Omeprazole (Generic Losec) Capsules

Based on 49 reviews

Available in 14 and 28 capsules

  • Treatment for heartburn, indigestion and GORD
  • Generic alternative of Losec
  • Can also be used to treat stomach ulcers
  • Always read the patient information leaflet before use
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Buy omeprazole capsules online

Omeprazole is a medication that can be used to treat symptoms of gastro-oesophagal reflux disease or GORD. It can help to manage the long-term effects of acid reflux and heartburn caused by an excess of stomach acid, which is common in patients with GORD or stomach ulcers. Available in 10mg, 20mg and 40mg capsules, omeprazole can often treat or prevent your symptoms with just one dose a day.


How omeprazole treats acid reflux

Omeprazole is a type of medication called a proton pump inhibitor or PPI. These medications work by reducing the amount of stomach acid you produce, making it less likely that excess stomach acid will travel up your food pipe. This prevents symptoms of GORD, including acid reflux and heartburn, by tackling the cause of your discomfort directly.

GORD patients can also experience damage to their food pipe as a result of acid reflux, and this can be difficult to heal without managing further bouts of reflux. By reducing your stomach acid, omeprazole prevents further damage to your food pipe, giving the damage time to heal.



Your dosage of omeprazole and the length of your treatment will be determined by your prescriber during your consultation. This medication can be used for different conditions, including GORD and stomach ulcers, and the recommended dosage will change depending on your condition. The dosages recommended for adults by the manufacturer are as follows:


Condition Dosage Duration of Treatment
Symptoms of GORD (e.g. heartburn, acid reflux) 20mg once a day if the food pipe has been damaged. 10mg once a day if the food pipe has not been damaged or has healed. 4 - 8 weeks
Ulcers in the upper part of the intestine (duodenal ulcers) 20mg once a day 2 - 4 weeks
Stomach ulcers 20mg once a day 4 weeks
Prevention of stomach or duodenal ulcers 10 - 20mg once a day As recommended by prescriber
Stomach or duodenal ulcers caused by NSAIDs 20mg once a day 4 - 8 weeks
Prevention of stomach or duodenal ulcers caused by NSAIDs 20mg once a day As recommended by prescriber
Ulcers caused by H. pylori 20mg twice a day 1 week
Stomach acid caused by a growth in the pancreas (Zollinger-Ellison syndrome) 60mg a day As recommended by prescriber


Children and Adolescents

Children and teenagers can take omeprazole to manage symptoms of GORD or stomach ulcers caused by H. pylori. The dosage given to your child will vary depending on their age and weight and the condition being treated.


Suitable Age of Patient Condition Dosage Duration of Treatment
Children over 1 year of age who weigh more than 10kg Symptoms of GORD (e.g. heartburn, acid reflux) Determined by the prescriber after considering the child's age and weight. As recommended by prescriber.
Children over 4 years of age Ulcers caused by H. pylori Determined by the prescriber after considering the child's age and weight. As recommended by prescriber.


Side Effects

Like all medications, omeprazole can have side effects, although not everyone will experience them. The most common side effects of this medication include:

  • Headaches
  • Effects on the stomach or gut, e.g. diarrhoea, constipation, wind, stomach pain
  • Feeling sick or being sick
  • Benign polyps in the stomach
  • Swelling of the feet and ankles
  • Disturbed sleep or insomnia
  • Dizziness, sleepiness, a tingling sensation such as "pins and needles"
  • Spinning feeling or vertigo
  • Changes in blood tests that check how your liver is working
  • Skin rash, hives, and itchy skin
  • Feeling generally unwell, lacking energy
  • Fractures in the hip, wrist, or spine

If you experience these or any other side effects while taking this product you should speak to your doctor or pharmacist as soon as possible. For a complete list of side effects please see the patient information leaflet included with your medication.


Serious side effects

If you experience any of the following serious side effects while taking omeprazole you should stop taking this medication and seek immediate medical assistance from your local A&E department or by calling 999 if necessary.

  • Symptoms of a severe allergic reaction, e.g. swelling of the lips, tongue, mouth, throat, or body, an itchy skin rash or hives, difficulty breathing or swallowing, fainting or feeling faint
  • Symptoms of Stevens-Johnson syndrome or toxic epidermal necrolysis, e.g. reddening of the skin with blisters or peeling, severe blisters and bleeding in the lips, eyes, mouth, nose, or genitals
  • Symptoms of liver problems, e.g. yellowing of the skin or whites of the eyes, dark-coloured urine, tiredness



Do not take this medication if you are allergic to omeprazole, any of the other ingredients included in this medication, or any other proton pump inhibitors (e.g. lansoprazole, esomeprazole). Speak to your doctor or pharmacist before taking this treatment if you:

  • Lose a lot of weight for no reason and have problems swallowing
  • Get stomach pain or indigestion
  • Begin to vomit food or blood
  • Pass black or blood-stained poo
  • Get persistent or severe diarrhoea
  • Have severe liver problems
  • Are due to have a blood test
  • Have ever had a skin reaction after taking similar medications


Pregnancy and breastfeeding

If you are pregnant or breastfeeding you should speak to your doctor or pharmacist before taking omeprazole. This medication is secreted in breastmilk but it is unlikely to affect your child when you're taking it at the recommended dose.


Driving or using machinery

Omeprazole is unlikely to affect your ability to drive or use machinery, however, there are some potential side effects that could affect your vision or judgement. If you experience any dizziness, changes to your vision (for example, blurred vision), or any other side effects that could affect your judgement, you should not attempt to drive or use machinery until you are absolutely sure that these symptoms have passed.



You can take this medication with food or on an empty stomach. Omeprazole capsules contain sucrose, so you should speak to your doctor before taking this medication if you have an intolerance to some sugars.


Other medications

You should not take omeprazole if you are already taking nelfinavir, which is a medication used for HIV infections. Speak to your doctor or pharmacist before taking this product if you are already taking:

  • Ketoconazole, itraconazole, posaconazole or voriconazole, which are used to treat fungal infections
  • Digoxin, which is used to treat heart problems
  • Diazepam, a medication for anxiety, relaxing muscles, or used in epilepsy
  • Phenytoin, which is used in epilepsy
  • Blood thinners, such as warfarin
  • Rifampicin, which is used to treat tuberculosis
  • Atazanavir, which is used to treat HIV
  • Tacrolimus, which is used in cases of organ transplantation
  • St John's Wort, which is used for mild depression
  • Cilostazol, which is used to treat intermittent claudication
  • Saquinavir, which is used to treat HIV
  • Clopidogrel, which is used to prevent blood clots
  • Erlotinib, which is used to treat cancer
  • Methotrexate, which is a chemotherapy medicine
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Omeprazole (Generic Losec) Capsules Reviews

Neil Doolan,
Product works perfectly
Nicola Martin,
I suffer from acid reflux and these do seem to help, just one a day usually in the morning works a treat
Tina Crocker,
Full contents
I've had these 10yrs
Mrs Sheila Brinklow,
Very good. Really helps.

Advice & Guides

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Frequently Asked Questions

Heartburn is a symptom of acid reflux. It occurs when acid produced by the stomach travels up towards the throat and causes a burning sensation in the middle of your chest.

You may also experience a cough, hiccups, bad breath and nausea when suffering from acid reflux.

Although acid reflux is not a serious condition it may be a symptom of gastro-oesophageal reflux disease (GORD), a long-term form of acid reflux.

If you often experience heartburn and acid reflux it is recommended that you seek advice from your doctor, as they will be able to prescribe a medicine known as a proton pump inhibitor (usually either omeprazole or lansoprazole) which can help to reduce the amount of stomach acid that is produced by your stomach.

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You do need a prescription for this medication in the UK.

Our healthcare professionals can provide prescriptions if they think this treatment would be right for you and your condition.

When you click the button which reads “Start Consultation” at the top of this page, you’ll see a short questionnaire set up by our healthcare team which is designed to help them understand your medical needs.

Just like an in-person consultation with your GP, our doctors will assess your answers to their questions and write a prescription for the treatment they think will be best for you.

You’ll then be able to pay for your medication and we’ll send it out to you quickly and in discreet packaging.

GORD stands for gastro-oesophagal reflux disease and is also known as GERD in American English.

GORD is often recognised as a persistent or prolonged form of acid reflux and can be a severe condition in some patients.

As well as heartburn, some of the most common symptoms of GORD include:

  • An unpleasant taste in the mouth
  • Bad breath
  • Bloating and wind
  • A sore throat
  • Feeling or being sick
  • Pain or difficulty swallowing
  • A persistent cough
  • Tooth decay and gum disease