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Losec MUPS 20mg Tablets

Losec MUPS 20mg Tablets

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What Is Losec MUPS 20mg and How Does It Help?

 

Losec MUPS 20mg tablets contain omeprazole, a well-established proton pump inhibitor (PPI) used to reduce excess stomach acid. If you've ever felt that burning sensation creeping up your chest after a meal, or woken in the night with a sour taste in your throat, you'll know how disruptive acid reflux can be. Losec MUPS offers targeted, clinically proven relief for exactly these kinds of symptoms. You can explore our full range of indigestion treatments if you're looking for additional digestive support alongside this product.

The "MUPS" in the name stands for Multiple Unit Pellet System — a tablet formulation that contains hundreds of tiny gastro-resistant pellets. This design means the tablet can be swallowed whole or dispersed in water, making it particularly useful for people who find standard capsules difficult to take. It's a practical difference that matters more than you might think.

 

How Does Losec MUPS Work to Reduce Stomach Acid?

 

Omeprazole works by targeting the root cause of excess acid production rather than simply neutralising acid after it's already formed. Here's how the mechanism unfolds:

  • Omeprazole is absorbed into the bloodstream and travels to the parietal cells lining your stomach wall.
  • It irreversibly inhibits the hydrogen-potassium ATPase enzyme — often called the "proton pump" — which is responsible for secreting acid into the stomach.
  • By blocking this pump, omeprazole significantly reduces the volume and concentration of gastric acid produced.
  • The gastro-resistant pellets within each MUPS tablet protect the omeprazole from being broken down by stomach acid before it reaches the small intestine, where it is absorbed.

This mechanism means relief builds over the first few days of treatment, with maximum acid suppression typically achieved after three to five days of regular use.

 

Who Is Losec MUPS 20mg Suitable For?

 

Losec MUPS 20mg is suitable for adults aged 18 and over who experience symptoms related to excess stomach acid. It's particularly well-suited to people who need a reliable, once-daily option they can take consistently. That said, it isn't right for everyone — always read the label and check with your pharmacist if you're unsure.

  • Adults with frequent heartburn or acid reflux (two or more days per week)
  • People diagnosed with gastro-oesophageal reflux disease (GORD/GERD)
  • Those with a confirmed peptic or duodenal ulcer (under medical supervision)
  • Individuals who struggle to swallow capsules and need a dispersible tablet option

 

How Does Losec MUPS Compare to Standard Omeprazole Capsules?

 

Feature Losec MUPS 20mg Standard Omeprazole Capsules
Formulation Gastro-resistant MUPS tablet Gastro-resistant capsule
Can be dispersed in water? Yes — pellets disperse easily No — capsule must be swallowed whole
Active ingredient Omeprazole 20mg Omeprazole 20mg
Suitable for swallowing difficulties? Yes Generally no

 

How Should You Store Losec MUPS 20mg Tablets?

 

Store your Losec MUPS 20mg tablets below 25°C in a dry place, away from direct sunlight and moisture. Keep them in the original packaging until you're ready to use them. Do not store them in the bathroom, where humidity can affect the integrity of the gastro-resistant pellets. Always keep medicines out of the reach and sight of children. If you're managing multiple health conditions and need support with other areas of your wellbeing, our vitamins and supplements collection may be worth exploring alongside your treatment.

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.

Losec MUPS 20mg Tablets specifications
Treatment category Acid reflux, heartburn, GORD, peptic ulcer
Mechanism of action Proton pump inhibitor (PPI) — inhibits gastric acid secretion
Effective for Heartburn, acid reflux, GERD, gastric and duodenal ulcers
Suitable for Adults aged 18 and over
Active ingredient Omeprazole 20mg
Pack sizes 7 tablets, 14 tablets, 28 tablets
Strengths 20mg
UK classification P (Pharmacy medicine)
Drug class Proton pump inhibitor (PPI)
Preparation Gastro-resistant MUPS tablet
Route of administration Oral

Specifications of Losec MUPS 20mg Tablets

 

What Is Losec MUPS 20mg and What Is It Used For?

 

Losec MUPS 20mg tablets contain omeprazole, a proton pump inhibitor (PPI) licensed for the short-term treatment of acid-related conditions in adults. It is used to relieve the symptoms of heartburn, acid reflux, and gastro-oesophageal reflux disease (GORD). It may also be used to treat and prevent gastric and duodenal ulcers, including those caused by long-term use of non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen. In some cases, it is used as part of combination therapy to eradicate Helicobacter pylori infection. If you're also experiencing cramping or bowel discomfort alongside your reflux, our IBS and cramps range may offer complementary support.

 

What Do You Need to Know Before Using Losec MUPS 20mg?

 

Before taking this medicine, it's important to be aware of the following contraindications and warnings:

  • Do not take if you are allergic to omeprazole, any other PPI (such as lansoprazole or pantoprazole), or any of the tablet's excipients.
  • Do not take alongside nelfinavir (an HIV medicine).
  • Tell your doctor or pharmacist if you have liver disease, as your dose may need to be adjusted.
  • If you are pregnant or breastfeeding, seek medical advice before use — omeprazole should only be used in pregnancy when clearly necessary.
  • Do not use for more than 14 days without speaking to a doctor. Persistent symptoms may indicate a more serious underlying condition.
  • Long-term use of PPIs has been associated with low magnesium levels (hypomagnesaemia) and an increased risk of bone fractures — your doctor will monitor this if you are on prolonged therapy.
  • Losec MUPS tablets contain sucrose. If you have been told you have an intolerance to some sugars, speak to your doctor before taking this medicine.

The following medicines may interact with omeprazole:

  • Clopidogrel (antiplatelet agent) — omeprazole may reduce its effectiveness
  • Methotrexate — omeprazole may increase methotrexate levels in the blood
  • Warfarin and other anticoagulants — increased monitoring may be required
  • Ketoconazole, itraconazole, and posaconazole — absorption may be reduced
  • HIV antiretrovirals such as atazanavir and saquinavir
  • Digoxin — plasma levels may increase slightly

 

How Should You Use Losec MUPS 20mg Tablets?

 

Always use this medicine exactly as directed on the label or as advised by your pharmacist or doctor. The standard course for over-the-counter use is up to 14 days. If your symptoms do not improve within that time, stop taking the tablets and consult your GP.

  1. Take one tablet once daily, preferably 30 to 60 minutes before your first meal of the day.
  2. Swallow the tablet whole with a glass of water — do not crush or chew it.
  3. If you have difficulty swallowing, dissolve the tablet in half a glass of still water (not carbonated), stir until the pellets disperse, and drink immediately. Do not use milk or other liquids.
  4. If any residue remains in the glass, add a little more water, stir, and drink that too.
  5. Continue taking the tablet at the same time each day for the full recommended course.
Indication Age Group Dose Duration
Heartburn / acid reflux (OTC) Adults 18+ 20mg once daily Up to 14 days
GORD (prescribed) Adults 18+ 20mg once daily 4–8 weeks (as directed)
Gastric/duodenal ulcer (prescribed) Adults 18+ 20–40mg once daily 4–8 weeks (as directed)

 

What Are the Possible Side Effects of Losec MUPS 20mg?

 

Like all medicines, omeprazole can cause side effects, although not everyone gets them. Most are mild and resolve on their own. If you experience anything that concerns you, speak to your pharmacist or GP.

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

  • Headache
  • Nausea or vomiting
  • Diarrhoea or constipation
  • Stomach pain or discomfort
  • Flatulence (wind)

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

  • Dizziness or drowsiness
  • Dry mouth or altered taste
  • Skin rash or itching
  • Swelling of the feet or ankles
  • Raised liver enzymes (detected on blood tests)

Rarely, omeprazole can cause serious reactions including severe allergic responses (anaphylaxis), low blood sodium or magnesium, or visual disturbances. Seek immediate medical attention if you experience difficulty breathing, swelling of the face or throat, or a severe skin reaction. If you're managing pain alongside your acid reflux — for example, from an NSAID-related ulcer — our pain relief collection may be helpful to browse with your pharmacist's guidance.

 

How Should You Store Losec MUPS 20mg Tablets?

 

  • Store below 25°C in a dry place, away from direct sunlight and heat sources.
  • Keep in the original blister packaging until ready to use.
  • Do not store in the bathroom or near a sink — moisture can degrade the gastro-resistant coating on the pellets.
  • Keep out of the reach and sight of children at all times.
  • Do not use after the expiry date printed on the packaging.
  • Do not dispose of medicines via wastewater or household waste — return unused tablets to your pharmacy for safe disposal.

Written and reviewed by our qualified team

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 Losec MUPS 20mg online in the UK?

You can buy Losec MUPS 20mg tablets directly from Cured Pharmacy, a GPhC-registered online pharmacy operating in the UK. Simply add the product to your basket and complete a brief health questionnaire before checkout. We dispatch orders quickly so you can start treatment without delay. You can also browse our wider indigestion treatments collection for related products.

How does Losec MUPS 20mg work in the body?

Losec MUPS 20mg contains omeprazole, which belongs to a class of medicines called proton pump inhibitors (PPIs). It works by irreversibly blocking the hydrogen-potassium ATPase enzyme — the "proton pump" — in the cells lining your stomach wall, which dramatically reduces the amount of acid your stomach produces. This gives the oesophagus and stomach lining a chance to heal and relieves symptoms like heartburn and regurgitation. Effects build gradually, with full acid suppression typically reached after three to five days of daily use.

How do I take Losec MUPS 20mg tablets step by step?

Take one tablet once daily, ideally 30 to 60 minutes before your first meal. You can swallow it whole with a glass of water, or if you have difficulty swallowing, dissolve it in half a glass of still water, stir until the pellets disperse, and drink immediately. Never crush or chew the tablet, as this damages the gastro-resistant coating on the pellets and reduces effectiveness.

What is the correct dose of Losec MUPS 20mg for heartburn?

For over-the-counter use in adults aged 18 and over, the recommended dose is one 20mg tablet once daily for up to 14 days. Do not take more than one tablet per day unless a doctor has specifically advised a higher dose for a diagnosed condition such as GORD or a peptic ulcer. If your symptoms have not improved after 14 days, stop taking the tablets and consult your GP, as further investigation may be needed.

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

The best time to take Losec MUPS 20mg is in the morning, approximately 30 to 60 minutes before breakfast. Taking it before eating allows the omeprazole to be absorbed and reach the proton pumps while they are most active — which happens when you start eating. Consistency matters too, so try to take it at the same time each day throughout your course of treatment.

What are the side effects of Losec MUPS 20mg and how do I manage them?

The most common side effects include headache, nausea, diarrhoea, stomach pain, and flatulence — these affect up to 1 in 10 people and are usually mild. Staying well hydrated and taking the tablet before food can help reduce stomach-related side effects. If you experience a severe skin reaction, difficulty breathing, or swelling of the face or throat, stop taking the medicine immediately and seek urgent medical attention, as these may indicate a rare but serious allergic reaction.

Who should not take Losec MUPS 20mg tablets?

Do not take Losec MUPS 20mg if you are allergic to omeprazole, any other proton pump inhibitor (such as lansoprazole, pantoprazole, or esomeprazole), or any ingredient in the tablet. It should not be taken alongside nelfinavir (an HIV medicine). People with severe liver disease, those who are pregnant or breastfeeding, and children under 18 should seek medical advice before use. Always check with your pharmacist if you are unsure whether this medicine is right for you.

What happens if I miss a dose of Losec MUPS 20mg?

If you forget to take a dose, take it as soon as you remember — but only if it is not nearly time for your next scheduled dose. If it is close to your next dose time, simply skip the missed dose and carry on as normal. Never take two tablets at once to compensate for a missed dose, as this will not improve your symptoms faster and may increase the risk of side effects.

How is Losec MUPS different from standard omeprazole capsules?

The key difference lies in the formulation. Losec MUPS uses Multiple Unit Pellet System technology, meaning each tablet contains hundreds of tiny gastro-resistant pellets rather than a single large unit inside a capsule shell. This allows the tablet to be dispersed in water — making it a practical option for people who struggle to swallow capsules. The active ingredient, omeprazole 20mg, is identical in both formulations, so the clinical effect is the same.

Can I take Losec MUPS 20mg with other medicines?

Omeprazole can interact with several medicines, including clopidogrel, warfarin, methotrexate, ketoconazole, and certain HIV antiretrovirals. These interactions can either reduce the effectiveness of the other medicine or increase the risk of side effects. Always tell your pharmacist or doctor about all medicines, supplements, and herbal remedies you are taking before starting Losec MUPS 20mg.

How long can you take Losec MUPS 20mg for?

For over-the-counter use, Losec MUPS 20mg should not be taken for more than 14 consecutive days without medical supervision. If your symptoms persist beyond this period, you should see your GP, who may investigate further or prescribe a longer course under medical guidance. Long-term PPI use is associated with potential risks including low magnesium levels and reduced bone density, so ongoing treatment should always be reviewed by a healthcare professional.

Is Losec MUPS 20mg suitable during pregnancy or breastfeeding?

Omeprazole should only be used during pregnancy when clearly necessary and under the guidance of a doctor, as data on its safety in pregnancy is limited. It is known to pass into breast milk, so breastfeeding mothers should seek medical advice before taking it. Your GP or midwife can advise on the safest option for managing heartburn during pregnancy, which may include dietary changes or antacids as a first step.

What are the alternatives to Losec MUPS 20mg for acid reflux?

Other PPIs available in the UK include lansoprazole, pantoprazole, and esomeprazole — all of which work in a similar way to omeprazole. H2 receptor antagonists such as famotidine offer a different mechanism and may suit people who need faster, shorter-term relief. Antacids like calcium carbonate or sodium alginate provide immediate but temporary symptom relief. Your pharmacist can help you choose the most appropriate option based on your symptoms and medical history. You can also explore our indigestion treatments for a broader selection.

What does the latest research say about long-term omeprazole use?

Research published in recent years has highlighted that long-term PPI use — typically defined as more than eight weeks — may be associated with an increased risk of hypomagnesaemia (low magnesium), vitamin B12 deficiency, Clostridioides difficile infection, and a modest increase in fracture risk. The NHS and MHRA recommend that PPIs should be used at the lowest effective dose for the shortest necessary duration. If you are on long-term therapy, your GP should review your treatment periodically to assess whether it is still needed.

Can lifestyle changes help alongside taking Losec MUPS 20mg?

Yes — lifestyle modifications can significantly reduce the frequency and severity of acid reflux symptoms alongside medication. The NHS recommends eating smaller, more frequent meals, avoiding trigger foods such as fatty or spicy dishes, not lying down within three hours of eating, raising the head of your bed slightly, and maintaining a healthy weight. Reducing alcohol intake and stopping smoking can also make a meaningful difference. These changes work best when combined with appropriate medical treatment rather than used as a replacement for it. Our vitamins and supplements range may also support your overall digestive health.

How Should You Use Losec MUPS 20mg Tablets?

Using Losec MUPS 20mg correctly makes a real difference to how well it works. The gastro-resistant pellets inside each tablet are designed to pass through the stomach intact and dissolve in the small intestine, so it's important not to interfere with that process by crushing or chewing.

Do not use fruit juice, milk, or carbonated drinks to disperse the tablet, as these may affect the integrity of the gastro-resistant pellets.

What Is the Correct Dose of Losec MUPS 20mg?

The dose you need depends on what you are treating. For over-the-counter use, adults aged 18 and over should take one 20mg tablet once daily. Always follow the guidance on the label or as directed by your pharmacist or doctor — do not self-escalate your dose.

When Is the Best Time to Use Losec MUPS 20mg?

The most effective time to take Losec MUPS 20mg is in the morning, around 30 to 60 minutes before breakfast. Proton pumps are most active when stimulated by food, so taking omeprazole before your first meal of the day ensures it is working at its peak when you need it most. Try to take it at the same time each day to maintain consistent acid suppression throughout your course of treatment.

If you are taking it twice daily under medical supervision, take the second dose in the evening before your evening meal, not at bedtime.

How Long Can You Use Losec MUPS 20mg For?

For over-the-counter use, Losec MUPS 20mg should not be taken for more than 14 consecutive days without speaking to a doctor. If your symptoms return after completing a course, or if they have not improved within 14 days, you should seek medical advice rather than starting another course independently. Longer-term use is sometimes appropriate under medical supervision — for example, for GORD or ulcer prevention — but this should always be reviewed regularly by your GP.

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 Losec MUPS 20mg?

Most people who take Losec MUPS 20mg tolerate it 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 generally mild and short-lived. They often improve as your body adjusts to the medicine.

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

What Are the Less Common Side Effects of Losec MUPS 20mg?

Less common side effects affect up to 1 in 100 people. These are not usually serious, but you should mention them to your pharmacist or GP if they persist or bother you.

  • Dizziness or drowsiness
  • Dry mouth or altered sense of taste
  • Skin rash, itching, or hives
  • Swelling of the feet or ankles
  • Sleep disturbances
  • Raised liver enzymes (usually detected incidentally on blood tests)
  • Tingling or numbness in the hands or feet

What Are the Serious Side Effects of Losec MUPS 20mg?

Serious side effects are rare but require immediate medical attention. Stop taking Losec MUPS 20mg and seek urgent help if you experience any of the following:

  • Severe allergic reaction (anaphylaxis) — symptoms include difficulty breathing, swelling of the face, lips, tongue, or throat, and a sudden drop in blood pressure
  • Severe skin reactions such as Stevens-Johnson syndrome — characterised by blistering, peeling skin, and mouth sores
  • Symptoms of low magnesium (hypomagnesaemia) — muscle spasms, irregular heartbeat, tremors, or seizures
  • Signs of Clostridioides difficile infection — severe, persistent watery diarrhoea, especially if you are elderly or have recently taken antibiotics
  • Unexplained weight loss, difficulty swallowing, or vomiting blood — these may indicate a more serious underlying condition and require urgent investigation

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

For mild side effects, continue taking the medicine and speak to your pharmacist at your next opportunity. Staying well hydrated and taking the tablet before food can help reduce stomach-related discomfort. If a side effect is severe, persistent, or worrying you, stop taking the medicine and contact your GP. You can also report side effects directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk.

Can Losec MUPS 20mg Interact With Other Medicines?

Yes — omeprazole is known to interact with several medicines. It can reduce the antiplatelet effect of clopidogrel, potentially increasing cardiovascular risk. It may raise blood levels of methotrexate, increasing toxicity risk. Omeprazole can also affect the absorption of medicines that depend on stomach acid, such as ketoconazole, itraconazole, and some HIV antiretrovirals. Warfarin levels may be affected, requiring closer INR monitoring. Always tell your pharmacist or doctor about every medicine, supplement, or herbal remedy you are taking before starting this treatment.

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

Frequently Asked Question


They work the same, but the MUPS pellets dissolve more evenly, which some people prefer if they struggle with swallowing tablets.

People who:

  • Get heartburn regularly
  • Wake up with acid in their throat
  • Have reflux triggered by foods (spicy, fried, late-night meals)
  • Have been diagnosed with ulcers
  • Are on long-term medications that irritate the stomach
  • Want more reliable relief than antacids

If you’re someone who’s tired of burning chest sensations ruining your meals, this type of medication genuinely makes life easier.


Yes, but space them out at least 2 hours apart.

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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Do Losec MUPS tablets work better than normal omeprazole?


They work the same, but the MUPS pellets dissolve more evenly, which some people prefer if they struggle with swallowing tablets.

Who Usually Benefits from Losec MUPS 20mg?

People who:

  • Get heartburn regularly
  • Wake up with acid in their throat
  • Have reflux triggered by foods (spicy, fried, late-night meals)
  • Have been diagnosed with ulcers
  • Are on long-term medications that irritate the stomach
  • Want more reliable relief than antacids

If you’re someone who’s tired of burning chest sensations ruining your meals, this type of medication genuinely makes life easier.

Can I take antacids with it?


Yes, but space them out at least 2 hours apart.