Omeprazole Not Working for Acid Reflux? What's Actually Going On

If omeprazole does not feel like it is controlling your symptoms, whether you are taking 20mg or 40mg, this does not necessarily mean that the medicine has failed or that you are doing anything wrong. There are several reasons why reflux symptoms can continue during treatment, and the answer is not always to take a higher dose.

Omeprazole reduces stomach acid, but not every symptom that feels like reflux is caused by excess stomach acid. The timing of treatment, missed doses, other health conditions, lifestyle factors and the original diagnosis can all make a difference.

This guide explains what may be happening, what to know about twice daily and alternate day dosing, what to do if you accidentally take an extra dose, and when persistent symptoms need a proper review with your prescriber.

Key things to know

• Alternate day dosing may sometimes be used as part of a prescriber directed long term treatment plan, but it is not something to start yourself.
• Twice daily omeprazole is used for some specific conditions and treatment regimens. It is not a general solution for reflux symptoms that have not settled.
• An accidental extra dose is unlikely to cause serious harm in most people, but deliberately taking extra doses is not recommended without medical advice.
• If symptoms continue despite taking omeprazole as prescribed, the next step is a review rather than simply increasing your dose.
• Persistent reflux symptoms can have causes other than excess stomach acid, so your prescriber may need to reconsider the diagnosis or treatment.

Why Omeprazole Might Not Feel Like It Is Working Yet on Stomach Acid

Omeprazole does not usually provide immediate relief in the way an antacid can. It works by reducing the production of stomach acid, and its maximum acid reducing effect is reached after several days of regular treatment. UK product information states that maximum effect is achieved within about 4 days with once daily dosing.

That does not mean that everyone will feel better within 4 days. Reflux symptoms can take longer to settle, and some people may continue to have symptoms even when stomach acid is being reduced.

Taking your medicine consistently is important. Missing doses can make it harder to assess whether the treatment is helping, particularly if you are still early in your course.

If your symptoms are not improving, are getting worse or continue despite taking omeprazole as prescribed, speak to your prescriber rather than simply increasing the dose yourself. NICE recommends reviewing people whose GORD symptoms do not respond adequately to treatment.

Genuine Reasons Omeprazole May Not Fully Control Your Symptoms

• Inconsistent dosing, such as regularly missing doses, can make treatment less consistent.
• The symptoms may not be caused entirely by stomach acid. Conditions such as a hiatus hernia or problems with how the stomach empties can contribute to symptoms and may need a different approach.
• H. pylori infection can be linked to stomach ulcers and some other upper digestive problems. When treatment is needed, it involves specific eradication therapy rather than simply continuing a PPI on its own.
• Smoking can make reflux symptoms worse, so continuing to smoke may make symptoms harder to control.
• Foods, drinks or habits that trigger your symptoms can continue to cause discomfort even while you are taking omeprazole.
• The original diagnosis may need to be reconsidered. Heartburn and reflux like symptoms can have different causes, and not all of them respond to acid reducing treatment.

None of these automatically means that omeprazole has failed. They are reasons why persistent symptoms may need a closer look rather than simply a higher dose.

Testing for H. pylori: Worth Asking About

If you have not been tested for Helicobacter pylori, you can ask your prescriber whether testing is appropriate for you. H. pylori is a type of bacteria associated with stomach ulcers and can require specific treatment if it is found.

Testing can include a breath test or stool test. If H. pylori is detected, treatment usually involves a combination of a PPI and antibiotics rather than omeprazole on its own. The exact medicines and duration depend on the treatment regimen prescribed.

One important point is that PPIs can affect H. pylori testing. You may need to stop taking your PPI before the test to reduce the chance of an inaccurate result. Do not stop your omeprazole without checking first. Your doctor or pharmacist can tell you when to stop it and when to restart it based on the type of test being used. NHS guidance also notes that omeprazole can affect the results of some medical tests.

Can I Take Omeprazole Twice a Day?

Twice daily omeprazole is used in some specific treatment situations, but it is not something to add yourself simply because once daily treatment does not seem to be working.

For example, some H. pylori eradication regimens use omeprazole twice daily alongside antibiotics. Certain other conditions may also require individually adjusted doses. For Zollinger Ellison syndrome, for example, higher total daily doses may be divided into two doses.

For ordinary GORD symptoms, NICE recommends reviewing the response to a full dose PPI rather than automatically moving to twice daily treatment. If treatment is not working well enough, your prescriber may consider another approach, which can include a dose adjustment, another PPI, an H2 receptor antagonist or further investigation depending on the situation.

If you are asking about twice daily dosing because your current dose does not feel strong enough, speak to your prescriber before changing it.

What Happens If I Take a Double Dose?

If you accidentally take an extra dose of omeprazole, serious problems are not usually expected, but you may be more likely to notice side effects. These can include headache, nausea, vomiting, diarrhoea, stomach pain or dizziness.

If you have taken more than your prescribed dose, check the advice in your medicine's patient information leaflet and contact your doctor, pharmacist or NHS 111 if you are concerned.

Do not deliberately take two doses together because you think it will provide faster or stronger relief. Taking extra omeprazole is not a reliable way to treat breakthrough symptoms.

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 your next dose as normal. Do not take two doses to make up for a missed one.

Can You Take Omeprazole Every Other Day?

Alternate day or as needed PPI treatment can be considered for some people after their symptoms have been controlled, particularly when a lower level of treatment is appropriate for long term management. NICE recommends discussing how people can manage their symptoms using treatment when needed and using the lowest dose that controls symptoms where appropriate.

However, alternate day dosing is not a general solution when your symptoms are currently uncontrolled. If you are taking omeprazole every other day because your prescriber has recommended this, follow their plan. If you are thinking about changing from daily to alternate day treatment yourself, speak to your prescriber first.

People with certain conditions, such as severe oesophagitis, may need ongoing full dose treatment, so reducing the frequency is not suitable for everyone.

Do You Need to Take Omeprazole Before Food?

NHS guidance states that omeprazole can be taken with or without food. There is no general requirement to take it 30 to 60 minutes before breakfast.

Some product information recommends taking omeprazole in the morning. Follow the instructions supplied with your particular medicine and any advice from your prescriber or pharmacist.

If you are taking omeprazole consistently and it is still not controlling your symptoms, speak to a healthcare professional before changing the timing or dose yourself.

What Actually Helps If Symptoms Persist: Lifestyle Changes and More

• Book a proper review with your prescriber rather than increasing your dose yourself.
• Keep a simple symptom diary for a week or two. Note when symptoms happen, what you ate or drank beforehand, whether they occur during the day or at night, and how severe they feel. This can give your prescriber useful information.
• Try smaller meals if large meals make your symptoms worse.
• If you are overweight, losing weight may help reduce GORD symptoms. Your healthcare professional can advise whether this is relevant for you.
• If you have night time reflux, raising the head of your bed may help.
• Take your omeprazole consistently and avoid regularly missing doses.
• Ask your prescriber whether H. pylori testing is appropriate if your symptoms continue.
• If you smoke, consider stopping or getting support to quit, as smoking can worsen reflux symptoms.
• Pay attention to your own food and drink triggers rather than avoiding a long list of foods unnecessarily. Common triggers can include coffee, alcohol, chocolate and fatty foods, but this varies between people.

When to Seek Urgent Help

• Difficulty swallowing, or pain when swallowing, that is new or getting worse
• Unexplained weight loss alongside your reflux symptoms
• Vomiting blood, or dark, tarry stools
• Persistent vomiting

These symptoms should not simply be put down to omeprazole not working. They can sometimes point to an underlying problem that needs medical assessment.

If you develop these symptoms, seek prompt medical advice rather than increasing your omeprazole dose yourself. UK product information specifically highlights significant unintentional weight loss, recurrent vomiting, difficulty swallowing, vomiting blood and black stools as alarm symptoms that require further investigation.

For people with persistent GORD symptoms that do not respond to treatment, NICE recommends further review and, where appropriate, specialist assessment.

Available Treatments

Antacids can be used for short term relief of mild heartburn, while H2 receptor antagonists are another type of medicine that reduces stomach acid. The right treatment depends on your symptoms and diagnosis.

Medical Disclaimer

This page provides general information for people whose omeprazole does not feel like it is fully controlling their symptoms. It is not a substitute for personalised medical advice.

Do not change your dose, start twice daily treatment, switch to alternate day dosing or deliberately take extra doses without discussing this with your prescriber or pharmacist.

If you purchased omeprazole without a prescription, NHS guidance says it should not be taken for longer than 14 days without speaking to a doctor.

Seek prompt medical attention if you develop any of the warning symptoms listed above.