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Is it safe to get Mounjaro or Wegovy from an online pharmacy in the UK?

What the pharmacy regulator requires before an online prescriber supplies a weight-loss medicine. Plus how to check a pharmacy, and the warning signs.

GLP Guidebook teamPublished 12 Oct 20265 min read16 sourcesWritten from published sources

Written for the UK. Reading from India? India version

The short answer

It can be legal and safe if a registered pharmacy supplies it on a prescription after a proper check. Since February 2025, the GPhC has required online prescribers to verify your weight, height or BMI independently, by video, in person or from your records, not from a questionnaire or a photo alone.

Key takeaways

  • Online pharmacies in Great Britain must be registered with the GPhC, and in Northern Ireland with the PSNI; you can check either register yourself.1,2
  • Since 4 February 2025, GPhC guidance treats weight-loss medicines as high-risk, so an online questionnaire alone is not enough to prescribe them.3
  • The GPhC says weight must be verified by video, in person, from your records or via your GP; a phone call or a photo alone is not appropriate.4
  • The GPhC received 1,307 concerns about weight-loss medicine services in 2024 and 2025; 27% were about prescribing and 17% about advertising.5
  • In February 2026, the MHRA found falsified Mounjaro 15 mg pens, batch D873576, supplied through one UK online pharmacy.6
Before you go further
  • We don’t name, rate or link to any pharmacy, clinic or online service. UK law bans advertising prescription-only medicines to the public.7,8
  • GLP‑1 medicines are prescription-only medicines in the UK, never sold over the counter.9
  • Ozempic and Rybelsus are licensed for type 2 diabetes only, not for weight loss.1
  • A prescriber decides whether a medicine fits, which one and at what dose. Nothing here is a recommendation.
  • The risks are the same however you get it: see our side effects guide.
On this page
  1. Is it legal to get a weight-loss medicine online?
  2. What checks must an online prescriber do?
  3. How do you check a pharmacy is registered?
  4. What are the warning signs of an unsafe seller?
  5. What if something goes wrong?
  6. Questions people ask
  7. How we researched this
  8. Sources

What checks must an online prescriber do?

They must verify your weight, height or BMI independently before a first supply, and should share the prescription with your GP if you agree.3,4

The GPhC’s February 2025 guidance moved weight-loss medicines onto its high-risk list.3 For these, a prescriber “cannot base prescribing decisions on the information provided in an online questionnaire alone”.3

The GPhC lists acceptable ways to verify your weight:4

  • Acceptable: a video consultation, an in-person check, your clinical records, or contact with your GP.
  • Not appropriate: a phone call, or only a photo or pre-recorded video you send.
  • Repeat supplies: a photo or video may be acceptable once your first weight was verified another way, with periodic checks.

The prescriber should share the prescription with your GP if you consent.4 If they can’t verify your details, they should send you to another care provider instead.4

The GPhC’s 2026 review heard of pharmacies asking for photos in “tight-fitting clothes” or underwear. It said such practices did not match its expectations.5

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How do you check a pharmacy is registered?

Look it up on the GPhC register for England, Scotland and Wales, or the PSNI register for Northern Ireland.1

The MHRA points patients to both registers.1 All pharmacies in Great Britain, including online ones, must be registered with the GPhC.2

Registration is a minimum, not a guarantee. The falsified Mounjaro pens found in February 2026 came through a UK online pharmacy. The GPhC then placed conditions on that pharmacy.6

The GPhC’s review shows where problems cluster. Of 1,307 concerns, 27% were about prescribing and 25% about customer service. Another 17% were about advertising, and 31% about issues such as cold-chain failures.5

What are the warning signs of an unsafe seller?

No prescription, no real weight check, powder in vials, social-media sellers and retatrutide are all warning signs the MHRA names.1,10

  • No prescription needed. The MHRA’s advice: if you’re offered a GLP‑1 without a prescription, walk away.10
  • Powder in vials to mix yourself. These are not authorised in the UK.1
  • Salons and social media. The MHRA says never buy from them.1
  • Retatrutide. It is not authorised in the UK, so anyone selling it is doing so illegally.10
  • Deals that seem too good to be true. The MHRA tells buyers to be wary of them.10
  • Ads for “weight-loss injections”. The ASA treats these words, and pictures of injection pens, as advertising a prescription-only medicine, which is banned.7

Our post on fake Mounjaro and illegal jabs covers what the MHRA has seized.

What if something goes wrong?

Report side effects or a suspect pen to the MHRA’s Yellow Card scheme, and tell your GP what you are taking.1,11

The Yellow Card scheme takes reports online. Its free hotline is 0800 731 6789, Monday to Friday, 9am to 5pm.12 The MHRA asks people to report suspected fakes there too.1

If a pen is faulty, the MHRA says not to try to use it.6 Tell your GP about any medicine you buy privately. It may affect your health and other treatments.11

Our side effects guide covers what to watch for.

RisksThe risks, in brief
  • Stomach effects. In the main trials, about 44 in 100 people on Wegovy 2.4 mg felt sick (nausea), against about 16 in 100 on a dummy injection. On Mounjaro it was about 25 to 29 in 100, against about 9 in 100 on a dummy injection. It mostly comes while the dose goes up.13,14
  • Gallbladder problems. Gallstones were reported in about 16 in 1,000 people on Wegovy 2.4 mg. Acute gallbladder disease affected about 20 in 1,000 on Mounjaro, against about 16 in 1,000 on a dummy injection.13,14
  • Pancreatitis (an inflamed pancreas): severe stomach pain that won’t go away and may spread to the back. The MHRA updated its guidance on it in January 2026.15
  • Dehydration from vomiting or diarrhoea can harm the kidneys.14,13
  • Surgery and pregnancy. Tell the team before any anaesthetic. The MHRA advises stopping semaglutide at least 2 months before a planned pregnancy, tirzepatide 1 month.1
Full detail in our side effects guide →
Get help now: call 999 or go to A&E for severe stomach pain that won’t go away, with or without vomiting. It can be pancreatitis. Not sure? Use NHS 111 (in Northern Ireland, your GP’s out-of-hours service).15,16

Questions people ask

Can I get Mounjaro online without seeing anyone?

Not under GPhC guidance. The prescriber must verify your weight, height or BMI by video, in person, from your records or via your GP.4

Will the online pharmacy tell my GP?

GPhC guidance expects the prescriber to share the prescription with your regular prescriber, with your consent. Without consent, the prescriber decides whether it is still safe to prescribe.4

Why did an online pharmacy ask for a photo in my underwear?

The GPhC found such requests in its 2026 review and said they don’t match its expectations. A photo alone isn’t an acceptable first check.5,4

Is it legal to buy retatrutide online in the UK?

No. Retatrutide is not authorised in the UK, so the MHRA says anyone selling it is doing so illegally.10

How do I report a fake or faulty pen?

Use the MHRA Yellow Card scheme, online or on the free hotline, 0800 731 6789. Don’t try to use a faulty pen.12,6

How we researched this

On 12 October 2026 we read the GPhC’s February 2025 guidance notice, its weight-management FAQs and its April 2026 review. We also read MHRA, ASA and NHS inform pages.

We name no pharmacy or service. The MHRA has ruled that a news article naming a prescription medicine alongside UK suppliers counted as an advert. So we describe rules, not sellers.

Before you move on

  • Check the pharmacy on the GPhC or PSNI register.
  • Expect a video, in-person or records check of your weight.
  • Agree to the pharmacy telling your GP, or tell your GP yourself.
  • Walk away from any seller offering it without a prescription.
  • Report side effects or a suspect pen to Yellow Card.
Doctor questionsSeeing a doctor, and the medicinesSide effects and risks

More from the UK blog

UKUnited KingdomHow do you spot fake Mounjaro or an illegal weight-loss jab in the UK?UKUnited KingdomHow much do Mounjaro and Wegovy cost in the UK, on the NHS or privately?UKUnited KingdomCan I switch from private to NHS Mounjaro?
About GLP Guidebook

The monthly UK update

An independent guide to GLP‑1 medicines. We don’t sell medicines, take drug-company money, earn commissions or link to any provider. Once a month: NHS changes, approvals, list prices and safety alerts. How we write

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Sources

  1. MHRA. GLP-1 medicines for weight loss and diabetes: what you need to know. Guidance, published 5 June 2025, updated 5 February 2026. Link
  2. MHRA. MHRA warns of unsafe fake weight loss pens. Press release, 26 October 2023. Link
  3. General Pharmaceutical Council. Online pharmacies to strengthen safeguards to prevent unsafe supply of medicines. News, 4 February 2025. Link
  4. General Pharmaceutical Council. Providing weight management services: FAQs. Link
  5. General Pharmaceutical Council. Weight management medicines and services: a review of GPhC inspections and concerns. April 2026. Link
  6. MHRA. Drug Safety Update: Falsified Mounjaro (tirzepatide) KwikPen 15mg pre-filled pens. 24 February 2026. Link
  7. ASA and CAP. Weight control: prescription-only medicines (advice online). Link
  8. MHRA. Promotion of a prescription-only medicine by National World Publishing Ltd on The Scotsman website: March 2025 (advertising investigation). Published 11 April 2025. Link
  9. MHRA. UK first in Europe to authorise orforglipron for weight management and type 2 diabetes. Press release, 10 August 2026. Link
  10. MHRA. No summer shortcut for safe weight loss. Press release, 24 July 2026. Link
  11. NHS Cheshire and Merseyside (integrated care board). Tirzepatide (Mounjaro) for obesity: information for patients from 1 April 2026. Link
  12. NHS inform (Scotland). Prescriptions: reporting side effects (Yellow Card hotline). Link
  13. Novo Nordisk. Wegovy FlexTouch: UK summary of product characteristics (SmPC), electronic Medicines Compendium. Date of revision 09/2026. Link
  14. Eli Lilly. Mounjaro KwikPen: UK summary of product characteristics (SmPC), electronic Medicines Compendium. Date of revision 29 August 2026. Link
  15. MHRA. MHRA updates guidance for GLP-1 prescribers and patients. Press release, 29 January 2026. Link
  16. NHS. When to call 999. Link

Last checked 12 Oct 2026 · Next review due 12 Apr 2027 · Report an error

How this post was made. Written by the GLP Guidebook team from the sources above. It’s general information, not medical advice. Talk to your GP, pharmacist or prescriber before starting, stopping or changing any medicine. We don’t sell, prescribe or recommend any brand or provider. How we write