Prilosec (Omeprazole)

Prilosec
4.86 ratingsReviews
Generic:
Omeprazole
Indications:
gastroesophageal reflux disease heartburn ulcers Zollinger-Ellison syndrome
Analogs:
Nexium
AdultsPregnancyAllergiesDiabetesBreastfeedingChildrenDriving

Dosages

Prilosec 10 mg

Quantity Price per capsule You save Total price
90 £0.74 - £66.67
120 £0.69 £5.93 £82.97
180 £0.66 £14.82 £118.53
270 £0.63 £28.89 £171.12
360 £0.62 £43.71 £222.98

Prilosec 20 mg

Quantity Price per capsule You save Total price
60 £0.95 - £57.04
90 £0.81 £12.22 £73.34
120 £0.75 £23.71 £90.38
180 £0.70 £45.93 £125.20
270 £0.65 £80.38 £176.31
360 £0.63 £116.31 £225.94

Prilosec 40 mg

Quantity Price per capsule You save Total price
30 £2.15 - £64.45
60 £1.49 £39.26 £89.64
90 £1.30 £76.30 £117.05
120 £1.19 £115.56 £142.23
180 £1.07 £193.35 £193.35
270 £1.01 £307.43 £272.61
360 £0.98 £422.26 £351.14

Manufacturers

ApotexAstraZenecaDr. Reddy's Laboratories Ltd.HexalLaboratorios CinfaMalesci Istituto FarmacobiologicoRanbaxy Laboratories Ltd.ratiopharm

Payment & Delivery

Package Example

Your order is securely packed and usually dispatched within 24 hours. Here is what a typical parcel looks like.

It is about the size of a regular letter (24x11x0.7 cm) and does not show any details of what is inside.

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Delivery Times
Delivery MethodEstimated delivery
Express Free for orders over £222.24Estimated delivery to the UK: 4-7 days
Standard Free for orders over £148.16Estimated delivery to the UK: 14-21 days
EMSRoyal Mail
Payment Methods
VisaMastercardAmerican ExpressJCBBitcoin, USDTApple PayGoogle PayPayPalKlarnaClearpay

Discount Coupons

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  • Boxing Day - 26 December 2026 10% BOXING10
  • New Year's Eve - 31 December 2026 8% NYE8

Brand Names

Also known as (by country):
CountryBrand Names
United Kingdom
Losec
Australia
Losec
New Zealand
Losec Omezol
Canada
APO-Omeprazole Losec

FAQ

Take unused or expired capsules to a pharmacy or another authorised medicine take-back service where available. Do not flush them down the toilet or sink. Keep them in their original container until disposal, out of the reach of children.

The exact manufacturer for a particular order is not confirmed in advance and may vary. Check the manufacturer's name on the received box or container label, together with the active ingredient, strength, dosage form, batch number and expiry date.

Do not take the capsules until the discrepancy has been checked. Compare the omeprazole strength on the label with your order and contact customer service within 7 days of delivery; a replacement or full refund can be arranged.

The available delayed-release capsule strengths are 10 mg, 20 mg and 40 mg. The appropriate strength depends on the condition being treated and the treatment plan.

Omeprazole is a proton pump inhibitor used to reduce stomach acid. It is used for heartburn and gastro-oesophageal reflux disease, stomach and duodenal ulcers, as part of Helicobacter pylori eradication treatment, and conditions that cause excessive acid production, including Zollinger-Ellison syndrome.

Omeprazole can be used during pregnancy when clinically needed; available pregnancy data have not shown harmful effects on the developing baby. It passes into breast milk in small amounts, but effects on a breastfed child are unlikely at therapeutic doses, so it can also be used while breastfeeding.

Description

A proton pump inhibitor called Prilosec reduces the quantity of acid the stomach produces. Prilosec is used to treat problems brought on by an excess of stomach acid, such as symptoms of gastroesophageal reflux disease (GERD). Additionally, omeprazole, the active ingredient of Prilosec, is used to aid in the recovery of erosive esophagitis, which is an acid reflux disease that damages the esophagus.

When treating a gastrointestinal ulcer brought on by a Helicobacter pylori infection, Prilosec may also be administered in addition to antibiotics.

Over-the-counter Prilosec can manage heartburn that happens two or more days a week. Prilosec OTC is to be taken as a regimen for a consecutive 14 days.

How Does It Work?

Prilosec suppresses the stomach's production of hydrochloric acid by acting as an inhibitor of the "proton pump"-the mechanism that exchanges hydrogen ions. The mechanism of antisecretory activity is linked to the inhibition (suppression) of the gastric mucosa cell membranes' H-K-ATPase enzyme, which speeds up the exchange of hydrogen ions and blocks the last step of hydrochloric acid generation. Consequently, independent of the stimulus type, it lowers the basal (own) level and stimulates secretion (secretion of digestive juices).

Your doctor may prescribe this medication for different reasons. If you would like additional information on this medication, contact your doctor.

Even if you see improvements in your health, don't stop taking Prilosec earlier than your doctor has suggested. If you stop taking the drug too soon, it could make things worse. Until you know how this drug affects you, take caution when operating machinery, driving, climbing, or performing other risky actions. Avoid consuming alcohol.

Prilosec14tabs

Before Treatment 

Early signs of a heart attack can be confused with heartburn. If you feel dizzy or overheated and your chest pain radiates to your shoulder or jaw, get emergency medical attention.

Use of Prilosec is not advised in the following cases:

  • if you have an omeprazole allergy or if you have an allergy to medications that are similar to omeprazole, including Protonix, Nexium, Prevacid, Lansoprazole, Pantoprazole, and Rabeprazole; 
  • you've previously taken omeprazole and experienced respiratory issues, renal issues, or a severe allergic reaction; 
  • you use rilpivirine-containing HIV medications (Complia, Edurant, Odefsey, Juluca). 

Find out from a physician or pharmacist if using this medication is safe if you have the following: 

  • difficulty or pain during swallowing;
  • black or bloody stools, vomit that resembles coffee grounds or blood; 
  • heartburn persisting for more than three months; 
  • regular heartburn and wheezing, chest pain; 
  • rapid weight loss; 
  • nausea, vomiting, and abdominal pain;
  • hepatic illness; 
  • inadequate blood magnesium levels; 
  • decreased bone mineral density, often known as osteoporosis (osteopenia). 

When using a proton pump inhibitor for an extended period or more than once a day, you run the risk of breaking a bone in your hip, wrist, or spine. Consult your physician about maintaining the health of your bones. 

Proton pump inhibitor (PPI) acid-suppressing medications, including omeprazole, have been linked to a higher risk of stomach cancer, commonly known as gastric cancer when used long-term. Based on the findings of multiple observational studies, it is believed that PPIs, like omeprazole, are strong gastric acid suppressants that may raise the risk of gastric cancer by thinning the stomach lining, increasing the hormone gastrin levels, and encouraging the growth of bacteria in the stomach.

Consult a physician before using this medication if you are nursing a baby or pregnant.

How Should Prilosec Be Taken? 

Adhere strictly to the label's instructions or your doctor's prescription when using Prilosec. Read all drug guides or instruction sheets and abide by all guidelines on the label of your medicine.

If you are unable to take the entire contents, open the capsule and sprinkle the medication into a spoonful of applesauce. Immediately swallow the mixture. Don't keep it for later.

The powdered Prilosec needs to be dissolved in a tiny amount of water. This combination can be administered with a catheter-tipped syringe via a nasogastric (NG) feeding tube or by swallowing it. 

Take OTC Prilosec no more than 14 days in a row. It could take one to four days for your symptoms to get better. Before you begin a fresh 14-day round of treatment, give yourself at least 4 months. 

If your symptoms worsen or do not improve, call your doctor. 

Antibiotics and Prilosec are used in conjunction to treat certain illnesses. Take all prescriptions exactly as prescribed.

This medication may influence certain medical test results. Inform every medical professional you see that you take Prilosec. 

Prilosec42tabs

Adverse Effects of Prilosec

If you have any of the following symptoms of a Prilosec allergic reaction: hives, trouble breathing, or swelling in your face, lips, tongue, or throat, get emergency medical attention.

Call your doctor and cease taking Prilosec if you have: 

  • acute stomach ache, bloody or watery diarrhea; 
  • unexpected or fresh back, hip, thigh, or wrist pain; 
  • seizure (fits and fits); 
  • kidney problems: fever, rash, nausea, appetite loss, joint discomfort, decreased frequency of urination, blood in the urine, weight gain;
  • low magnesium - jitteriness, cramps, spasms in the muscles, feeling like you're choking, or experiencing dizziness;
  • joint pain and a skin rash on your face or arms that worsens in the sun are new or worsening signs of lupus.

Long-term Prilosec use may increase the risk of fundic gland polyps, which are growths in your stomach. Discuss this risk with your physician. 

Over three years of omeprazole use may result in vitamin B-12 insufficiency. If you have this illness, consult your physician about how to treat it. 

Typical Prilosec adverse effects could be: 

  • signs of a cold, including stuffy nose, sneezing, and sore throat (particularly in kids); 
  • fever, particularly in young people; 
  • gas and stomach ache; 
  • vomiting, diarrhea, and nausea; 
  • headache. 

Other adverse effects might also arise; this is not an exhaustive list. For medical advice regarding side effects, contact your physician. 

Which Other Medications Will Impact Prilosec?

There are situations when taking certain drugs with Prilosec is unsafe. Certain drugs can alter the blood levels of other medications you take, which could worsen side effects or reduce their efficacy. 

Inform your physician about every medication you are taking. Omeprazole interacts with several medications, particularly: 

  • digoxin;
  • clopidogrel;
  • methotrexate;
  • St John's Wort;
  • a "water pill" or diuretic;
  • an antibiotic (rifampin, clarithromycin, or amoxicillin). 

Numerous additional medications may interact with omeprazole; this list is not exhaustive. 

Medically reviewed by
John Buducci
Pharmacology expert
Updated 11 August 2026

Customer questions

Asked by Hannah, Southampton, United Kingdom

I live in Southampton and want to check whether these capsules can be delivered to my postcode before I pay. Where can I do that?

Answered by Support team

Enter your Southampton delivery address and postcode during checkout to see the delivery options available for that destination. Availability is confirmed from the options shown there.

Asked by Oliver, Leeds, United Kingdom

My order to Leeds has been marked as dispatched. Does that mean it will arrive tomorrow?

Answered by Support team

Not necessarily. Dispatch means the order has left for delivery, while arrival depends on the delivery service and destination. Check the delivery information provided for your order for the latest expected timing.

Asked by Priya, Stoke-on-Trent, United Kingdom

I may need to reorder these capsules regularly. Will repeat orders come from the same manufacturer?

Answered by Support team

We cannot guarantee that a repeat order will have the same manufacturer. Before using each supply, check the package label for omeprazole, the selected strength, delayed-release capsule dosage form, manufacturer, batch number and expiry date.

Asked by Daisy S, Belfast, United Kingdom

I'm in Belfast. Can I confirm whether delivery to my address in Northern Ireland is available before placing the order?

Answered by Support team

Yes. Add your Belfast address and postcode at checkout to view the delivery options available for your destination before payment. This is the best way to confirm current availability.

Asked by Callum, Glasgow, United Kingdom

I have been taking omeprazole 40 mg for several months for reflux. Is long-term use something I should have reviewed?

Answered by Support team
Medical reviewed by John Buducci

Yes. Long-term proton pump inhibitor treatment should be reviewed periodically to confirm that the dose and duration are still needed. Prolonged use can be associated with problems such as low magnesium or vitamin B12, bone fractures and certain infections, so your prescriber can assess your individual risks and treatment plan.

Product specifications

Active ingredientOmeprazole
Drug classProton pump inhibitor
Dosage formDelayed-release capsule
Available strengths10 mg, 20 mg, 40 mg
RouteOral
StorageStore at 20°C to 25°C in a tightly closed container, protected from light and moisture.
ATC codeA02BC01

Regulatory information

United Kingdom: medicine status
UK registrationA UK marketing authorisation for the exact Prilosec capsule presentation and strengths has not been confirmed; do not assume that the US Prilosec brand is authorised in the UK.
Prescription statusThe prescription classification of this exact Prilosec product in the UK is unknown because a UK-authorised presentation has not been confirmed.
UK patient informationThe NHS provides patient information on omeprazole, including uses, directions for use, adverse effects and precautions.Safety monitoringSuspected side effects from medicines can be reported to the MHRA through the Yellow Card scheme.

More information