CompareTheJab guide
A clear UK comparison of the Wegovy pill, Foundayo and injectable GLP-1 treatments, covering clinical evidence, practical differences, side effects and costs.
Updated November 2026 UK treatment comparison
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Overview
The pill versus jab question is becoming practical
For most of the past three years, the question of which GLP-1 weight loss treatment to choose has been a choice between two injections: Mounjaro or Wegovy.
That has now changed. The MHRA licensed the Wegovy pill (oral semaglutide) in June 2026 and Foundayo (orforglipron) in August 2026, so UK patients can choose between a daily tablet and a weekly injection.
This comparison covers the clinical evidence, the practical differences, and the honest trade-offs that anyone considering a weight loss treatment in the UK needs to understand.
The bottom line: injections still produce the greatest average weight loss, especially Mounjaro, but the Wegovy pill comes close to the standard Wegovy injection for people who prefer not to inject.
But the emerging oral options are closing the gap quickly, and for needle-averse patients, the decision is more nuanced than the headline numbers suggest.
UK availability note: the Wegovy pill and Foundayo are licensed in the UK and available privately from regulated providers. Neither is available on the NHS yet.
Visual guide
Quick visual summary
A simple visual breakdown of the key points covered in this guide.
At a glance
The comparison at a glance
| Medication | Administration | Average weight loss | UK licensed | Estimated UK cost | Common side effects | Needle required | Storage | Dosing schedule |
|---|---|---|---|---|---|---|---|---|
| Mounjaro injection | Weekly self-injection pen | 20.2% in SURMOUNT‑5 | Yes | Approx. £140 to £370 per month | Nausea, vomiting, diarrhoea, constipation | Yes | Refrigerate before first use | Weekly, same day |
| Wegovy injection | Weekly self-injection pen | 13.7% to 20.7% in STEP studies | Yes | Approx. £89 to £320 per month | Nausea, vomiting, diarrhoea, constipation | Yes | Refrigerate before first use | Weekly, same day |
| Wegovy pill (oral semaglutide) | Daily pill with empty stomach and fasting rules | 13.6% in OASIS 4 | Yes, since June 2026 | Varies by provider and dose | Similar to injectable semaglutide | No | Room temperature | Daily, empty stomach |
| Foundayo (orforglipron) | Daily pill, any time, with or without food | About 11% at 72 weeks (highest dose) | Yes, since August 2026 | Varies by provider and dose | Mainly mild to moderate gastrointestinal effects | No | Room temperature | Daily, flexible timing |
Weight loss figures are averages from the main clinical trial for each medicine. Prices change often: check current prices on our Mounjaro and Wegovy comparison pages.
Clinical evidence
Weight loss results: does the pill match the jab?
The honest answer is that it depends which pill and which injectable option you are comparing.
Mounjaro vs oral alternatives
Injectable Mounjaro currently has the strongest weight loss evidence among the approved options. the available evidence notes 20.2% average body weight reduction over 72 weeks in SURMOUNT‑5.
The Wegovy pill comes closer than earlier oral options, but still sits below Mounjaro.
Wegovy vs oral semaglutide
Wegovy and oral semaglutide use the same active ingredient in different forms and dosing routes.
The Wegovy pill (13.6% in OASIS 4) performs similarly to the 2.4mg Wegovy injection (13.7% in SURMOUNT-5). The MHRA allows people on the 2.4mg injection to move straight to the 25mg tablet.
Orforglipron
Orforglipron may be attractive because it can be taken as a pill without the fasting rules associated with oral semaglutide.
However, its average weight loss (around 11% at the highest dose) is lower than the Wegovy pill and both injections.
Treatment choice
Pill or injection — the right choice depends on your priorities
Some patients value convenience and no needles, while others prioritise stronger evidence, weekly dosing and currently available UK treatment options.
Practical benefits
Where the pill may win
No needle anxiety
For people with needle anxiety or needle phobia, a weekly injection can be a genuine barrier. An oral option removes that barrier completely.
Easier travel and storage
Injectable options usually have refrigeration requirements before first use. Oral options are expected to be easier to store and easier to carry while travelling.
More discretion
A pill can feel more private than storing injection pens, needles and sharps disposal items at home or while travelling.
Dosing flexibility
Foundayo can be taken at any time, with or without food, while the Wegovy pill must be taken on an empty stomach with a 30-minute wait before eating.
Current UK reality
Where the jab still wins
Currently available in the UK
All four options (Mounjaro and Wegovy injections, the Wegovy pill and Foundayo) are now licensed in the UK and available through regulated private providers.
Stronger average weight loss evidence
The evidence base for injectable treatments is more mature, with large clinical trials and several years of prescribing experience behind them.
Established side effect management
UK clinicians and providers have more real-world experience supporting patients through nausea, dose changes and early treatment side effects with injectable GLP-1 treatments.
Once-weekly dosing
A weekly injection may be easier for some people than remembering a daily pill, especially if the pill has strict timing or fasting rules.
Side effects
Is the pill easier to tolerate?
Not substantially, based on the available evidence. GLP-1 side effects are mainly linked to the way the medicine works in the body, not only the way it is taken.
The most common side effects across injectable and oral GLP-1 treatments include nausea, vomiting, diarrhoea and constipation. These effects are often more noticeable during the early weeks of treatment and during dose increases.
Oral options avoid injection-site reactions such as bruising or irritation, but the gastrointestinal side effect profile may still be similar.
Costs
What could it cost?
Injectable Mounjaro currently starts from around £149 per month for the starter dose and can rise to around £300 to £375 per month at higher doses.
Wegovy is listed as starting from around £130 per month, with higher-dose monthly costs around £295.
UK pricing for oral semaglutide 25mg and orforglipron has not yet been confirmed, so patients should avoid assuming that oral options will definitely be cheaper.
Decision guide
Who should choose what?
Choose an injectable if
- You want to start treatment now through a licensed UK route.
- Maximum average weight loss is your main priority.
- You prefer weekly dosing instead of daily tablets.
- You want clearer current pricing.
- You are comfortable using a pen device after clinical guidance.
Consider waiting for an oral option if
- Needle anxiety is genuinely preventing you from starting treatment.
- Your travel or storage needs make injections difficult.
- You are prepared to wait for UK approval and pricing clarity.
- A qualified prescriber advises that an oral route may suit your circumstances.
Do not do this
- Do not buy unlicensed oral weight loss pills from unknown online sellers.
- Do not use diabetes medication for weight loss without proper clinical oversight.
- Do not assume regulatory approval will happen on a fixed date.
- Do not treat online information as personal medical advice.
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FAQs
Keep reading
- New Weight Loss Drugs Coming to the UK: What’s in the Pipeline for 2026 and 2027
- Ozempic vs Wegovy vs Mounjaro: What’s the Difference — and Which Should You Choose?
- Wegovy vs Mounjaro Cost: Which Actually Works Out Cheaper in the UK?
- Best Wegovy Providers UK 2026: Compared by Price, Support, and Clinical Quality
Compare today's prices: Mounjaro · Wegovy
Frequently asked questions
Is there a weight loss pill available in the UK right now?
No GLP-1 oral weight loss pill is currently licensed in the UK. Other oral weight loss medicines exist, but they work differently and are not the same as GLP-1 treatments.
Does a weight loss pill work as well as an injection?
Injections still have stronger average weight loss data overall, especially Mounjaro. The Wegovy pill performs close to the standard 2.4mg Wegovy injection.
Will I have the same side effects with a pill as with an injection?
Broadly, yes. Nausea, vomiting, diarrhoea and constipation are common GLP-1 class side effects whether the medicine is taken as a pill or injection. Oral options avoid injection-site reactions.
Can I switch from an injection to a pill?
Yes, with your prescriber's guidance. The MHRA says people on the 2.4mg Wegovy injection can move straight to the 25mg Wegovy pill. Other switches need a prescriber to decide the starting dose.
Which oral weight loss pill is best?
The Wegovy pill has the stronger weight loss results of the two licensed tablets. Foundayo is easier to take because it has no food or timing rules.
This article is for informational purposes only and does not constitute medical advice. CompareTheJab is an independent comparison website and is not a medical service. Always consult a qualified healthcare professional before starting, stopping or switching any medication.
Clinical trial data, regulatory status and pricing can change. This guide was last updated in November 2026. Some links on this website may be affiliate links. Editorial content should remain separate from commercial relationships.
Last updated: November 2026.
