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Esomeprazole 20mg – 28 pack

Esomeprazole 20mg – 28 pack

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  • ✔️ Reduces stomach acid production at source with once-daily dosing
  • ✔️ Relieves heartburn and acid reflux symptoms within 24–48 hours
  • ✔️ Clinically effective for gastro-oesophageal reflux disease (GORD)
  • ✔️ Gastro-resistant tablet protects active ingredient for optimal absorption
  • ✔️ Suitable for adults 18+ needing short-term acid reflux control

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What Is Esomeprazole 20mg and How Does It Help?

 

If you've ever felt that burning sensation creeping up your chest after a meal, you'll know how disruptive heartburn can be. Esomeprazole 20mg is a once-daily proton pump inhibitor (PPI) tablet used to reduce the amount of acid your stomach produces. It's widely used across the UK to treat heartburn, acid reflux, and the symptoms of gastro-oesophageal reflux disease (GORD). Available in a convenient 28-pack, it offers a full course of treatment at an accessible price of just £9.99. If you're managing ongoing digestive discomfort, you might also find our indigestion relief range helpful alongside this product.

Esomeprazole belongs to a class of medicines called proton pump inhibitors. It works at the source of the problem — the stomach's acid-producing cells — rather than simply neutralising acid after it's already been produced. That's what sets it apart from antacids. For adults aged 18 and over experiencing frequent heartburn or confirmed GORD, this tablet can make a real difference to daily comfort and quality of life.

 

How Does Esomeprazole 20mg Work to Reduce Stomach Acid?

 

The stomach lining contains specialised cells that use tiny molecular "pumps" — known as hydrogen-potassium ATPase enzymes — to secrete hydrochloric acid into the stomach. Esomeprazole works by irreversibly binding to and blocking these proton pumps, significantly reducing acid secretion. Here's a simplified breakdown of the mechanism:

  • Esomeprazole is absorbed in the small intestine and transported to the stomach's parietal cells.
  • It converts to its active form in the acidic environment of the secretory canaliculi.
  • It then binds to the proton pump, blocking acid production at the source.
  • Acid levels drop, allowing the oesophagus and stomach lining to begin healing.

Because the effect is cumulative, acid suppression tends to improve over the first few days of treatment. Most people notice meaningful relief within 24 to 48 hours of starting the course.

 

Who Is Esomeprazole 20mg Suitable For?

 

This tablet is suitable for adults aged 18 and over who experience frequent or persistent heartburn and acid reflux. It's particularly useful for people who haven't found adequate relief from antacids or H2 blockers. That said, it's not right for everyone — and it's important to check before starting.

Esomeprazole 20mg may be appropriate if you:

  • Experience heartburn two or more times per week
  • Have been diagnosed with gastro-oesophageal reflux disease (GORD)
  • Need short-term relief from acid reflux symptoms (up to 14 days OTC)
  • Are looking for a once-daily tablet that fits easily into your routine

It is not suitable for children under 18 for OTC use, or for people with certain allergies or drug interactions. Always read the label carefully and speak to your pharmacist if you're unsure.

 

How Does Esomeprazole 20mg Compare to Other Acid Reflux Treatments?

 

Feature Esomeprazole 20mg Omeprazole 20mg
Drug class Proton pump inhibitor (PPI) Proton pump inhibitor (PPI)
Dosing frequency Once daily Once daily
OTC availability in UK Yes Yes
Onset of action Within 1–2 hours; full effect in 2–3 days Within 1–2 hours; full effect in 2–3 days

 

Is Esomeprazole 20mg Safe to Store at Home?

 

Yes — storing this medicine correctly is straightforward. Keep it in its original packaging, below 25°C, in a dry place away from direct sunlight. Do not store it in the bathroom, where humidity can affect the tablets. Keep it out of reach and sight of children at all times. If you're managing multiple health conditions and need to keep track of several medicines, our vitamins and supplements range also includes products that support general digestive wellbeing.

Do not use esomeprazole 20mg after the expiry date printed on the pack. If you have unused tablets, return them to your local pharmacy for safe disposal — do not flush them or throw them in household waste.

This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Esomeprazole 20mg – 28 Pack specifications
Treatment category Acid reflux, heartburn, GORD
Mechanism of action Proton pump inhibitor — blocks gastric acid secretion
Effective for Heartburn, acid reflux, GORD symptoms
Suitable for Adults aged 18 and over
Active ingredient Esomeprazole magnesium 20mg
Pack size 28 tablets
Strength 20mg
UK classification Pharmacy (P) medicine
Drug class Proton pump inhibitor (PPI)
Preparation Gastro-resistant tablet
Route of administration Oral

Specifications of Esomeprazole 20mg – 28 Pack

 

What Is Esomeprazole 20mg and What Is It Used For?

 

Esomeprazole 20mg is a gastro-resistant tablet belonging to the proton pump inhibitor (PPI) class of medicines. It is used to treat conditions caused by excess stomach acid, including heartburn, acid reflux, and gastro-oesophageal reflux disease (GORD). In GORD, stomach acid flows back up into the oesophagus, causing irritation, a burning sensation in the chest, and sometimes a sour taste in the mouth. Esomeprazole reduces the amount of acid produced, giving the oesophagus a chance to recover. It is available over the counter for short-term use in adults aged 18 and over.

 

What Do You Need to Know Before Using Esomeprazole 20mg?

 

Before taking this medicine, it's important to check whether it is appropriate for you. Do not take esomeprazole 20mg if any of the following apply:

  • You are allergic to esomeprazole, any other PPI (such as omeprazole, lansoprazole, pantoprazole), or any of the tablet's excipients
  • You are taking atazanavir or nelfinavir (HIV medicines)
  • You are under 18 years of age (for OTC use)
  • You have unexplained weight loss, difficulty swallowing, persistent vomiting, or blood in your vomit or stools — seek urgent medical advice instead
  • You have been told you have a pre-cancerous condition of the stomach

The following medicines may interact with esomeprazole. Tell your pharmacist or doctor if you are taking:

  • Clopidogrel (used to prevent blood clots)
  • Methotrexate (used for cancer or inflammatory conditions)
  • Ketoconazole or itraconazole (antifungal medicines)
  • Digoxin (used for heart conditions)
  • Warfarin or other anticoagulants
  • Tacrolimus or ciclosporin (immunosuppressants)

 

How Should You Take Esomeprazole 20mg Correctly?

 

Always take this medicine exactly as described on the label or as directed by your pharmacist. Do not exceed the recommended dose. Follow these steps:

  1. Take one 20mg tablet once daily, ideally 30–60 minutes before your first meal.
  2. Swallow the tablet whole with a glass of water — do not crush or chew it, as the gastro-resistant coating is essential for proper absorption.
  3. If you have difficulty swallowing, you may dissolve the tablet in a small amount of still water and drink immediately.
  4. Continue for up to 14 days. If symptoms persist beyond 14 days, stop and consult your GP.
  5. Do not take more than one tablet per day without medical supervision.
Indication Age Group Dose Frequency
Heartburn / acid reflux (OTC) Adults 18+ 20mg Once daily, before food
GORD (prescription-supervised) Adults 18+ 20mg–40mg Once daily (as directed by GP)
Children under 18 Under 18 Not for OTC use Prescription only

If you're also dealing with cramping or bowel discomfort alongside your reflux, you may find it useful to explore our IBS and cramps range for additional support.

 

What Are the Possible Side Effects of Esomeprazole 20mg?

 

Like all medicines, esomeprazole can cause side effects, although not everyone experiences them. Most are mild and temporary.

Common side effects (may affect up to 1 in 10 people):

  • Headache
  • Diarrhoea
  • Nausea or feeling sick
  • Stomach pain or abdominal discomfort
  • Flatulence (wind)
  • Constipation

Less common side effects (may affect up to 1 in 100 people):

  • Dizziness or drowsiness
  • Dry mouth
  • Skin rash or itching
  • Swelling of the feet or ankles
  • Disturbed sleep or insomnia
  • Low magnesium levels with long-term use (hypomagnesaemia)

Stop taking esomeprazole and seek immediate medical attention if you experience a severe allergic reaction (difficulty breathing, swelling of the face or throat, or a widespread skin rash). Long-term use of PPIs has also been associated with a small increased risk of bone fractures and Clostridium difficile infection — speak to your GP if you are concerned about extended use.

 

How Should You Store Esomeprazole 20mg?

 

Correct storage helps maintain the tablet's effectiveness throughout the pack. Follow these guidelines:

  • Store below 25°C in a cool, dry place
  • Keep in the original blister packaging until use
  • Do not store in the bathroom or near sources of heat or moisture
  • Keep out of the sight and reach of children
  • Do not use after the expiry date printed on the pack
  • Return unused tablets to your local pharmacy — do not dispose of in household waste

If you're managing a range of health products at home, our pain relief collection includes a variety of medicines that can be stored safely alongside esomeprazole.

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Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy esomeprazole 20mg online in the UK?

You can buy esomeprazole 20mg online from Cured Pharmacy, a GPhC-registered UK online pharmacy. It is available without a prescription for short-term use in adults aged 18 and over. Simply add it to your basket and complete a brief health questionnaire before checkout to ensure it is suitable for you.

How does esomeprazole 20mg work in the body?

Esomeprazole works by irreversibly blocking proton pumps — the enzyme systems in the stomach lining responsible for producing hydrochloric acid. By reducing acid output at the source, it relieves the burning sensation of heartburn and allows the oesophagus to heal. It is more targeted than antacids, which only neutralise acid that has already been produced.

How do I take esomeprazole 20mg step by step?

Take one tablet once daily, swallowed whole with a glass of water, ideally 30 to 60 minutes before your first meal of the day. Do not crush or chew the tablet, as the gastro-resistant coating is needed for proper absorption. Continue for up to 14 days; if symptoms persist, stop and speak to your GP.

What is the best time of day to take esomeprazole 20mg?

The most effective time to take esomeprazole is in the morning, around 30 to 60 minutes before breakfast. Taking it before food allows the medicine to be absorbed and reach the proton pumps before they are activated by eating. Consistency in timing each day helps maintain steady acid suppression throughout the course.

How do I manage side effects of esomeprazole 20mg?

Most side effects — such as headache, nausea, or mild stomach discomfort — are temporary and tend to settle within the first few days of treatment. Staying well hydrated and taking the tablet before food can help reduce nausea. If side effects are severe, persistent, or include signs of an allergic reaction, stop taking the tablet and contact your pharmacist or GP immediately.

Who is eligible to take esomeprazole 20mg over the counter?

Esomeprazole 20mg is suitable for adults aged 18 and over who experience frequent heartburn or acid reflux symptoms. It is not appropriate for children under 18 for OTC use, or for people taking certain medicines such as atazanavir, nelfinavir, or clopidogrel without medical supervision. If you have unexplained weight loss, difficulty swallowing, or blood in your stools, seek urgent medical advice rather than self-treating.

What happens if I miss a dose of esomeprazole 20mg?

If you miss a dose, take it as soon as you remember — unless it is nearly time for your next scheduled dose, in which case skip the missed one entirely. Never take two tablets at once to compensate for a missed dose. Simply continue with your regular once-daily schedule the following morning.

How does esomeprazole 20mg compare to omeprazole 20mg?

Both are proton pump inhibitors used to reduce stomach acid, and both are available over the counter in the UK. Esomeprazole is the S-isomer of omeprazole, meaning it is a more refined form of the same compound, and some clinical studies suggest it may provide slightly more consistent acid suppression in certain patients. In practice, both are effective for heartburn and GORD — your pharmacist can help you choose based on your individual circumstances.

How long can you take esomeprazole 20mg for?

For OTC use, esomeprazole 20mg should not be taken for more than 14 consecutive days without consulting a GP. If your symptoms return after a completed course, or if you need repeated courses, this may indicate an underlying condition that requires medical assessment. Long-term use is possible under GP supervision, but regular review is recommended to assess ongoing need and monitor for potential effects such as low magnesium levels.

Can I take esomeprazole 20mg during pregnancy or while breastfeeding?

Esomeprazole is not recommended during pregnancy or breastfeeding unless specifically advised by a doctor, as there is limited safety data for OTC use in these situations. If you are pregnant, planning to become pregnant, or breastfeeding, speak to your GP or midwife before taking any acid reflux medicine. They can advise on the safest option for your circumstances.

Can esomeprazole 20mg be taken with food or drink?

Esomeprazole should ideally be taken before eating rather than with food, as food can reduce its absorption. You can drink water with the tablet, but avoid taking it with fruit juice or carbonated drinks. Alcohol does not directly interact with esomeprazole, but it can worsen acid reflux symptoms, so it is best to limit alcohol intake during treatment.

What are the alternatives to esomeprazole 20mg for acid reflux?

Alternatives include other PPIs such as omeprazole and lansoprazole, H2 receptor antagonists such as famotidine, and antacids such as calcium carbonate or sodium alginate preparations. For mild, occasional heartburn, antacids may be sufficient, while PPIs are generally more effective for frequent or persistent symptoms. You can explore our indigestion range to compare available options.

Does esomeprazole 20mg interact with any common medicines?

Yes — esomeprazole can interact with several medicines, including clopidogrel (a blood thinner), methotrexate, ketoconazole, digoxin, warfarin, and HIV medicines such as atazanavir. These interactions can either reduce the effectiveness of the other medicine or increase the risk of side effects. Always tell your pharmacist about all medicines, supplements, and herbal remedies you are taking before starting esomeprazole.

What are the latest findings on long-term PPI use?

Research has highlighted that long-term PPI use — typically defined as more than 8 weeks — may be associated with a small increased risk of bone fractures, low magnesium levels (hypomagnesaemia), and Clostridium difficile infection. Regulatory bodies including the MHRA have issued guidance recommending that PPIs are used at the lowest effective dose for the shortest necessary duration. If you require ongoing acid suppression, your GP should review your treatment regularly. You can also support your general health with products from our vitamins and supplements range.

Is esomeprazole 20mg suitable for people with IBS or stomach cramps?

Esomeprazole is specifically designed to reduce stomach acid and is not a treatment for irritable bowel syndrome (IBS) or stomach cramps caused by other conditions. However, some people with overlapping symptoms of acid reflux and IBS may benefit from acid suppression alongside other treatments. If you experience cramping or bowel symptoms alongside reflux, speak to your GP, and consider browsing our IBS and cramps collection for additional support options.

How Should You Use Esomeprazole 20mg?

Esomeprazole 20mg gastro-resistant tablets are designed to be taken orally, once a day. The gastro-resistant coating is essential — it protects the active ingredient from stomach acid so it can be absorbed properly in the small intestine. Follow these steps carefully each time you take a dose:

If you accidentally take more than one tablet in a day, contact your pharmacist or NHS 111 for advice. Do not take a double dose the following day.

What Is the Correct Dose of Esomeprazole 20mg?

The correct dose depends on your age and the condition being treated. For OTC use, the standard adult dose is one 20mg tablet once daily. Do not exceed this dose without medical supervision. The table below summarises dosing by indication and age group:

When Is the Best Time to Use Esomeprazole 20mg?

Esomeprazole works most effectively when taken in the morning, approximately 30 to 60 minutes before breakfast. This timing ensures the medicine is absorbed and active before food triggers acid production in the stomach. Taking it at the same time each day also helps you build a consistent routine, which is important for maintaining steady acid suppression throughout the 14-day course.

Avoid taking esomeprazole immediately before bed or after eating, as this reduces its effectiveness. If you occasionally forget your morning dose and have already eaten, take it as soon as you remember — but skip it entirely if your next dose is due within a few hours.

How Long Can You Use Esomeprazole 20mg For?

For over-the-counter use, esomeprazole 20mg should not be taken for more than 14 consecutive days without consulting a GP. If your symptoms resolve before 14 days, you can stop the course early. However, if symptoms persist after the full 14-day course, or if they return shortly after stopping, this may indicate an underlying condition such as GORD that requires medical assessment and possibly a longer course under GP supervision.

Long-term use of PPIs is possible under medical guidance, but your GP should review your treatment regularly to ensure it remains necessary and appropriate. Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

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What Are the Most Common Side Effects of Esomeprazole 20mg?

Most people tolerate esomeprazole 20mg well, but like all medicines, it can cause side effects in some people. Common side effects affect up to 1 in 10 people and are usually mild and short-lived. They often improve as your body adjusts to the medicine during the first few days of treatment.

  • Headache
  • Diarrhoea
  • Nausea or feeling sick
  • Stomach pain or abdominal discomfort
  • Flatulence (wind)
  • Constipation

What Are the Less Common Side Effects of Esomeprazole 20mg?

Less common side effects affect up to 1 in 100 people. These are not experienced by most users, but it is worth being aware of them so you can recognise them if they occur. If any of the following persist or become troublesome, speak to your pharmacist or GP.

  • Dizziness or drowsiness
  • Dry mouth
  • Skin rash, itching, or hives
  • Swelling of the feet or ankles
  • Disturbed sleep or insomnia
  • Blurred vision
  • Low sodium levels (hyponatraemia) — symptoms include confusion and muscle weakness

What Are the Serious Side Effects of Esomeprazole 20mg?

Serious side effects are rare but require immediate medical attention. Stop taking esomeprazole and call 999 or go to your nearest A&E if you experience signs of a severe allergic reaction, including difficulty breathing, swelling of the face, lips, tongue, or throat, or a widespread skin rash. Long-term use of PPIs has also been associated with a small increased risk of bone fractures (particularly of the hip, wrist, or spine), low magnesium levels (hypomagnesaemia), and Clostridium difficile-associated diarrhoea. If you develop severe or persistent diarrhoea during or after treatment, seek medical advice promptly.

What Should You Do If You Experience Side Effects of Esomeprazole 20mg?

For mild side effects such as headache or nausea, staying well hydrated and taking the tablet before food can help. Most mild effects resolve within a few days without any intervention. If a side effect is bothering you or does not improve, stop taking the tablet and speak to your pharmacist — they can advise whether you should continue, switch to an alternative, or see your GP. You can also report suspected side effects directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk.

Can Esomeprazole 20mg Interact With Other Medicines?

Yes — esomeprazole can interact with a number of commonly used medicines, which may reduce the effectiveness of either drug or increase the risk of side effects. Always inform your pharmacist or GP of all medicines you are currently taking, including over-the-counter products, supplements, and herbal remedies. Key interactions to be aware of include:

  • Clopidogrel — esomeprazole may reduce its antiplatelet effect
  • Methotrexate — esomeprazole may increase methotrexate levels in the blood
  • Ketoconazole or itraconazole — reduced absorption of these antifungals
  • Atazanavir or nelfinavir — esomeprazole significantly reduces their absorption; co-administration is contraindicated
  • Warfarin — possible increased anticoagulant effect; INR monitoring may be needed
  • Digoxin — esomeprazole may increase digoxin levels slightly

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Frequently Asked Question


It is used to treat acid reflux, GORD, heartburn, and to help heal acid-related stomach or oesophageal irritation.


Most people feel relief within a few hours, but full effect may take 2–3 days of continuous use.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

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What is Esomeprazole 20mg used for?


It is used to treat acid reflux, GORD, heartburn, and to help heal acid-related stomach or oesophageal irritation.

How long does Esomeprazole take to work?


Most people feel relief within a few hours, but full effect may take 2–3 days of continuous use.