Omeprazole
From £12.99
Omeprazole is one of several proton pump inhibitors, or PPIs, used in the UK to treat acid related conditions, including acid reflux and heartburn. A 40mg dose is higher than the commonly used 20mg dose, but it is not the maximum dose for every condition. Some people with specific conditions may be prescribed higher doses under specialist supervision.
For adults in the UK who have been prescribed omeprazole, are considering it, or want to understand how 40mg compares with other PPIs, it helps to know when a higher dose may be used, how the doses compare within the same medicine class, and whether omeprazole is taken once or twice daily.
This guide explains what omeprazole is, the doses commonly used in the UK, how it compares with other PPIs, and when a higher dose may be considered. It also explains how to access PPI treatment through an online consultation. Treatment suitability depends on an individual clinical assessment, and your prescriber will determine the PPI and dose that are appropriate for you.
Is Omeprazole a PPI?
Yes. Omeprazole is a proton pump inhibitor, or PPI. It works by reducing the amount of acid produced by the stomach. PPIs are used to treat conditions such as GORD, heartburn, stomach ulcers and reflux oesophagitis. Omeprazole is also used with antibiotics to help treat H. pylori infection.
Other PPIs used in the UK include esomeprazole, lansoprazole, pantoprazole and rabeprazole. They work in a similar way, but their doses, licensed uses and interactions with other medicines can differ.
Omeprazole is usually taken by mouth as a capsule, tablet or liquid, depending on the product. It may be prescribed once or twice a day depending on the condition and treatment plan.
What Is the Maximum Dose of Omeprazole?
There is no single maximum dose that applies to every condition.
For many standard adult treatments, including GORD, reflux oesophagitis and some stomach or duodenal ulcers, doses of up to 40mg once daily are used. The exact dose depends on the condition and how well it responds to treatment.
Higher doses can be used for specific conditions. For example, in Zollinger Ellison syndrome, the dose is adjusted individually. UK product information gives an initial dose of 60mg daily, with some patients requiring 20mg to 120mg daily. When the dose is above 80mg a day, it should be divided into two doses. This is specialist treatment and is not the usual approach for GORD or ordinary heartburn.
How Often Is Omeprazole Taken? Understanding Omeprazole Frequency
How often you take omeprazole depends on the dose and the condition being treated.
A 20mg dose is commonly taken once daily. Some people are prescribed 40mg once daily, while other treatment plans may use divided doses. NHS guidance says that omeprazole is usually taken once or twice a day, with once daily treatment generally taken at the same time each morning and twice daily treatment taken at the same time each morning and evening.
Do not split a dose or change from once daily to twice daily unless your prescriber has told you to do so.
If you miss a dose, take it when you remember unless it is nearly time for your next dose. If it is nearly time, skip the missed dose and take the next one as usual. Do not take two doses at the same time to make up for a missed dose.
PPI Equivalent Doses: How Omeprazole Compares
PPIs are not compared simply by looking at the number of milligrams. Different medicines can have different doses while providing broadly similar levels of acid suppression.
NICE uses dose comparisons when setting out standard and higher PPI doses for GORD. For example, its guidance lists omeprazole 20mg once daily, lansoprazole 30mg once daily and pantoprazole 40mg once daily as standard doses. The guidance also gives higher or double doses for situations such as severe oesophagitis.
| PPI | Common standard dose | Higher or double dose used in some circumstances |
|---|---|---|
| Omeprazole | 20mg once daily | 40mg once daily or, for severe oesophagitis, 40mg twice daily |
| Esomeprazole | 20mg once daily in NICE dose comparisons | 40mg once daily or, for severe oesophagitis, 40mg twice daily |
| Rabeprazole | 20mg once daily | 20mg twice daily in higher dose regimens |
| Lansoprazole | 30mg once daily | 30mg twice daily in higher dose regimens |
| Pantoprazole | 40mg once daily | 40mg twice daily in higher dose regimens |
Some of the higher doses in the table are off label for GORD, so they should not be treated as routine doses that you can increase to yourself. The exact licensed dose also depends on the condition being treated.
These figures are useful for understanding how PPI doses are compared, but they do not mean that the medicines are interchangeable without clinical advice. The right PPI and dose depend on your condition, other medicines and individual circumstances.
Is 40mg of Omeprazole a High Dose in the UK?
Compared with the commonly used 20mg dose, 40mg is a higher dose of omeprazole. It may be prescribed for conditions such as severe reflux oesophagitis or for some ulcers. UK product information lists 40mg once daily for severe oesophagitis, with treatment generally lasting up to eight weeks.
For GORD, NICE describes 40mg once daily as a double dose compared with the standard 20mg dose. However, the dose you need depends on your symptoms, diagnosis and response to treatment.
A higher dose is not automatically better. If your symptoms are not controlled by your current dose, speak to your prescriber rather than increasing the amount yourself.
Is 80mg of Omeprazole a High Dose?
For standard GORD or heartburn treatment, 80mg a day is higher than the doses usually used.
Higher doses can be appropriate for certain conditions. In Zollinger Ellison syndrome, UK product information reports doses of 20mg to 120mg daily, with an initial dose of 60mg daily. Doses above 80mg a day should be divided into two doses.
Omeprazole 40mg twice daily gives a total of 80mg a day. This is not a routine dose for ordinary GORD or heartburn and should only be taken if specifically prescribed.
What Is the Maximum Dose of PPI Medication Generally?
There is no single maximum dose for all PPIs. Each medicine has its own dosing range, and the appropriate dose also depends on the condition being treated.
For example, NICE lists different standard and double doses for omeprazole, esomeprazole, lansoprazole, pantoprazole and rabeprazole. Some higher doses are used for severe oesophagitis and may be off label for GORD.
Very high dose PPI treatment can be used for conditions involving excessive stomach acid production, such as Zollinger Ellison syndrome. These treatment plans are individually adjusted and are managed by a specialist.
Branded vs Generic Omeprazole
EverydayMeds stocks generic omeprazole capsules and Losec MUPS, a branded omeprazole product. Both contain omeprazole as the active ingredient, but their formulations can differ. Losec MUPS is supplied as tablets containing omeprazole magnesium, while generic products may be supplied in different formulations.
If you are switching between products, check the strength and formulation and follow the instructions provided with the medicine. A pharmacist or prescriber can help if you are unsure whether a particular product is suitable.
Available PPI Treatment Options
EverydayMeds stocks omeprazole 20mg capsules and Losec MUPS 20mg tablets, alongside alternative PPIs including lansoprazole 15mg capsules and orodispersible tablets, pantoprazole, esomeprazole and rabeprazole.
Some acid reflux medicines are available without a prescription, while other strengths and treatments require a prescription. Famotidine tablets are an H2 receptor antagonist and work differently from PPIs. They may be considered as an alternative treatment in some circumstances.
The right treatment depends on the cause of your symptoms, your medical history and any other medicines you take.
How to Get Omeprazole or an Alternative PPI Through EverydayMeds
Getting a PPI through EverydayMeds starts with a short online questionnaire about your symptoms, medical history, current medicines and relevant health conditions. The information is reviewed by a UK registered prescriber, who will assess whether the requested treatment is suitable and what dose may be appropriate.
If omeprazole is not suitable, your prescriber can consider whether another treatment option may be more appropriate.
Before starting or changing treatment, speak to your prescriber, GP, pharmacist or another healthcare professional, particularly if you are pregnant, breastfeeding, have liver problems or take other medicines.
If you develop side effects or have concerns about your treatment, speak to a healthcare professional. People taking PPIs for a longer period may need their treatment reviewed, particularly if there are risk factors for problems such as low magnesium or vitamin B12 deficiency.
