Yes, Gaviscon can help relieve acid reflux symptoms. Unlike a plain antacid, it contains alginate, which forms a floating layer over the contents of your stomach. This can help reduce the amount of stomach contents moving back up into the oesophagus. Gaviscon also contains antacid ingredients in many formulations, which can help relieve the discomfort caused by stomach acid. NHS guidance classifies Gaviscon as a reflux suppressant rather than simply an antacid.
For adults in the UK dealing with acid reflux or GORD symptoms, it can be difficult to know whether Gaviscon, another over the counter option or prescription treatment is more suitable. This guide explains how Gaviscon works, how it compares with antacids and other reflux medicines, how Acidex and Peptac compare, what medicines you may need to take separately, how alcohol can affect reflux, how long you should use Gaviscon and when frequent symptoms need medical advice.
Key Things to Know
- Gaviscon is a reflux suppressant that forms a protective layer over the stomach contents
- Plain antacids neutralise stomach acid, while alginates form a physical barrier that can help reduce reflux
- Acidex and Peptac are medicines that work in a similar way to Gaviscon
- Alginates are available over the counter and can be useful for short term relief of reflux symptoms
- If you need Gaviscon regularly for more than 7 days, speak to a doctor rather than continuing to self treat.
Does Gaviscon Help With Acid Reflux?
Yes, Gaviscon can help relieve the symptoms of acid reflux. It is designed to form a protective layer over the stomach contents, helping to reduce stomach acid moving up into the food pipe. It also contains antacid ingredients that can help with the discomfort caused by excess stomach acid.
Clinical evidence also supports the use of alginate and antacid combinations for reflux symptoms. NICE notes that antacid and alginate combinations can be used for symptom relief, including when symptoms return after treatment.
How the Raft Works
Alginic acid is made from seaweed. When it comes into contact with stomach acid, it forms a gel. In Gaviscon products, other ingredients can produce carbon dioxide, which helps the gel float on top of the stomach contents. This creates a protective layer that can help stop stomach acid moving up into the food pipe.
This is sometimes described as a "raft". The idea is simple: instead of only neutralising acid that is already in your stomach, the alginate layer helps reduce reflux itself.
Research has also looked at how alginate formulations behave inside the stomach after a meal. Some imaging studies suggest that the raft can sit around the area where post meal reflux may begin. However, these findings do not mean that Gaviscon will prevent every episode of reflux.
Gaviscon usually starts working soon after a dose, and the effect of one dose can last for around 4 hours.
Does Gaviscon Help With GORD?
It can help relieve the symptoms of GORD (gastro oesophageal reflux disease), particularly when used for short term symptom relief.
The important distinction is between relieving symptoms and treating the underlying condition. Gaviscon can help reduce reflux and discomfort, but it is not the same as a proton pump inhibitor, which reduces the amount of acid your stomach produces.
If you have ongoing GORD, severe oesophagitis or another condition affecting your oesophagus, your doctor may recommend a different treatment plan. NICE recommends proton pump inhibitors for people with GORD, with the dose and length of treatment depending on the individual's symptoms and clinical circumstances.
Gaviscon can also be used alongside a proton pump inhibitor when appropriate. NHS guidance confirms that Gaviscon can be taken with a PPI such as lansoprazole.
Gaviscon vs Antacid: The Difference That Matters
A plain antacid, such as calcium carbonate or magnesium carbonate, works by neutralising some of the acid already in your stomach. It can provide quick relief from heartburn and indigestion, but it does not work in the same way as an alginate.
An alginate forms a protective layer over the stomach contents. Many Gaviscon products contain both an alginate and antacid ingredients, so they can work in two ways.
| Option | What it does | Onset | Roughly how long |
|---|---|---|---|
| Antacid (e.g. calcium or magnesium carbonate) | Neutralises some of the acid already present | Usually quick | A few hours |
| Alginate raft (Gaviscon, Acidex, Peptac) | Forms a protective layer over the stomach contents and may also neutralise acid | Usually quick | Around four hours for Gaviscon |
| H2 blocker (e.g. famotidine) | Reduces acid production through histamine receptors | Varies | Several hours |
| Proton pump inhibitor | Reduces the amount of acid produced by the stomach | Builds over time | Longer lasting acid suppression |
Gaviscon is usually taken after meals and at bedtime. This is different from some proton pump inhibitors, which are often taken before a meal. Always follow the instructions for your particular medicine.
Gaviscon Alternatives in the UK
There are several medicines available in the UK that work in a similar way to Gaviscon. The right option depends on your symptoms, other medicines and any health conditions you have.
Acidex vs Gaviscon, and Peptac vs Gaviscon
NHS guidance lists Acidex and Peptac as medicines that work in a similar way to Gaviscon. They are available from pharmacies and supermarkets. They are not simply different names for the same product, though. Different products can contain different amounts of their active ingredients and may have different dosing instructions.
| Product | Active ingredients per 10ml | Closest match |
|---|---|---|
| Gaviscon Original liquid | Sodium alginate 500mg, sodium bicarbonate 267mg, calcium carbonate 160mg | Gaviscon Original |
| Peptac liquid | Sodium alginate, sodium bicarbonate, calcium carbonate | Similar type of product |
| Acidex oral suspension | Sodium alginate, sodium bicarbonate, calcium carbonate | Similar type of product |
| Gaviscon Advance | Gaviscon Advance contains 1,000mg sodium alginate per 10ml and potassium bicarbonate 200mg | Higher alginate formulation |
| Acidex Advance | Sodium alginate 1000mg, potassium bicarbonate 200mg | Similar to Gaviscon Advance |
| Gaviscon Double Action | Alginate plus calcium carbonate and sodium bicarbonate antacids | Raft plus antacid |
The exact formulation can vary between products and versions, so check the label rather than assuming that two products have identical doses. For example, the current product information for Gaviscon Original confirms 500mg sodium alginate, 267mg sodium bicarbonate and 160mg calcium carbonate per 10ml.
If you are looking for a lower cost alternative, a pharmacist can help you compare suitable alginate products.
Non-Alginate Alternatives
If an alginate does not suit you, there are other types of treatment.
Plain antacids can provide quick relief for occasional heartburn. H2 blockers, such as famotidine, reduce acid production in a different way. Proton pump inhibitors, such as omeprazole and lansoprazole, reduce the amount of acid your stomach produces and are commonly used when reflux symptoms are persistent.
Which option is suitable depends on how often you have symptoms, how severe they are, your other medicines and your health history. A pharmacist or prescriber can help you choose the most appropriate option.
Gaviscon and Alcohol
There is no specific NHS warning that you cannot drink alcohol while taking Gaviscon. However, alcohol can make reflux symptoms worse for some people.
If you already know that alcohol triggers your heartburn, reducing the amount you drink may help more than simply taking Gaviscon afterwards. Large meals, fizzy drinks and eating close to bedtime can also make reflux symptoms worse for some people.
If you do drink, try to avoid lying down soon afterwards. Leaving around 3 to 4 hours between eating and going to bed can also help reduce reflux symptoms.
What to Space Gaviscon Away From
This is an important point if you take other medicines. Gaviscon can affect how some medicines are absorbed, so NHS guidance recommends leaving a 2 hour gap before or after taking Gaviscon for several medicines.
| Medicine group | Why it matters | Practical step |
|---|---|---|
| Levothyroxine | Gaviscon can affect its absorption | Leave at least a 2 hour gap before or after Gaviscon |
| Tetracycline and quinolone antibiotics | Gaviscon can affect how these medicines are absorbed | Leave at least a 2 hour gap |
| Iron tablets | Gaviscon can affect absorption | Leave at least a 2 hour gap |
| Bisphosphonates for bone health | Gaviscon can affect absorption | Leave at least a 2 hour gap |
| Other medicines | The interaction depends on the medicine | Check the leaflet or ask a pharmacist |
NHS guidance lists several other medicines that may need to be separated from Gaviscon, including some antihistamines, beta blockers, steroids and medicines used for fungal infections. The full list is longer, so check the leaflet that comes with your product if you take regular medicines.
If you take levothyroxine, antibiotics, iron tablets or medicines for osteoporosis, it is particularly important to check the timing with a pharmacist or doctor.
Who Should Be Careful With Alginates
Different Gaviscon products contain different amounts of sodium, calcium or potassium. This can matter if you have been advised to follow a low sodium or low calcium diet, or if you have kidney, liver or heart disease.
If you have been told to restrict salt or potassium, check the specific product with a pharmacist before taking it regularly. Do not assume that one Gaviscon formulation is interchangeable with another.
Adults should follow the dosing instructions for their particular product and should not exceed the recommended amount. Products for children are formulated differently, so adult products should not be used for children unless a doctor or pharmacist has advised you to do so.
How Long Should You Use It?
If you buy Gaviscon without a prescription, NHS guidance says you should not take it for longer than 7 days without checking with a doctor. If you are still uncomfortable after 7 days, speak to your doctor because you may need a different treatment or further assessment.
This does not mean Gaviscon is automatically harmful after 7 days. The point is that ongoing symptoms may need a closer look rather than continued self treatment.
If you have been taking Gaviscon regularly for a long time, talk to your doctor before stopping it. Symptoms can return after stopping regular treatment.
When Gaviscon Is the Wrong Tool
Speak to a doctor rather than continuing to self treat if you have difficulty swallowing, food getting stuck, frequent vomiting, unexplained weight loss or heartburn that is not improving with pharmacy treatment. NHS guidance also recommends medical advice if you have heartburn most days.
Seek urgent medical help if you vomit blood, have black or tarry stools, or develop severe symptoms.
Gaviscon can cause side effects such as wind and bloating, particularly if you take more than the recommended amount. If you develop signs of a serious allergic reaction, such as difficulty breathing or significant swelling, seek urgent medical help.
If you forget a dose, leave it out and take your next dose at the usual time. Do not take two doses together to make up for the missed one.
Chest pain with breathlessness, sweating or pain spreading to your arm or jaw should not be assumed to be heartburn. Seek emergency medical help.
Using Gaviscon Alongside Proton Pump Inhibitors and Other Reflux Treatments
Gaviscon can be taken alongside a proton pump inhibitor such as omeprazole or lansoprazole when appropriate. They work in different ways: Gaviscon forms a protective layer over the stomach contents, while a proton pump inhibitor reduces the amount of acid your stomach produces. NHS guidance confirms that Gaviscon can be taken with a PPI.
The timing is different. Gaviscon is usually taken after meals and at bedtime, while some PPIs are taken before a meal. Follow the instructions given for each medicine rather than taking them at the same time simply for convenience.
If you find that you need Gaviscon most days despite taking a PPI, tell your prescriber. You may need your treatment reviewed rather than simply adding more doses.
What About Drinks for Acid Reflux?
Water is generally a simple choice if you have reflux. However, drinks affect people differently, so it can be useful to notice which ones trigger your symptoms.
Coffee, fizzy drinks and alcohol can make symptoms worse for some people. Citrus drinks can also be a trigger. You do not necessarily need to avoid every drink on this list, but if you notice a clear pattern, cutting back may help.
Milk may provide temporary relief for some people, but it is not a treatment for reflux. Alkaline water is also sometimes promoted as a reflux treatment, but there is not enough good evidence to treat it as an alternative to established medicines.
Herbal drinks such as chamomile or ginger may suit some people, but they do not form the protective alginate layer that Gaviscon does. If you have frequent reflux, changing drinks alone is unlikely to replace appropriate medical treatment.
When to Consider Prescription Treatment
If you have heartburn most days, symptoms that regularly disturb your sleep, or you need pharmacy medicines frequently, it is worth speaking to a doctor or pharmacist rather than continuing to self treat. NHS guidance recommends medical advice when pharmacy medicines and lifestyle changes are not helping or when heartburn happens most days.
For GORD, NICE recommends a course of a proton pump inhibitor. The exact medicine, dose and length of treatment depend on your symptoms and clinical circumstances.
An online consultation with UK registered prescribers can be completed without waiting for a face to face appointment. Treatment suitability depends on an individual clinical assessment, and your prescriber will determine the appropriate treatment.
| Treatment | Strength | From |
|---|---|---|
| Omeprazole | 20mg | £12.99 |
| Pantoprazole | 20mg | £5.99 |
Prices are confirmed at checkout and the live product page takes precedence over any figure quoted here. Medicines are dispensed by a UK pharmacy operating under GPhC regulation, with full labelling and a patient information leaflet.
Medical Disclaimer
This article is provided for general information only and does not constitute medical advice. It is not a substitute for a consultation with a qualified healthcare professional. Always read the patient information leaflet supplied with your medicine, and follow the instructions on the pack or from your pharmacist or prescriber.
Do not start, stop or combine medicines based on this page alone. If your symptoms persist, worsen or are accompanied by any of the warning features described above, seek medical advice.
