Omeprazole
From £12.99
Omeprazole 20mg is the standard dose commonly used to treat gastro oesophageal reflux disease (GORD) and reflux oesophagitis. Omeprazole 10mg is a licensed lower strength that may be suitable for some people, including those who respond well to a lower dose or need maintenance treatment after their symptoms are controlled. It is not an ineffective or token dose.
For UK adults who have been prescribed, offered, or are considering 10mg or 20mg omeprazole for acid related symptoms, this guide compares the two strengths so you can understand how they are used and why your prescriber might choose one over the other.
It also explains why 10mg is less commonly stocked, what NICE guidance means by a standard or lower dose, what to know about side effects and longer term treatment, and when to speak to a prescriber. The right strength depends on why you are taking omeprazole and how you respond to treatment, so it is not something to change based on price or symptoms alone.
Key things to know
- NICE describes omeprazole 20mg once daily as the standard or full dose for GORD, while 10mg can be used as a lower or on demand dose in some circumstances
- 10mg is a genuine licensed strength. It may be used for some people with symptomatic GORD, for long term management after reflux oesophagitis has healed, or when a lower dose is suitable
- 20mg is more commonly used and stocked because it is the usual treatment dose for GORD and several other acid related conditions
- Higher doses such as 40mg are used for specific conditions or more severe disease and should be taken only when prescribed
- The best strength depends on the condition being treated, your symptoms, your response to treatment and your medical history
Which Strength Is the "Standard" Dose?
For adults with GORD, omeprazole 20mg once daily is generally the standard or full treatment dose. NICE lists 20mg once daily as the full dose and 10mg once daily as a low or on demand dose in its guidance.
That does not mean 10mg is ineffective. The current UK product information for omeprazole says that people with symptomatic GORD may respond adequately to 10mg daily, so the dose can be adjusted to the individual. It also lists 10mg once daily as a dose for the long term management of healed reflux oesophagitis.
So, in simple terms, 20mg is the usual full treatment dose for GORD, while 10mg is the lower option that may be appropriate for some people.
When 10mg Is Actually Used
- For some people whose GORD symptoms respond adequately to a lower dose
- As a maintenance dose after reflux oesophagitis has healed
- As a lower dose for some people with liver impairment, where 10mg to 20mg may be sufficient
- As part of an individual dose adjustment when a lower amount is enough to control symptoms
- In some licensed products for short term treatment, depending on the product and whether it is prescription only or available from a pharmacy
The exact reason for using 10mg matters. It is not simply a "gentler" version of 20mg that everyone with mild symptoms should choose. Your prescriber or pharmacist can help decide whether 10mg is suitable for you.
If you are using an omeprazole product bought without a prescription, follow the instructions on that particular pack. NHS guidance says not to take omeprazole bought without a prescription for longer than 2 weeks without speaking to a doctor.
Full UK Omeprazole Dosing Range
| Dose level | Strength | Typical use |
|---|---|---|
| Lower dose | 10mg | Some people with symptomatic GORD or maintenance treatment |
| Standard/full dose | 20mg | Typical treatment dose for GORD and several other acid related conditions |
| Higher dose | 40mg | Used for conditions such as severe reflux oesophagitis when prescribed |
| Zollinger Ellison syndrome | Individually adjusted, often 60mg or more | Specialist managed treatment |
These are examples of how omeprazole can be prescribed, rather than a general dosing schedule for everyone. The dose depends on the condition being treated. For example, the current product information lists 20mg once daily for reflux oesophagitis, with 40mg once daily used for severe oesophagitis. Zollinger Ellison syndrome requires individual dose adjustment and can involve much higher doses under specialist care.
A higher dose is not automatically better or faster for every type of heartburn. It should be used when there is a clinical reason for it.
Why 10mg Isn't Commonly Stocked
20mg is more commonly stocked because it is the usual full treatment dose for GORD and is also used for several other acid related conditions. Licensed 10mg products are available in the UK, but individual pharmacies may not keep them as standard stock.
If your prescriber has specifically recommended 10mg and your usual pharmacy does not have it, that does not mean the strength is unsuitable or ineffective. It may simply be a matter of which products that pharmacy normally keeps in stock.
If you are buying from an online pharmacy, check that the exact strength you need is available and that the medicine is supplied following an appropriate clinical assessment where required.
Does a Lower Strength Mean Weaker Symptom Control?
A lower dose contains less omeprazole, so it generally provides less acid suppression than a higher dose. However, that does not mean 10mg is unsuitable for everyone.
The current UK product information states that some people with symptomatic GORD may respond adequately to 10mg daily. It also recommends 10mg once daily for the long term management of some people whose reflux oesophagitis has healed.
If you are taking 10mg and your symptoms are not controlled, do not simply increase the dose yourself. Speak to your prescriber or pharmacist. They can check whether you need a different dose, a longer treatment course, further investigation, or another approach.
Who Might Be Prescribed 10mg Specifically
10mg may be prescribed when a lower dose is considered appropriate for the person's condition and response to treatment.
For example, the UK product information lists 10mg once daily for the long term management of healed reflux oesophagitis. It also says that some people with symptomatic GORD may respond adequately to 10mg daily. In people with impaired liver function, a daily dose of 10mg to 20mg may be sufficient.
Older age on its own does not mean that someone needs 10mg. The current product information says that dose adjustment is not normally needed in older adults. The decision should instead take the person's condition, other medicines and overall health into account.
How Omeprazole Actually Works, Whatever the Strength
Omeprazole is a proton pump inhibitor (PPI). It reduces the amount of acid produced by the stomach by blocking proton pumps in the cells that make stomach acid.
The basic action is the same at 10mg and 20mg. The difference is the amount of medicine being taken, which can affect the degree of acid suppression.
Omeprazole does not always give immediate relief. Some people start to feel better within a few days, while others may need longer treatment depending on the condition being treated. If symptoms are not improving as expected, speak to your pharmacist or prescriber rather than increasing the dose yourself.
Taking omeprazole as prescribed and following the instructions for your particular product is important. NHS guidance recommends taking it at around the same time each day.
Long Term Use: Monitoring Regardless of Strength
Long term PPI treatment can be associated with certain risks, including low magnesium levels, vitamin B12 deficiency and weakened bones or fractures. NHS guidance notes that the chance of some serious side effects can be higher when omeprazole is taken for a long time, particularly for a year or more.
This does not mean that these problems will happen to everyone taking 10mg or 20mg.
If you need omeprazole for a long period, your prescriber should review whether you still need treatment and whether the current dose remains appropriate. NICE guidance supports using the lowest dose that controls symptoms when ongoing PPI treatment is needed.
If you have been taking omeprazole for a long time without a review, it is reasonable to ask your prescriber or pharmacist whether your treatment still needs to continue at the same dose.
Side Effects: The Same Across Strengths
The types of side effects can be similar with 10mg and 20mg omeprazole because both contain the same active medicine. Common side effects include headache, stomach pain, nausea or vomiting, constipation, diarrhoea and increased wind. Dizziness can also occur.
Not everyone gets side effects, and having a higher dose does not mean that you will definitely experience more side effects. If you notice symptoms that are persistent, troublesome or unusual, speak to your pharmacist or doctor.
Serious allergic reactions are rare but can happen. Seek urgent medical attention if you develop symptoms such as swelling of the throat or tongue or difficulty breathing.
If you have previously had an allergic reaction to omeprazole or another proton pump inhibitor, tell your doctor or pharmacist before taking it.
Treatment Duration
How long you need omeprazole depends on why you are taking it.
For symptomatic GORD, the UK product information recommends 20mg daily and says that further investigation should be considered if symptoms have not been controlled after 4 weeks. For reflux oesophagitis, treatment is commonly prescribed for 4 to 8 weeks, depending on the severity and response.
Some people need longer term treatment, particularly when they have a condition that is likely to return. In these situations, the aim is generally to use the lowest dose that continues to control symptoms.
If you bought omeprazole without a prescription, NHS guidance says not to take it for longer than 2 weeks without speaking to a doctor.
Available Treatments
| Treatment | Price |
|---|---|
| Lansoprazole 15mg Capsules | From £5.99 |
| Pantoprazole | From £5.99 |
| Famotidine Tablets | From £8.49 |
| Lansoprazole 15mg Orodispersible Tablets | From £8.49 |
| Esomeprazole | From £16.99 |
| Omeprazole 20mg | From £12.99 |
| Rabeprazole | From £19.99 |
| Losec MUPS 20mg Tablets | From £29.99 |
The medicines listed above do not all work in exactly the same way. Omeprazole, lansoprazole, pantoprazole, esomeprazole and rabeprazole are proton pump inhibitors, while famotidine is an H2 receptor antagonist.
The right treatment depends on your symptoms, medical history and any other medicines you take. If you are already taking omeprazole and considering another acid reducing medicine, speak to a pharmacist or prescriber before making a change.
Omeprazole can also interact with some medicines and herbal remedies, including clopidogrel, warfarin, diazepam, phenytoin, certain HIV medicines and St John's wort. Tell your pharmacist or prescriber about everything you take, including vitamins and supplements.
Medical Disclaimer
This page provides general information about omeprazole strengths. It is not a substitute for personalised medical advice.
Do not change from 10mg to 20mg, or from 20mg to 10mg, without discussing it with your prescriber or pharmacist. The right dose depends on why you are taking omeprazole and how you respond to treatment.
If your symptoms are not improving, keep coming back, or are getting worse, speak to a healthcare professional. NHS guidance also recommends seeing a GP if symptoms do not improve or get worse when using omeprazole bought without a prescription.
Seek medical advice promptly if you have warning symptoms such as difficulty swallowing, repeated vomiting, vomiting blood, black stools, or unexplained weight loss. These symptoms can have causes that need further investigation.
