Acid Reflux Medication Guide
Acid reflux, and its more persistent form, gastro oesophageal reflux disease (GORD), is one of the most common reasons people look for treatment in the UK. With so many options available, including antacids, H2 blockers and proton pump inhibitors (PPIs), it can be difficult to know which one is right for you. This guide explains how each type of medicine works, which symptoms it may help with, and the difference between prescription and over the counter options.
1. What Causes Acid Reflux?
Acid reflux happens when stomach acid flows back into the oesophagus, causing the burning sensation known as heartburn. Common symptoms can also include chest pain, a sore throat, a hoarse voice, an unpleasant taste in the mouth, abdominal pain, bad breath and a persistent cough. Symptoms often become worse after eating or when lying down.
If these symptoms happen regularly or continue over time, the condition is usually referred to as gastro oesophageal reflux disease (GORD). Reflux occurs when stomach acid moves upwards and irritates the lining of the oesophagus. This can happen if the lower oesophageal sphincter, the muscle that normally helps keep stomach contents in place, is not working as effectively as it should. Certain foods, including spicy foods, along with other lifestyle factors, may make symptoms more likely for some people.
2. The Three Main Types of Acid Reflux Medicine
Antacids
Antacids work quickly by neutralising acid that is already in your stomach, making them a common over the counter option for occasional heartburn. They are best suited to mild or infrequent symptoms rather than ongoing reflux. Many are available as chewable tablets and may provide relief for a few hours. Some contain sodium bicarbonate to help neutralise stomach acid. While they work quickly, they do not reduce the amount of acid your stomach produces. Alginates are another over the counter option that form a protective barrier over the stomach contents, which may help reduce reflux symptoms.
H2 Receptor Antagonists (H2 Blockers)
H2 blockers, such as famotidine, reduce stomach acid by blocking histamine receptors that trigger acid production. Ranitidine was withdrawn from the UK market in 2020 because of safety concerns. H2 blockers usually start working sooner than PPIs but may not provide the same level of acid control throughout the day. They may be suitable for occasional breakthrough symptoms or for people who prefer to take treatment only when needed.
Proton Pump Inhibitors (PPIs)
PPIs, including omeprazole, lansoprazole, pantoprazole, esomeprazole and rabeprazole, reduce stomach acid by blocking the acid pumps in the stomach lining. They generally provide the longest lasting reduction in stomach acid and are commonly used for moderate to severe acid reflux or GORD, particularly when the oesophagus needs time to heal. They may take a few days to reach their full effect rather than working immediately. Omeprazole 20mg is one of the most commonly prescribed PPIs in the UK, and Prilosec OTC is an over the counter omeprazole brand that some readers may recognise. Common side effects can include headache and diarrhoea.
3. Is There a "Strongest" Acid Reflux Medicine?
This is a common question, but there is not a single medicine that is best for everyone. PPIs generally provide the most complete and long lasting reduction in stomach acid, which is why they are often recommended for moderate to severe or persistent reflux.
However, the most suitable treatment depends on your symptoms and medical history. Someone with occasional heartburn may find an antacid works well, while someone with ongoing GORD may benefit from a PPI recommended by their healthcare professional. The right choice depends on an individual clinical assessment rather than simply choosing the strongest medicine available.
Quick answer for a rushed reader
Antacids: Fast acting, short term relief for occasional heartburn and acid reflux.
H2 blockers: Reduce stomach acid more than antacids and work relatively quickly. They can be useful for occasional symptoms or as needed.
PPIs: Provide the longest lasting reduction in stomach acid and are generally the first choice for moderate to severe acid reflux or GORD.
4. Prescription vs Over the Counter: What's the Difference?
Several acid reflux medicines are available both on prescription and over the counter, which can sometimes be confusing. Lower strength doses and smaller pack sizes of some PPIs and H2 blockers can be bought directly from a pharmacy for short term treatment of occasional symptoms.
Higher strength doses, larger pack sizes, or treatment intended for longer term use usually require a prescription or an online consultation with a prescriber. This helps make sure the medicine, dose and treatment duration are appropriate for you.
If you are unsure whether the medicine or strength you need is available over the counter, ask your pharmacist. In many cases, it depends on the dose and how long you are expected to take it, rather than the medicine itself.
5. How to Take PPIs Correctly
You may have heard that PPIs must always be taken on an empty stomach 30 to 60 minutes before eating. In reality, it is a little more flexible than that. NHS guidance and the UK product information for omeprazole state that it can be taken with or without food. The most important thing is to take it at the same time each day, usually in the morning, or morning and evening if you have been prescribed two doses a day.
Some healthcare professionals still recommend taking a PPI shortly before a meal because the stomach's acid pumps are more active around mealtimes. While this may be helpful for some people, it is not a strict requirement. Always follow the instructions provided with your medicine or the advice from your pharmacist or prescriber.
6. Treatment Duration and Long Term Use
A short course, usually lasting a few days to a couple of weeks, is often enough for occasional heartburn. Medicines often work best when combined with simple lifestyle changes, such as eating smaller, more frequent meals, avoiding food for 3 to 4 hours before going to bed, maintaining a healthy weight where appropriate, and limiting alcohol if it triggers your symptoms.
People with GORD or more persistent symptoms may need a longer course of treatment, often lasting several weeks. If you take a PPI long term, UK guidance recommends reviewing your treatment at least once a year. Your GP or pharmacist may suggest reducing to the lowest effective dose or using the medicine only when needed, where appropriate.
If you have been taking acid reflux medicine for a long time, it is worth discussing your treatment with your GP or pharmacist, even if your symptoms are well controlled. Wearing loose fitting clothing around the waist may also help reduce pressure on the stomach and improve reflux symptoms.
7. Can You Take Acid Reflux Medicine with Mounjaro?
If you are taking Mounjaro (tirzepatide) alongside a PPI such as omeprazole or lansoprazole, there are no known specific interactions between these medicines. They work in different ways, with Mounjaro affecting gut hormone receptors and PPIs reducing stomach acid.
One thing to be aware of is that GLP 1 medicines such as Mounjaro can slow stomach emptying. This means food and some oral medicines may stay in the stomach for longer than usual. This is a general consideration for many oral medicines and is not a specific concern with PPIs. It is still a good idea to let your prescriber know about all the medicines you are taking so they can advise you appropriately.
Do not stop or change either medicine without speaking to your prescriber first, as stopping a PPI suddenly may lead to temporary rebound acid symptoms.
8. Comparing Acid Reflux Medicine Types
This is a general comparative context, not a recommendation that any one option is right for you specifically. Treatment suitability depends on an individual clinical assessment.
| Type | Examples | Onset | Best suited to |
|---|---|---|---|
| Antacids | Various OTC brands | Minutes | Occasional, mild symptoms |
| H2 blockers | Famotidine | Faster than PPIs | Breakthrough symptoms, as-needed use |
| PPIs | Omeprazole, lansoprazole, pantoprazole, esomeprazole, rabeprazole | Builds over days | Moderate to severe reflux, GORD, ongoing management |
Current Indicative Pricing
Prices update live and may change. The live pricing shown during your consultation always takes precedence over this table.
| Product | From |
|---|---|
| Pantoprazole | £5.99 |
| Lansoprazole 15mg Capsules | £5.99 |
| Famotidine Tablets | £8.49 |
| Lansoprazole 15mg Orodispersible Tablets | £8.49 |
| Omeprazole 20mg | £12.99 |
| Esomeprazole | £16.99 |
| Rabeprazole | £19.99 |
| Losec MUPS 20mg Tablets | £29.99 |
Key Takeaways
- Acid reflux medicines fall into three main groups: antacids for fast, short term relief, H2 blockers for moderate acid reduction that can be used as needed, and PPIs, which provide the longest lasting acid reduction and are commonly used for persistent symptoms or GORD.
- PPIs can be taken with or without food. Some people find taking them shortly before a meal works well, but this is a helpful routine rather than a strict requirement.
- Whether a medicine is available on prescription or over the counter usually depends on the strength, pack size and intended length of treatment, rather than the medicine itself.
- If you take a PPI long term, it is a good idea to have your treatment reviewed regularly. Your GP or pharmacist may recommend using the lowest dose that keeps your symptoms under control.
- There are no known specific interactions between PPIs, such as omeprazole or lansoprazole, and Mounjaro (tirzepatide). However, it is always important to let your prescriber know about all the medicines you are taking.
