To choose a weight loss injection provider in the UK, check that it is a GPhC-registered pharmacy, that a registered prescriber reviews your health before any medicine is issued, that it supplies only genuine MHRA-licensed medicines, and that its pricing and after-care are clear. You can verify any UK pharmacy on the General Pharmaceutical Council (GPhC) register at pharmacyregulation.org.
Weight loss injections such as Mounjaro (tirzepatide) and Wegovy (semaglutide) are prescription-only medicines. That means a legitimate provider cannot simply sell them to you — a prescriber must decide they are clinically appropriate first. The sections below explain exactly what to look for.
What makes a weight loss injection provider legitimate in the UK?
A legitimate UK weight loss injection provider dispenses from a pharmacy registered with the General Pharmaceutical Council (GPhC), prescribes through a GPhC-registered independent prescriber, supplies only MHRA-licensed medicines, and is registered with the Information Commissioner's Office (ICO) for data protection. These are checkable facts, not marketing claims.
For example, at The Weight Clinic medicines are dispensed by our own GPhC-registered pharmacy, North Harrow Pharmacy (GPhC registration number 1034996), and the Superintendent Pharmacist is Andrew Lane (GPhC 2027876). You can confirm both entries directly on the GPhC register — a legitimate provider will always give you a registration number you can look up.
How do I check a provider is a registered pharmacy?
You check a provider is a registered pharmacy by searching its pharmacy name and GPhC registration number on the GPhC online register at pharmacyregulation.org, which is free and public. If a website selling injections will not tell you which pharmacy dispenses the medicine, or has no GPhC number, treat that as a warning sign.
Use this quick checklist:
- A named, GPhC-registered dispensing pharmacy with a registration number you can search.
- A named Superintendent Pharmacist responsible for clinical governance.
- ICO registration and compliance with the NHS Data Security and Protection Toolkit (DSPT) for your data.
- A UK address and contact route, not just a web form.
Should a weight loss injection be prescribed after a consultation?
Yes — a weight loss injection should only be prescribed after an online consultation in which a GPhC-registered prescriber reviews your health, with a video consultation where clinically needed. No legitimate UK provider guarantees a prescription in advance or lets you "check out" the medicine like an ordinary product, because these are prescription-only medicines.
A sound process usually looks like this:
- You complete a free online consultation about your health and weight.
- A registered prescriber reviews your answers to check treatment is clinically appropriate and safe.
- A short video consultation takes place where clinically needed.
- If suitable, your medicine is dispensed by the UK pharmacy and sent by tracked delivery, with ongoing prescriber support.
You can see how this works and start a free eligibility check without committing to treatment — a prescription is only issued if it is clinically appropriate.
Am I even eligible for a weight loss injection?
You may be eligible for a weight loss injection if you are aged 18 or over and have a BMI of 30 or more, or a BMI of 27 to 30 with a weight-related condition such as type 2 diabetes, high blood pressure or sleep apnoea. A good provider confirms this during the consultation rather than leaving you to self-assess.
These medicines are not suitable if you are pregnant, planning pregnancy or breastfeeding; have type 1 diabetes; have a personal or family history of medullary thyroid carcinoma or MEN2; have had pancreatitis; have severe gastrointestinal disease, an active eating disorder, severe liver or kidney impairment, or a known allergy to the active ingredient. A legitimate prescriber screens for all of these.
How should I compare the cost of weight loss injections?
Compare the cost of weight loss injections on the total of the medicine, dose, delivery and prescriber support — not on a single headline figure. Price usually rises with dose as you titrate upward, and the cheapest starting dose is not the dose you stay on, so look at what each strength costs across the whole range.
At The Weight Clinic the online consultation is free; you only pay if a treatment is prescribed and you choose to proceed. Current monthly prices by medicine and dose are:
| Medicine | Dose range (monthly price) |
|---|---|
| Mounjaro (tirzepatide) | 2.5mg £160, 5mg £185, 7.5mg £240, 10mg £260, 12.5mg £275, 15mg £295 |
| Wegovy injection (semaglutide) | 0.25mg £115, 0.5mg £125, 1mg £135, 1.7mg £175, 2.4mg £230, 7.2mg £245 |
| Wegovy Tablet (oral semaglutide) | 1.5mg £115, 4mg £130, 9mg £145, 25mg £190 |
| Foundayo (orforglipron) | 0.8mg £115, 2.5mg £115, 5.5mg £115, 9mg £130, 14.5mg £160, 17.2mg £160 |
Be cautious of prices that seem far below the market. Genuine, MHRA-licensed medicines have a real cost, and unusually cheap offers can signal unlicensed or grey-market products.
What are the warning signs of an unsafe provider?
The clearest warning signs of an unsafe weight loss injection provider are: no GPhC-registered pharmacy named, no prescriber review, no screening questions, and medicines sold directly without a consultation. Selling a prescription-only medicine to the UK public without a prescription is unlawful, so any site doing this is one to avoid.
- No GPhC registration number you can verify on pharmacyregulation.org.
- You can buy the injection with no health questions and no prescriber involvement.
- Unlicensed, "generic" or vial-based products not matching the licensed brands.
- Pressure to buy quickly, or claims that a specific medicine is guaranteed to work for you.
- No named pharmacist, no UK address and no after-care.
No medicine cures obesity, and no provider should promise a guaranteed outcome.
What results do these injections actually produce?
Trial results give a realistic benchmark, and a trustworthy provider quotes them honestly with the caveat that results vary. In the SURMOUNT-1 trial, participants on the Mounjaro 15mg dose lost on average 22.5% of body weight over 72 weeks, alongside lifestyle support. In the STEP UP trial, adults on the Wegovy 7.2mg dose lost on average 20.7% of their body weight over 72 weeks, alongside lifestyle support. Individual results vary; not everyone reaches this.
For the oral options, in the OASIS 4 trial adults on oral semaglutide 25mg (the Wegovy Tablet) lost on average 16.6% of their body weight over 64 weeks, alongside lifestyle support, and in the Phase 3 ATTAIN-1 trial participants on the 36mg orforglipron trial dose lost on average 12.4% of their body weight over 72 weeks, alongside lifestyle counselling. Individual results vary; not everyone reaches this. These are separate trials, not head-to-head comparisons.
What side effects should I expect to be told about?
A responsible provider explains the common side effects of these GLP-1 based injections before you start: nausea, diarrhoea, constipation, vomiting, decreased appetite and fatigue, each affecting more than 1 in 10 people. Rare but serious risks include severe allergic reaction, acute pancreatitis, severe low blood sugar, severe gastrointestinal disease and worsening diabetic retinopathy.
You can report any suspected side effect to the MHRA Yellow Card scheme at https://yellowcard.mhra.gov.uk/. If a provider does not discuss side effects or make after-care available, that is a reason to look elsewhere.
You can read more across our treatments overview, the weight loss injections page, or learn about our regulated process on the about page and the blog.
This article is for information only and is not a substitute for personalised medical advice. Weight-loss medicines are prescription-only, are not suitable for everyone, and are prescribed only after a clinical consultation with a GPhC-registered prescriber. Individual results vary. Always speak to a UK-registered pharmacist or doctor before starting or changing any prescription medication.
