable, pre-measured dose they can carry in a bag or pocket. That said, they're not appropriate for everyone — always read the label carefully.

  • Adults and children aged 12 years and over experiencing heartburn or acid reflux
  • People with indigestion after eating, particularly after large or rich meals
  • Pregnant women suffering from heartburn (after seeking advice from a midwife or GP)
  • Those who prefer a liquid formulation over tablets

 

How Do Gaviscon Double Action Liquid Sachets Compare to Gaviscon Advance?

 

Feature Gaviscon Double Action Liquid Sachets Gaviscon Advance Liquid
Active ingredients Sodium alginate, sodium bicarbonate, calcium carbonate Sodium alginate, potassium bicarbonate
Mechanism Raft formation + acid neutralisation Raft formation only
Suitable for pregnancy Seek advice first Often preferred in pregnancy (lower sodium)
Format Individual liquid sachets Bottle (liquid)

 

Is This Product Suitable for People With Dietary Restrictions?

 

Gaviscon Double Action Liquid Sachets contain sodium, so if you're on a low-sodium diet — for example, due to high blood pressure or kidney disease — you should speak to your GP or pharmacist before use. Each sachet contains a measurable amount of sodium, and regular use could contribute to your daily intake. It's also worth noting that Gaviscon Double Action Liquid Sachets are not suitable for children under 12 years of age unless directed by a doctor. If you're managing other digestive conditions alongside heartburn, our IBS and cramps collection may also be of interest.

This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Gaviscon Double Action Liquid Sachets specifications
Treatment category Heartburn & Indigestion
Mechanism of action Alginate raft formation and antacid neutralisation
Effective for Heartburn, acid reflux, indigestion
Suitable for Adults and children aged 12 and over
Active ingredients Sodium alginate, sodium bicarbonate, calcium carbonate
Pack sizes 12 sachets
UK classification General Sale List (GSL)
Drug class Alginate antacid
Preparation Oral liquid suspension (sachet)
Route of administration Oral

Specifications of Gaviscon Double Action Liquid Sachets

 

What Are Gaviscon Double Action Liquid Sachets and What Are They Used For?

 

Gaviscon Double Action Liquid Sachets are an over-the-counter medicine used to relieve the symptoms of heartburn, acid reflux, and indigestion. They contain three active ingredients — sodium alginate, sodium bicarbonate, and calcium carbonate — which work together to neutralise stomach acid and form a protective barrier in the stomach. The NHS recognises heartburn as a very common condition, often triggered by eating certain foods, lying down after meals, or being overweight.

These sachets are licensed for use in adults and children aged 12 and over. They are not a treatment for the underlying cause of acid reflux, such as gastro-oesophageal reflux disease (GORD), but they provide effective short-term symptom relief.

 

What Do You Need to Know Before Using Gaviscon Double Action Liquid Sachets?

 

Before taking these sachets, it's important to check whether they are appropriate for you. Do not use this product if any of the following apply:

  • You are allergic to sodium alginate, sodium bicarbonate, calcium carbonate, or any other ingredient in the product
  • You are under 12 years of age (unless directed by a doctor)
  • You have been told to follow a low-sodium or low-calcium diet
  • You have severe kidney disease
  • You have hypercalcaemia (high calcium levels in the blood)
  • You have nephrolithiasis (kidney stones containing calcium)

Speak to your GP or pharmacist before use if you are pregnant, breastfeeding, or have any other medical condition. The following medicines may interact with Gaviscon Double Action Liquid Sachets:

  • Tetracycline antibiotics (e.g. doxycycline) — absorption may be reduced
  • Thyroid medications (e.g. levothyroxine) — leave a 2-hour gap
  • Iron supplements — absorption may be affected
  • Some antifungals (e.g. ketoconazole) — take at least 2 hours apart

 

How Should You Use Gaviscon Double Action Liquid Sachets?

 

Always use this medicine exactly as described in the patient information leaflet or as directed by your pharmacist. Here's a step-by-step guide:

  1. Tear open the sachet along the notch at the top
  2. Swallow the contents directly from the sachet, or mix with a small amount of water if preferred
  3. Take after meals and at bedtime
  4. Do not take more than 4 doses (sachets) in any 24-hour period
  5. If symptoms persist beyond 7 days, consult your GP
Indication Age Group Dose Frequency
Heartburn / indigestion Adults & children 12+ 2–4 sachets (10–20 ml) After meals and at bedtime, up to 4 times daily
Heartburn in pregnancy Adults (seek advice first) 2–4 sachets After meals and at bedtime, as directed by GP
Children under 12 Under 12 years Not recommended without medical supervision

 

What Are the Possible Side Effects of Gaviscon Double Action Liquid Sachets?

 

Like all medicines, Gaviscon Double Action Liquid Sachets can cause side effects, although not everyone experiences them. Most people tolerate this product well when used as directed.

Common side effects (may affect up to 1 in 10 people):

  • Nausea
  • Vomiting
  • Constipation
  • Flatulence (wind)

Less common side effects (may affect up to 1 in 100 people):

  • Allergic reactions such as skin rash, itching, or urticaria
  • Swelling of the face, lips, tongue, or throat (angioedema) — seek immediate medical attention if this occurs
  • Raised blood calcium levels with prolonged high-dose use

If you experience any serious or unexpected side effects, stop taking the product and contact your GP or pharmacist. You can also report side effects directly to the MHRA via the Yellow Card scheme. If you're managing other digestive symptoms alongside heartburn, you might find our sickness and nausea range helpful.

 

How Should You Store Gaviscon Double Action Liquid Sachets?

 

Correct storage helps maintain the product's effectiveness and safety. Follow these guidelines:

  • Store below 30°C in a dry place
  • Do not freeze
  • Keep out of the sight and reach of children
  • Do not use after the expiry date printed on the sachet or outer carton
  • Once opened, use the sachet immediately — do not store a partially used sachet
  • Dispose of unused medicines responsibly — return to your local pharmacy for safe disposal

For general digestive wellness, it's also worth considering whether your diet and lifestyle may be contributing to symptoms. The NHS provides detailed guidance on managing heartburn through lifestyle changes, which can complement the use of medicines like these sachets. You may also want to explore our vitamins and supplements range to support your overall digestive health.

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Frequently Asked Questions

Where can I buy Gaviscon Double Action Liquid Sachets online in the UK?

You can buy Gaviscon Double Action Liquid Sachets online from Cured Pharmacy, a GPhC-registered UK online pharmacy. They are available without a prescription as a General Sale List (GSL) medicine. Simply add them to your basket and choose your preferred delivery option for fast, discreet dispatch.

How do Gaviscon Double Action Liquid Sachets work in the body?

The sachets work through two simultaneous mechanisms. Sodium alginate reacts with stomach acid to form a thick gel raft that floats on top of stomach contents, physically preventing acid from refluxing into the oesophagus. At the same time, sodium bicarbonate and calcium carbonate neutralise excess stomach acid, reducing the burning sensation associated with heartburn and indigestion.

How do I use Gaviscon Double Action Liquid Sachets step by step?

Using the sachets is straightforward. Follow these steps:

  1. Tear open the sachet at the notch
  2. Swallow the liquid contents directly, or mix with a little water
  3. Take after meals and at bedtime
  4. Do not exceed 4 sachets in 24 hours

No preparation is needed — the sachets are ready to use straight from the pack, making them ideal for use on the go.

What is the correct dose of Gaviscon Double Action Liquid Sachets for adults?

Adults and children aged 12 and over should take 2 to 4 sachets (equivalent to 10–20 ml) up to four times daily. Doses should be taken after meals and at bedtime. Do not exceed 4 doses in any 24-hour period unless directed by a doctor.

Can I take Gaviscon Double Action Liquid Sachets during pregnancy?

Gaviscon products are commonly used during pregnancy for heartburn relief, and the NHS acknowledges antacids as a first-line option for pregnant women. However, because these sachets contain sodium, your midwife or GP may recommend Gaviscon Advance instead, which has a lower sodium content. Always seek professional advice before taking any medicine during pregnancy.

What are the side effects of Gaviscon Double Action Liquid Sachets?

Most people tolerate Gaviscon Double Action Liquid Sachets well. Possible side effects include nausea, vomiting, constipation, and flatulence. Rarely, allergic reactions such as skin rash or swelling of the face and throat may occur — if this happens, stop use immediately and seek urgent medical attention.

Can Gaviscon Double Action Liquid Sachets interact with other medicines?

Yes, Gaviscon can affect the absorption of certain medicines, including tetracycline antibiotics, levothyroxine, iron supplements, and some antifungals. To avoid this, leave at least a 2-hour gap between taking Gaviscon and any other medicines. If you're unsure, speak to your pharmacist before use.

How long can you use Gaviscon Double Action Liquid Sachets for?

These sachets are intended for short-term use only. If your symptoms persist for more than 7 days, worsen, or are accompanied by difficulty swallowing, unexplained weight loss, or vomiting blood, you should stop use and consult your GP promptly. Persistent heartburn may indicate an underlying condition such as GORD that requires further investigation.

Are Gaviscon Double Action Liquid Sachets suitable for children?

Gaviscon Double Action Liquid Sachets are not recommended for children under 12 years of age unless specifically directed by a doctor. For younger children with reflux symptoms, a GP should be consulted to identify the most appropriate treatment. Parents looking for children's digestive or general health products can explore our baby and toddler range for age-appropriate options.

What is the difference between Gaviscon Double Action and Gaviscon Advance?

Gaviscon Double Action contains sodium alginate, sodium bicarbonate, and calcium carbonate — providing both raft formation and acid neutralisation. Gaviscon Advance contains sodium alginate and potassium bicarbonate, forming a raft but with less acid-neutralising action and a lower sodium content. Gaviscon Advance is often preferred during pregnancy or for those on a low-sodium diet.

What are the alternatives to Gaviscon Double Action Liquid Sachets?

Alternatives include other alginate-based products such as Gaviscon Advance, as well as simple antacids like Rennie or Tums. For more persistent symptoms, a GP may recommend a proton pump inhibitor (PPI) such as omeprazole. You can browse our full indigestion treatments collection to compare available options.

What happens if I miss a dose of Gaviscon Double Action Liquid Sachets?

Gaviscon Double Action Liquid Sachets are taken as needed for symptom relief rather than on a strict dosing schedule, so missing a dose is not a concern in the same way as with regular prescription medicines. Simply take a sachet when symptoms occur, after meals or at bedtime. Never double up doses to compensate for a missed one.

Can I take Gaviscon Double Action Liquid Sachets on an empty stomach?

Gaviscon Double Action Liquid Sachets are most effective when taken after meals and at bedtime, as this is when the alginate raft can form most effectively on top of stomach contents. Taking them on an empty stomach is less likely to provide optimal relief, as there is less gastric content for the raft to sit on. For best results, always take after eating.

Is there any latest research on alginate-based heartburn treatments like Gaviscon?

Alginate-based therapies have been studied extensively and are well-supported by clinical evidence as an effective first-line treatment for mild to moderate heartburn and acid reflux. Research published in peer-reviewed journals has confirmed that alginate rafts can significantly reduce oesophageal acid exposure compared to placebo. The NHS and NICE both recognise alginates as appropriate options for managing heartburn symptoms.

Can I take Gaviscon Double Action Liquid Sachets with other heartburn medicines?

You should not routinely combine Gaviscon with other antacids without speaking to a pharmacist first, as this could lead to excessive intake of certain minerals such as calcium or sodium. If you are already taking a PPI (e.g. omeprazole) prescribed by your GP, Gaviscon can sometimes be used alongside it for breakthrough symptoms — but always confirm this with your pharmacist or doctor before doing so.

How Should You Use Gaviscon Double Action Liquid Sachets?

Using Gaviscon Double Action Liquid Sachets correctly ensures you get the most effective relief from heartburn and indigestion. Each sachet contains a pre-measured dose of liquid suspension that is ready to use without any preparation.

Follow these steps each time you take a dose:

What Is the Correct Dose of Gaviscon Double Action Liquid Sachets?

Always follow the dosage instructions on the patient information leaflet or as directed by your pharmacist. Taking more than the recommended dose will not improve your symptoms and may increase the risk of side effects.

When Is the Best Time to Use Gaviscon Double Action Liquid Sachets?

The optimal time to take Gaviscon Double Action Liquid Sachets is after meals and at bedtime. Taking the sachets after eating means the alginate raft can form effectively on top of stomach contents, providing the best possible barrier against acid reflux. Taking a dose at bedtime is particularly useful if you experience night-time heartburn or symptoms that worsen when lying down.

Avoid taking the sachets on a completely empty stomach where possible, as this reduces the effectiveness of the raft-forming mechanism. If you experience symptoms between meals, a dose can still be taken, but post-meal timing is preferred for maximum benefit.

How Long Can You Use Gaviscon Double Action Liquid Sachets For?

Gaviscon Double Action Liquid Sachets are designed for short-term use to manage occasional heartburn and indigestion. If your symptoms have not improved after 7 days of regular use, or if they worsen at any point, you should stop taking the sachets and consult your GP. Persistent or severe symptoms may indicate an underlying condition such as gastro-oesophageal reflux disease (GORD) or a peptic ulcer, which requires proper medical assessment and treatment.

Long-term, unsupervised use is not recommended. Your GP can advise on whether a longer course of treatment or a different medicine — such as a proton pump inhibitor — is more appropriate for your situation.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

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What Are the Most Common Side Effects of Gaviscon Double Action Liquid Sachets?

Gaviscon Double Action Liquid Sachets are generally well tolerated when used as directed. However, like all medicines, they can cause side effects in some people. Common side effects are usually mild and tend to resolve on their own without the need for medical treatment.

  • Nausea
  • Vomiting
  • Constipation
  • Flatulence (wind or bloating)

What Are the Less Common Side Effects of Gaviscon Double Action Liquid Sachets?

Less common side effects occur in a small number of people and are more likely with prolonged use or if the recommended dose is exceeded. If you notice any of the following, speak to your pharmacist or GP.

  • Skin rash or itching (urticaria)
  • Raised blood calcium levels (hypercalcaemia) — particularly with long-term high-dose use
  • Increased thirst or frequent urination (possible signs of hypercalcaemia)
  • Stomach discomfort or cramping

What Are the Serious Side Effects of Gaviscon Double Action Liquid Sachets?

Serious side effects are rare but require immediate medical attention if they occur. Stop taking the sachets straight away and call 999 or go to your nearest A&E if you experience any of the following:

  • Swelling of the face, lips, tongue, or throat (angioedema)
  • Difficulty breathing or swallowing
  • Severe allergic reaction (anaphylaxis) — characterised by sudden onset of rash, breathlessness, and collapse

These reactions are very uncommon, but it's important to be aware of them. If you have a known allergy to any of the ingredients, do not use this product.

What Should You Do If You Experience Side Effects of Gaviscon Double Action Liquid Sachets?

If you experience mild side effects such as nausea or constipation, these often improve as your body adjusts. Staying well hydrated and maintaining a balanced diet can help manage constipation. If side effects are persistent or troublesome, stop use and speak to your pharmacist — they can advise on whether to continue or switch to an alternative product.

You can also report suspected side effects directly to the Medicines and Healthcare products Regulatory Agency (MHRA) via the Yellow Card scheme at yellowcard.mhra.gov.uk. Reporting side effects helps improve the safety information available for all medicines.

Can Gaviscon Double Action Liquid Sachets Interact With Other Medicines?

Yes. Because Gaviscon Double Action Liquid Sachets contain calcium carbonate and sodium bicarbonate, they can affect the absorption of certain other medicines if taken at the same time. This is particularly relevant for tetracycline antibiotics (such as doxycycline), levothyroxine (thyroid medication), iron supplements, and some antifungal medicines such as ketoconazole. To minimise the risk of interactions, always leave at least a 2-hour gap between taking Gaviscon and any other medicines. If you are taking multiple medicines regularly, speak to your pharmacist before starting Gaviscon Double Action Liquid Sachets.

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

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