Short answer: No weight loss patch is licensed as a medicine in the UK, and a "GLP-1 patch" is not a GLP-1 medicine. In a ruling of 15 July 2026, the Advertising Standards Authority (ASA) found that an advert for a GLP-1 patch presented it as a medicine without the authorisation a medicine needs, and the company behind it said its patches contained no semaglutide, tirzepatide or any other active medicinal substance. The MHRA, the UK medicines regulator, says genuine GLP-1 medicines come as pre-filled pens or tablets, on a prescription. The licensed options we supply are Mounjaro, Wegovy injections, Wegovy tablets, Foundayo and orlistat, and a GPhC-registered pharmacist reviews each one before it is supplied.
This guide sets out what the ASA, the MHRA, the NHS and the UK product information say, as of October 2026: what GLP-1 patches are, why the GLP-1 medicines are not made as patches, which medicines that reduce appetite are licensed and which older ones were withdrawn, what the NHS offers, and how to check that a weight loss medicine is genuine.
Do weight loss patches work?
No weight loss patch has been licensed as a medicine in the UK, so none has shown the MHRA that it works and is acceptably safe. A licence, called a marketing authorisation, is what the MHRA grants once it has assessed a medicine's quality, safety and effectiveness. Patches sold for weight loss have not been through that assessment, so the claims made for them have not been tested the way a medicine's are.
There is also a physical reason to doubt them. The medicines in Mounjaro and Wegovy are large molecules, many times the size that a widely cited review of skin absorption says can pass through skin. We explain that below.
What are GLP-1 patches?
"GLP-1 patch" is a marketing name, not the name of a medicine. GLP-1 is a hormone your gut releases after you eat, and GLP-1 medicines, such as the semaglutide in Wegovy, work like it, acting on the parts of the brain that control appetite. A product sold as a GLP-1 patch does not have to contain any GLP-1 medicine, and the one the ASA ruled on in July 2026 did not: its seller described it as "a topical product with non-pharmaceutical ingredients". Our guide to GLP-1 medicines explains how the real ones work.
The advert in that ruling (ASA ruling A26-1333913) was seen on Facebook in March 2026. It told readers to "take control of your cravings and metabolism" and promised they would "reduce hunger naturally" and "stay fuller for longer". The ASA found that people would understand the patch to work like, or the same as, GLP-1 injections, which are prescription-only medicines. That made the advert present the patch as a medicine, and the advertiser held no authorisation for one, so the ASA ruled that it broke the advertising code (CAP Code rules 12.1 and 12.11) and must not appear again. It also found the advert irresponsible, because people would understand it as promoting the patch directly to breastfeeding mothers.
The same applies to anything sold as a Mounjaro patch or a Wegovy patch. Neither medicine is made as a patch: Mounjaro comes as a weekly injection from a KwikPen, and Wegovy as a weekly injection from a pre-filled pen or as a daily tablet.
Is there a licensed GLP-1 patch in the UK?
No. The MHRA says genuine GLP-1 medicines come as pre-filled pens or tablets, on a prescription, and that semaglutide sold as a powder in a vial, to mix yourself, is never an authorised product. As of October 2026, the GLP-1 medicines we supply for weight loss are weekly injections (Mounjaro and Wegovy) and daily tablets (Wegovy tablets and Foundayo). This is how a product sold as a GLP-1 patch compares:
| The question | A "GLP-1 patch" | A licensed GLP-1 medicine |
|---|---|---|
| Is it licensed by the MHRA? | No. The ASA found that the advert it ruled on presented the patch as a medicine without an authorisation | Yes. Each has a UK marketing authorisation and published UK product information |
| Does it contain semaglutide or tirzepatide? | No, in the one the ASA ruled on: its seller said it contained no semaglutide, tirzepatide, liraglutide, exenatide or any other active medicinal substance | Yes. Wegovy contains semaglutide and Mounjaro contains tirzepatide. Foundayo contains orforglipron |
| Does it need a prescription and a pharmacist's review? | No. It is not a medicine, so no prescription is involved | Yes. GLP-1 medicines are prescription-only. Through Solira, a GPhC-registered pharmacist reviews your consultation before anything is supplied |
| Does it come with a UK product leaflet? | No. It is not a licensed medicine, so it has no approved UK product information or leaflet | Yes. Its patient information leaflet is in the pack and on the electronic medicines compendium |
| Can side effects be reported on the Yellow Card scheme? | You can report a product you think is a fake medicine, but nobody has assessed the patch's safety as a medicine | Yes. The Yellow Card scheme takes reports of suspected side effects to all medicines |
Why can a GLP-1 medicine not work through a patch?
Because the medicines in Mounjaro and Wegovy are far bigger than the molecules that can pass through skin from an ordinary patch. Your skin's outer layer is a barrier. A widely cited review of skin absorption (Bos and Meinardi, Experimental Dermatology, 2000) argued that a compound must weigh under 500 daltons, the unit molecular weight is measured in, to be absorbed through the skin, and pointed out that every medicine then used in skin patches was under that size. Semaglutide, the medicine in Wegovy, weighs about 4,114 daltons, and tirzepatide, the medicine in Mounjaro, about 4,813 (PubChem, the US National Library of Medicine's chemical database). Each is more than eight times the limit the review describes.
That is our pharmacist's reading of the review, not a statement from the MHRA, but it is consistent with every GLP-1 medicine being licensed as a pen or a tablet. Other ways of getting such medicines through the skin are a research question, and as of October 2026 no such product is licensed in the UK. Getting semaglutide into the body by mouth is hard too. Wegovy tablets contain an added ingredient, salcaprozate sodium, which the UK product information says "facilitates the absorption of semaglutide", and even then absorption from the tablet varies more than from the injection (Wegovy tablets SmPC, sections 4.2 and 5.2). That is why the tablet comes with strict rules:
What the tablet contains: Wegovy tablets: semaglutide, salcaprozate sodium and magnesium stearate.
How it is taken: One tablet, once a day. Timing is everything. Take your tablet on an empty stomach after fasting for at least 8 hours (for most people, first thing in the morning). Swallow it whole with up to 120 ml of water. Don't split, crush or chew it. Then wait at least 30 minutes before any food, drink, or other medicines taken by mouth. The 30-minute wait includes water beyond the small amount you take the tablet with, and yes, that includes your morning tea or coffee. Eating or drinking sooner significantly reduces how much medicine your body absorbs, which means it simply won't work as well.
If a medicine that is swallowed needs a special ingredient and a fasting rule to be absorbed, a patch on the skin is not a substitute for it. Our guide on whether Wegovy is safe covers what the licensed medicine does.
Are weight loss patches safe?
Nobody can say that they are, because they have not been assessed as medicines, and you cannot check what is in them against approved product information. The MHRA warns that weight loss products sold illegally online can be fake, contaminated, wrongly dosed or contain ingredients that are not on the label.
If you have used a patch or another weight loss product bought online and you feel unwell, stop using it, keep the packaging, and speak to a pharmacist or your GP. The MHRA's Yellow Card scheme takes reports of fake medicines and of side effects to any medicine, herbal medicines included. If you take a medicine you have been prescribed, never stop it or swap it for a patch or supplement without speaking to the person who prescribed it.
Are weight loss patches available on the NHS?
No. The NHS treatments for overweight and obesity in adults are weight management programmes, medicines and, for some people, surgery, usually through a GP referral, and the NHS lists no patch among them. The medicines it describes are the GLP-1 and GIP medicines, which reduce appetite, and orlistat, which stops some of the fat in food being absorbed, each prescribed alongside advice on diet and lifestyle. Who qualifies, and where, is in our guide to weight loss injections on the NHS.
What appetite suppressants are licensed in the UK?
The licensed medicines that reduce appetite are prescription medicines, and they include the GLP-1 medicines Mounjaro, Wegovy (as injections or tablets) and Foundayo. The NHS describes GLP-1 and GIP medicines as reducing appetite, and the UK product information for Wegovy says semaglutide acts on the appetite areas of the brain. Each needs a healthcare professional to check that it is suitable for you before it is supplied.
Orlistat is a licensed weight loss medicine, but it is not an appetite suppressant. It works in your gut, stopping some of the fat in your food from being absorbed. Take one capsule immediately before, during, or up to one hour after each main meal, up to three times a day. If you miss a meal, or a meal contains no fat, skip that dose.
Older prescription weight loss medicines were taken off the market:
| Medicine | What happened |
|---|---|
| Sibutramine (Reductil) | In February 2010 the European Medicines Agency's medicines committee (CHMP) recommended suspending its licences across the EU, after a review found that its cardiovascular risks outweighed its benefits. In the SCOUT study, high-risk patients taking it had a 16% higher risk of heart and circulation problems such as heart attack and stroke than those on placebo. The MHRA told pharmacists not to dispense it |
| Rimonabant (Acomplia) | Authorised in June 2006. Its marketing was suspended across the EU on 13 November 2008, and its authorisation was withdrawn in January 2009 |
Are appetite suppressant pills bought online legal?
Some are legal food supplements, but a product presented as treating or preventing disease, or one that works through a pharmacological effect on the body, counts as a medicine in UK law and needs the authorisation a medicine must have. The MHRA's guidance on borderline products says it looks at the claims made for a product, both what is said and what is implied, what its ingredients do in the body, its purpose, how it is labelled, packaged and promoted, and whether similar licensed products exist. Food supplements made of familiar substances such as vitamins and minerals come under food law unless they are presented for medicinal uses, and herbal or "natural" ingredients do not, on their own, stop a product being a medicine.
That is how the ASA treated the GLP-1 patch advert: by presenting the patch as working like a prescription medicine, it presented it as a medicine. GLP-1 medicines themselves are prescription-only: the MHRA says those sold through beauty salons or social media are being sold illegally. Products sold online as retatrutide are not authorised in the UK either, as our retatrutide guide explains.
What are the licensed options for weight loss?
These are the licensed weight loss medicines we supply, as of October 2026. For each one, our consultation asks about your health and your medicines, and a GPhC-registered pharmacist reviews your answers before anything is supplied.
- Mounjaro (tirzepatide): a weekly injection from a multi-dose KwikPen.
- Wegovy (semaglutide): a weekly injection from a pre-filled pen.
- Wegovy tablets (semaglutide): one tablet a day, taken on an empty stomach as described above.
- Foundayo (orforglipron): one tablet a day.
- Orlistat: a capsule taken with your main meals, which stops some of the fat in food being absorbed.
Who the weekly injections may suit
Treatment may be suitable if you're aged 18–85 and have a BMI of 30 or above, or a BMI of 27–29.9 alongside one of the following: high blood pressure, raised cholesterol or blood fats, obstructive sleep apnoea, cardiovascular disease, prediabetes, or type 2 diabetes.
The tablets and orlistat have their own rules, set out on each treatment page. Not sure of your BMI? Use our BMI calculator.
How the options differ, side by side, is in our guide to Mounjaro alternatives, and the safety of each injection is covered in Is Mounjaro safe? and Is Wegovy safe?
Want to know whether a licensed medicine could suit you? Our consultation asks about your health and your medicines, and a GPhC-registered pharmacist reviews every answer before anything is supplied.
Check your eligibilityHow do you tell if a weight loss product is genuine?
Check how it is supplied, what form it comes in and who supplies it. These checks follow the MHRA's advice on GLP-1 medicines:
It needs a prescription. GLP-1 medicines are prescription-only. The MHRA says selling them through beauty salons or social media is illegal, so a seller that skips a consultation is a warning sign.
It is a pre-filled pen or a tablet. The MHRA says genuine GLP-1 medicines come as pre-filled pens or tablets. A powder in a vial, to mix yourself, is never an authorised product, and no GLP-1 medicine comes as a patch.
The pharmacy is on the register. Any pharmacy in Great Britain can be checked on the General Pharmaceutical Council's register. QuickCare Pharmacy, the registered pharmacy that dispenses Solira orders, is GPhC 9013213.
The leaflet is in the pack. A licensed medicine comes with its UK patient information leaflet, and you can read the same leaflet on the electronic medicines compendium.
Report anything that looks wrong. If you think a medicine is fake, do not use it. Keep it, and report it on the MHRA Yellow Card website, which takes reports of fake medicines as well as side effects.
More on buying weight loss medicine safely is on our safety page.