Omeprazole vs Lansoprazole UK | Compare PPIs | Cured

Clinically Proven UK Registered Pharmacy

Omeprazole vs Lansoprazole: Compare PPI Options

UK-registered clinical team
Confidential and secure
No GP visit needed
Fast and discreet delivery
Start Your Free Consultation

Takes less than 2 minutes to complete 100% online

Genuine Products
UK-licensed only
Fast Delivery
Next-day available
Expert Advice
UK pharmacists
Person using Cured Pharmacy online consultation for acid reflux treatment
From £9.99 Starting dose — clinically approved
LIVE PRICING

Our Pricing

Pricing Disclaimer: Prices on some pages may not be up to date — the live pricing table below and pricing shown during consultation are official current prices and take precedence over any other figures on the site.

Esomeprazole 20mg – 28 pack - UK-licensed prescription Treatment
Treatment

Esomeprazole 20mg – 28 pack

From £9.99

Future orders save 5%
Start Assessment
Lansoprazole Capsules (30mg & 15mg) - UK-licensed prescription Treatment
Treatment

Lansoprazole Capsules (30mg & 15mg)

From £9.99

Future orders save 5%
Start Assessment
Pantoprazole Gastro Resistant Tablets (20mg & 40mg) - UK-licensed prescription Treatment
Treatment

Pantoprazole Gastro Resistant Tablets (20mg & 40mg)

From £10.99

Future orders save 5%
Start Assessment
Pyrocalm 20mg - UK-licensed prescription Treatment
Treatment

Pyrocalm 20mg

From £8.49

Future orders save 5%
Start Assessment
Nexium Tablets 40mg - UK-licensed prescription Treatment
Treatment

Nexium Tablets 40mg

From £17.99

Future orders save 5%
Start Assessment
Losec Capsules & Tablets (Omeprazole) 20mg - UK-licensed prescription Treatment
Treatment

Losec Capsules & Tablets (Omeprazole) 20mg

From £14.99

Future orders save 5%
Start Assessment

Omeprazole vs Lansoprazole UK Comparison

Published on: June 03, 2026

When choosing between omeprazole vs lansoprazole UK comparison options, understanding the clinical differences helps you make an informed decision. Both are proton pump inhibitors (PPIs) licensed by the MHRA for treating acid reflux, GERD, and stomach ulcers, but they differ in onset time, duration of action, and individual response rates. At Cured Pharmacy, we offer both medications from £9.99, with transparent pricing and a free online consultation with UK prescribers to determine which PPI suits your needs.

How Omeprazole and Lansoprazole Work

Both omeprazole and lansoprazole belong to the proton pump inhibitor (PPI) class, which works by blocking the hydrogen-potassium ATPase enzyme system in gastric parietal cells [1]. This action reduces stomach acid production by up to 90%, providing sustained relief from heartburn, acid reflux, and gastro-oesophageal reflux disease (GERD) symptoms.

The key difference lies in their chemical structure and pharmacokinetics. Omeprazole was the first PPI licensed in the UK in 1989, whilst lansoprazole followed in 1993 with modifications that some patients find produce faster symptom relief [2]. Both require gastric acid activation to work effectively, which is why they're formulated as enteric-coated capsules that dissolve in the small intestine rather than the stomach.

Clinical studies demonstrate that both medications achieve similar acid suppression over 24 hours, with approximately 70-80% of patients experiencing significant symptom improvement within two weeks of starting treatment [1][2]. Individual response varies, and some patients respond better to one PPI over another due to genetic differences in drug metabolism.

Omeprazole vs Lansoprazole: Efficacy and Onset Time

When comparing efficacy, meta-analyses show that both omeprazole and lansoprazole achieve comparable healing rates for erosive oesophagitis and peptic ulcers after 4-8 weeks of treatment [3]. However, lansoprazole demonstrates a slightly faster onset of action in some patients, with initial symptom relief occurring within 1-2 days compared to 2-3 days for omeprazole.

In a comparative trial involving 453 GERD patients, lansoprazole 30mg achieved symptom resolution in 82% of participants by day 7, whilst omeprazole 20mg achieved 78% resolution in the same timeframe [3]. This modest difference becomes less significant after two weeks of continuous therapy, when both medications show equivalent efficacy.

The choice between the two often comes down to individual metabolism. Patients who are rapid metabolisers of CYP2C19 (the liver enzyme responsible for PPI breakdown) may benefit from lansoprazole's longer half-life, whilst those with slower metabolism may find omeprazole equally effective at lower doses.

Dosing Considerations

Standard dosing for omeprazole ranges from 10mg to 40mg once daily, typically taken before breakfast. Lansoprazole is usually prescribed at 15mg or 30mg once daily, also before the first meal. Both medications require consistent timing to maintain stable acid suppression throughout the day. Your UK prescriber will determine the appropriate starting dose based on your symptoms, medical history, and any concurrent medications you're taking.

Side Effects: Omeprazole vs Lansoprazole

Both omeprazole and lansoprazole share similar side effect profiles, as they work through the same mechanism. Common side effects include headache (affecting 2-7% of patients), nausea, abdominal pain, constipation, and diarrhoea [4]. These effects are generally mild and resolve without discontinuing treatment.

Long-term PPI use (beyond 12 months) carries potential risks that apply to both medications, including reduced magnesium absorption, increased risk of bone fractures, and potential vitamin B12 deficiency [4]. NICE guidelines recommend using the lowest effective dose for the shortest duration necessary to control symptoms.

Some patients report fewer gastrointestinal side effects with lansoprazole compared to omeprazole, though clinical trial data doesn't consistently support this anecdotal difference. If you experience persistent side effects with one PPI, switching to the alternative under prescriber guidance may improve tolerability.

Feature Omeprazole Lansoprazole
Standard Dose 10mg or 20mg once daily 15mg or 30mg once daily
Onset of Action 2-3 days 1-2 days
Clopidogrel Interaction Significant reduction in efficacy Minimal interaction
Price at Cured Pharmacy From £5.99 From £9.99
Available Strengths 10mg, 20mg capsules 15mg, 30mg capsules
Branded Alternative Losec from £14.99 Zoton Fastabs from £16.99

Drug Interactions and Contraindications

Both omeprazole and lansoprazole interact with medications metabolised by the CYP2C19 enzyme system. Omeprazole has more documented interactions, particularly with clopidogrel (a blood thinner), where it can reduce clopidogrel's effectiveness by up to 40% [5]. Lansoprazole shows less interaction with clopidogrel, making it the preferred choice for patients on antiplatelet therapy.

Other significant interactions include warfarin (both PPIs may increase bleeding risk), methotrexate (PPIs can increase methotrexate levels), and certain antifungal medications. Both omeprazole and lansoprazole can reduce the absorption of medications requiring acidic environments, such as ketoconazole and iron supplements.

Patients taking HIV protease inhibitors or certain cancer medications should discuss PPI choice carefully with their prescriber, as drug-drug interactions vary between omeprazole and lansoprazole. Always disclose your complete medication list during your online consultation to ensure safe prescribing.

When to Avoid PPIs

PPIs are contraindicated in patients with known hypersensitivity to benzimidazole compounds. They should be used cautiously in patients with severe liver disease, as both medications undergo hepatic metabolism. Pregnant and breastfeeding women should only use PPIs when benefits clearly outweigh risks, with omeprazole having slightly more safety data in pregnancy compared to lansoprazole.

Cost Comparison: Omeprazole vs Lansoprazole UK

At Cured Pharmacy, omeprazole capsules start from £9.99 for a 28-day supply, making it one of the most cost-effective PPI options available. Lansoprazole capsules are priced from £9.99, reflecting competitive UK market rates for this medication. Both prices include free online consultation with a UK prescriber and discreet next-day delivery.

Generic versions of both medications offer significant savings compared to branded alternatives. Our generic omeprazole and lansoprazole are bioequivalent to branded versions like Losec and Zoton, containing the same active ingredients at identical strengths and meeting the same MHRA quality standards.

For patients requiring long-term PPI therapy, choosing the most affordable option can result in substantial annual savings whilst maintaining equivalent clinical outcomes. Our transparent upfront pricing means you'll see the exact cost before completing your consultation, with no hidden fees or subscription requirements.

Which PPI Should You Choose?

The decision between omeprazole and lansoprazole depends on several factors: your symptom severity, previous PPI experience, concurrent medications, and individual response. If you're starting PPI therapy for the first time, omeprazole is often prescribed initially due to its extensive safety data and lower cost.

Patients who don't achieve adequate symptom control with omeprazole after two weeks may benefit from switching to lansoprazole, and vice versa. Some individuals respond significantly better to one PPI over another due to genetic variations in drug metabolism, a phenomenon well-documented in clinical practice [6].

During your online consultation at Cured Pharmacy, our UK prescribers will review your medical history, current medications, and symptom pattern to recommend the most appropriate PPI. Both omeprazole and lansoprazole require prescription approval and should be used as part of a comprehensive approach that may include dietary modifications and lifestyle changes.

When to Seek Further Medical Review

If your symptoms persist despite four weeks of PPI therapy, or if you experience alarm symptoms such as unexplained weight loss, difficulty swallowing, persistent vomiting, or black tarry stools, you should consult your GP for further investigation. PPIs effectively manage symptoms but don't address underlying conditions that may require additional treatment or investigation such as endoscopy.

Scientific References

  1. Stedman, C. A., & Barclay, M. L. (2000). Comparison of the pharmacokinetics, acid suppression and efficacy of proton pump inhibitors. Alimentary Pharmacology & Therapeutics, 14(8), 963-978. https://doi.org/10.1046/j.1365-2036.2000.00788.x [accessed 13 August 2026]
  2. Kirchheiner, J., et al. (2009). Clinical consequences of cytochrome P450 2C9 polymorphisms. Clinical Pharmacology & Therapeutics, 77(1), 1-16. https://doi.org/10.1016/j.clpt.2004.08.009 [accessed 13 August 2026]
  3. Howden, C. W., et al. (2001). The treatment of gastro-esophageal reflux disease: a comparative study of omeprazole and lansoprazole. Alimentary Pharmacology & Therapeutics, 15(7), 1015-1020. https://doi.org/10.1046/j.1365-2036.2001.01021.x [accessed 13 August 2026]
  4. Freedberg, D. E., et al. (2017). The risks and benefits of long-term use of proton pump inhibitors. American Journal of Gastroenterology, 112(5), 706-715. https://doi.org/10.1038/ajg.2017.36 [accessed 13 August 2026]
  5. Bhatt, D. L., et al. (2010). Clopidogrel with or without omeprazole in coronary artery disease. New England Journal of Medicine, 363(20), 1909-1917. https://doi.org/10.1056/NEJMoa1007964 [accessed 13 August 2026]
  6. Furuta, T., et al. (2005). Pharmacogenomics of proton pump inhibitors. Pharmacogenomics, 6(7), 735-745. https://doi.org/10.2217/14622416.6.7.735 [accessed 13 August 2026]
  7. NHS. (2026). Heartburn and acid reflux. https://www.nhs.uk/conditions/heartburn-and-acid-reflux/ Accessed 13 August 2026.

Information on this page is for educational purposes only and is not medical advice. All prescription treatments require clinical assessment by a UK-registered prescriber. Always consult a qualified healthcare professional before starting any new medication. Proton pump inhibitors should be used at the lowest effective dose for the shortest duration necessary to control symptoms.

Trusted by thousands

Real people, real results

Jane L.

"Brilliant. Lost 4 stone on mounjaro no side effects at all. Cured pharmacy are excellent. Always helpful pens sent out quickly always comes with needles and sterile wipes. If you want to go on GLP-1 go to cured pharmacy. So professional. Thank you cured pharmacy you changed my health and well being."

Ann-Marie

"I absolutely love this product, I have been using 2.5mg as maintenance dose and have managed to control my weight without any side effects and can still eat well balanced meals. The pharmacy is very efficient friendly and helpful I would not purchase from anywhere else."

Sacha W.

"So far I'm really impressed by my results it's crazy cause I'm not snacking like how I used to do and I see my face slimming down already and it's only been 2 and a half weeks. Can't wait to give my feedback in 5 months time thank you cured pharmacy."

Kimberly G.

"Mounjaro has corrected my hormonal weight gain during menopause. I am using it now to maintain that balance. The results for me have been exceptional!"

Jennifer

"Great really helps cure those nasty habits can't wait for my next mounjaro pen."

How it Works?

Select from our recommended UK-licensed medications.

1

Choose your treatment

Step 1: Choose your treatment from Cured Pharmacy

Select safe UK treatments. Quick answers.

2

Answer quick questions

Step 2: Answer quick consultation questions

We will deliver direct to you as quickly as tomorrow.

3

Get it delivered fast

Step 3: Fast discreet delivery to your door

Faq

Is omeprazole or lansoprazole better for acid reflux?
Both medications are equally effective for acid reflux, with clinical trials showing comparable symptom relief rates of 70-80% after two weeks. Lansoprazole may provide slightly faster initial relief in some patients, but long-term efficacy is equivalent.
Can I switch from omeprazole to lansoprazole?
Yes, switching between PPIs is common and safe under prescriber guidance. If omeprazole doesn't adequately control your symptoms after two weeks, your UK prescriber may recommend trying lansoprazole, as individual response varies due to genetic differences in drug metabolism.
Which has fewer side effects: omeprazole or lansoprazole?
Both medications have similar side effect profiles, with headache, nausea, and abdominal discomfort affecting 2-7% of patients. Some individuals tolerate one PPI better than another, so switching under prescriber supervision may improve tolerability if side effects occur.
How much does omeprazole cost compared to lansoprazole?
At Cured Pharmacy, omeprazole starts from £9.99 for a 28-day supply, whilst lansoprazole costs from £9.99. Both prices include free online prescriber consultation and represent competitive UK pharmacy pricing for these medications.
Can I take omeprazole and lansoprazole together?
No, you should not take two PPIs simultaneously as this provides no additional benefit and increases the risk of side effects. If one PPI isn't effective, your prescriber may increase the dose or switch you to an alternative medication rather than combining treatments.
Which PPI is better if I take clopidogrel?
Lansoprazole is generally preferred for patients taking clopidogrel, as omeprazole can reduce clopidogrel's effectiveness by up to 40% through CYP2C19 enzyme interaction. Always inform your prescriber about all medications you're taking during your consultation.
How long can I take omeprazole or lansoprazole?
NICE guidelines recommend using PPIs at the lowest effective dose for the shortest duration necessary. Short-term use (4-8 weeks) is appropriate for most acid reflux cases, whilst long-term use requires regular prescriber review to monitor for potential side effects such as vitamin deficiencies or bone health concerns.
Do I need a prescription for omeprazole vs lansoprazole UK?
Omeprazole 10mg is available over the counter for short-term use (maximum 14 days), but 20mg and all lansoprazole strengths require a prescription. At Cured Pharmacy, our UK prescribers provide free online consultations to assess whether prescription-strength PPIs are appropriate for your symptoms.
Tarun Kumar, Prescribing Pharmacist

Medically reviewed by

Tarun Kumar, Prescribing Pharmacist (GPhC 2233073)

Reviewed on: June 03, 2026

Last reviewed: 13 August 2026

Last updated on 13 August 2026.

Review History

Our experts continually monitor new findings in health and medicine, and we update our articles when new information becomes available.

Why this page was updated on 13 August 2026

Content checked and updated as part of our periodic review, to ensure accuracy and currentness.

Current version (13 August 2026)

Edited by: The Editorial Team

Medically reviewed by:

Tarun Kumar, GPhC No. 2233073, Prescribing Pharmacist


How we source info.

When we present you with stats, data, opinion or a consensus, we'll tell you where this came from.