If you're searching for weight-loss tablets in the UK, you're probably hoping for a pill that does what the injections do — without the needle. The honest answer is that the tablet market is smaller, newer and more limited than the injection market, but genuine prescription options do exist. This guide sets out what actually works, what to avoid, and what each option costs from a regulated UK pharmacy.
The only weight-loss tablets worth considering in the UK are prescription medicines from a regulated pharmacy: oral semaglutide (Wegovy pill) and older options such as orlistat. The most effective treatments remain the weekly injections — Mounjaro (tirzepatide) and Wegovy (semaglutide). Any "fat-burner" or "appetite" tablet sold without a prescriber assessment is not a serious weight-loss treatment, and unregulated online sellers should be avoided entirely.
What weight-loss tablets are actually available in the UK?
When people talk about weight-loss tablets in the UK, they usually mean one of three things, and they are very different in how well they work:
- Oral semaglutide (the Wegovy pill) — a daily tablet form of the same active ingredient as the Wegovy injection. This is the newest prescription tablet and the closest a pill gets to injection-level results.
- Orlistat (Xenical, or Alli at lower strength) — an older tablet that blocks around a quarter of dietary fat from being absorbed. Modest results and gastrointestinal side effects mean it is used far less now.
- Over-the-counter "diet pills" and fat-burners — caffeine blends, glucomannan and similar supplements. These are not licensed weight-loss medicines and are not the focus of this guide.
The prescription tablets are dispensed by GPhC-registered pharmacies or CQC-regulated clinics after a prescriber checks your suitability. Supplements are sold freely but carry none of that oversight — and none of the evidence.
How well do weight-loss tablets work compared with injections?
This is the crucial trade-off. Tablets are more convenient, but the strongest results still come from the weekly injections:
- Mounjaro (tirzepatide) injection: in the SURMOUNT-1 trial, mean weight loss was around 21–22% at the higher doses over 72 weeks.
- Wegovy (semaglutide) injection: the STEP 1 trial showed roughly 15% average weight loss at the 2.4 mg dose.
- Oral semaglutide (Wegovy pill): a daily tablet delivering the same active ingredient, which suits people who prefer to avoid injecting.
- Orlistat tablet: typically a much smaller reduction — often in the region of 3–5% of body weight — and only alongside a reduced-fat diet.
If your priority is the largest possible weight loss, an injection is likely to outperform any tablet. If needle avoidance is the deciding factor, oral semaglutide is the tablet closest to that performance. Our sibling guide on injections vs tablets breaks down the efficacy, cost and convenience trade-offs in detail.
Weight-loss tablet prices in the UK
Prices for the Wegovy pill are tracked at fewer UK pharmacies than the injections, but the starter-dose figures below are from GPhC-registered providers (last checked 01 September 2026). First-month promotional prices apply to the starter dose only.
| Provider | Ongoing (starter dose) | First month | Code |
|---|---|---|---|
| Chemist4U | £99 / 4 weeks | — | NEW26 |
| The Weight Clinic | £115 / 4 weeks | £80 | NEWME |
The Wegovy pill sits close in price to the Wegovy injection, which starts from around £88.96/4 weeks at the cheapest regulated provider. For a full breakdown of how the tablet and injection versions of semaglutide compare on cost, see our guide on Wegovy injection vs Wegovy pill costs.
How Mounjaro (an injection) compares on price
Because Mounjaro is the most effective option overall, it's worth seeing where it sits on cost even if you started out looking for a tablet. Here are the ongoing 2.5 mg starter-dose prices at a selection of verified UK pharmacies:
| Provider | Ongoing (2.5mg) | First month | Code |
|---|---|---|---|
| Click2Pharmacy | £145.99 / 4 weeks | — | C2P20 |
| Chemist4U | £148 / 4 weeks | £122 | NEW26 |
| ASDA Online Doctor | £148.97 / 4 weeks | £118.97 | NWFG30 |
| The Weight Clinic | £160 / 4 weeks | £125 | NEWME |
| Numan | £219 / 4 weeks | — | — |
| Second Nature | £209 / 4 weeks | £179 | — |
Across all tracked providers, the identical Mounjaro pen ranges from £143.96 to £229 for the starter dose — an £83 spread. Our recommended provider, The Weight Clinic, sits in the middle on the headline price but offers £35 off your first order with code NEWME, monthly video reviews with a prescriber, and a refund if the prescriber declines you. You can see every provider side by side on our homepage price table.
Who can get prescription weight-loss tablets?
Eligibility is broadly the same as for the injections. Privately, most prescribers require a BMI of 30 or above, or 27 or above with a weight-related condition such as type 2 diabetes, high blood pressure or sleep apnoea. A prescriber makes the final decision after reviewing your medical history and current medicines.
Mounjaro is MHRA-licensed for weight management and recommended by NICE (TA1026, December 2024). It is being rolled out on the NHS in phases from 2025, prioritising those with the highest BMI and most weight-related conditions first, so NHS access still varies by area. For the full rules, read our guide on weight-loss medication eligibility in the UK.
Side effects and staying safe
GLP-1 medicines — whether tablet or injection — commonly cause nausea, diarrhoea, constipation, vomiting and tiredness, especially when the dose is increased. Rarer but serious risks include pancreatitis, gallstones, dehydration that can strain the kidneys, and low blood sugar if combined with insulin or a sulfonylurea. Orlistat's side effects are mainly digestive, linked to unabsorbed fat.
If you experience a side effect, you can report it through the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk. This helps monitor the safety of all medicines in the UK.
Tablets sold over social media, marketplaces or overseas websites — often marketed as "fat-burners", "appetite blockers" or "compounded" versions of prescription medicines — are not licensed and can be dangerous. Buy only from a UK pharmacy on the GPhC register or a CQC-regulated clinic, after a genuine prescriber assessment.
The Weight Clinic is our recommended GPhC-registered provider. You get a prescriber assessment, monthly video reviews, a refund if the prescriber declines you, and £35 off your first order with code NEWME.
For the bigger picture across every option, our complete 2026 guide to weight-loss medications and our cost comparison across 24 UK providers cover the whole category in one place.
Frequently asked questions
Are there weight-loss tablets that work as well as the injections?
Not quite. Oral semaglutide (the Wegovy pill) is the tablet closest to injection performance, but the strongest results still come from the Mounjaro and Wegovy injections. Older tablets like orlistat produce much smaller reductions.
How much do prescription weight-loss tablets cost in the UK?
The Wegovy pill starts from around £99/4 weeks at the cheapest tracked pharmacy for the starter dose, with a first-month promotional price of £80 at The Weight Clinic using code NEWME.
Can I buy weight-loss tablets over the counter?
A low-strength version of orlistat (Alli) is available without prescription, but effective prescription tablets like oral semaglutide require a prescriber assessment. Over-the-counter "diet pills" and supplements are not licensed weight-loss treatments.
Who is eligible for prescription weight-loss tablets?
Privately, most prescribers require a BMI of 30 or above, or 27 or above with a weight-related condition. A prescriber makes the final decision based on your medical history.
Are online weight-loss tablets safe?
They are safe if bought from a GPhC-registered pharmacy or CQC-regulated clinic after a real consultation. Avoid social media sellers, marketplaces and overseas sites — these are where counterfeit and unlicensed products circulate.
What should I do if I get side effects?
Common side effects include nausea and digestive upset. If you experience anything concerning, contact your prescriber and report it via the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk. This is information only, not medical advice.