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Wegovy Pills: How They Work and How They Compare to the Injection

  • Jul 29
  • 5 min read

Updated: Aug 4


Wegovy is now available in the UK as a once-daily pill as well as the established once-weekly injection. Both contain the same active ingredient (semaglutide) and produce broadly comparable weight loss in clinical trials, but they differ significantly in daily routine, dosing, and administration. Which is more suitable depends on individual preference, tolerance, and clinical factors assessed by a prescriber.


What are Wegovy pills?

Wegovy (semaglutide) has, until recently, only been available in the UK as a weekly injection. In June 2026, the UK Medicines and Healthcare products Regulatory Agency (MHRA) licensed Wegovy for weight loss in pill form as well as injectable form, making it the first oral GLP-1 medicine approved for weight loss in the UK.

Like the injection, the pills contain semaglutide, which works by mimicking a naturally occurring gut hormone that helps regulate blood sugar and reduces hunger and cravings, leading to better control over eating habits.

Dosing. The tablet medication is absorbed through the gut rather than injected directly into the body and results in less of the medicine getting through. This is why the pill's dose (up to 25mg) is numerically far higher than the injection's (2.4mg) - it reflects how little of an oral dose the body actually absorbs, not a stronger medicine.

Effectiveness. Trial data suggests the injection and the pill perform similarly.  In the oral pill's pivotal trial, participants who took the 25mg dose as intended achieved an average weight loss of 13.6% over 64 weeks;  in the injection's pivotal trial, participants achieved an average weight loss of 14.9% over 68 weeks.

It’s worth noting that Mounjaro, in its pivotal trial, found that participants who took the 10mg or 15mg injection achieved an average weight loss of over 20% over 72 weeks – so Mounjaro has achieved better results than both the Wegovy options.

Routine. This is really where the two options diverge. The pill has to be taken on an empty stomach with a very small amount of water, followed by a wait before you can eat, drink, or take other medicines - a routine repeated every single day. The injection, by contrast, is a once-weekly task with no fasting requirement.

Things to weigh up:

  • Needle aversion or lifestyle fit - if you would prefer to avoid self-injecting, this naturally favours the pill.

  • Daily routine tolerance – would you find a strict daily fasting-and-waiting routine harder to maintain than a single weekly injection?

  • Travel and storage - injection pens need to be stored in a fridge before first use and have specific in-use storage rules, whereas pills do not require refrigeration and are generally easier to carry and store.

The two forms share a broadly similar side effect profile, since they deliver the same active ingredient. The most commonly reported effects relate to the digestive system, particularly during the early weeks of treatment or after a dose increase: nausea, diarrhoea, vomiting, constipation, stomach pain, bloating, gas, indigestion, and reduced appetite are all frequently reported, alongside headache, tiredness, and dizziness.


Less common but more serious effects that require medical attention include inflammation of the pancreas (pancreatitis), gallbladder problems including gallstones, and allergic reactions. Anyone experiencing severe or persistent abdominal pain, signs of an allergic reaction, or a lump or swelling in the neck should seek medical advice promptly.


This isn't an exhaustive list, and anyone starting treatment should read the patient leaflet in full.

Yes - switching between forms is possible under prescriber supervision, though the two doses don't convert on a simple milligram-for-milligram basis because absorption differs so much between an injection and a swallowed pill.


For people already on the highest standard injection dose, the switch is relatively straightforward. Guidance from Novo Nordisk (the manufacturer) indicates that patients on the 2.4mg weekly injection can move to the 25mg daily pill without needing to restart the pill's dose-escalation process from the beginning, typically starting the pill around a week after the last injection dose. For people on a lower injection dose who haven't yet reached 2.4mg, there isn't a single confirmed direct-switch dose – the doctor will need to decide the appropriate starting point and whether further pill-dose titration is needed.


Switching the other way -  from pill to injection - is less standardised, and current UK prescribing information doesn't set out a universal reverse conversion, so this would need to be planned individually with the doctor.

For anyone starting on the pill from scratch (rather than switching from the injection), the UK dosing schedule follows a gradual step-up, typically over about four months:

  • 1.5mg once daily to start

  • 4mg once daily after at least one month

  • 9mg once daily after at least a further month

  • 25mg once daily after at least a further month


Each step is normally held for a minimum of one month before increasing, and your doctor may recommend staying at a given dose for longer if side effects need time to settle. Not everyone will need to reach the full 25mg dose - this is determined individually.

Wegovy is a prescription-only medicine used to support weight management alongside a reduced-calorie diet and increased physical activity. It's approved for adults with a body mass index (BMI) of 30 or more, and for adults with a BMI between 27 and 30 who also have at least one weight-related health condition.


Beyond meeting the BMI criteria, a healthcare professional will also take into account factors such as medical history, current medications, plans for pregnancy, and existing health conditions before recommending treatment. Wegovy isn't suitable for everyone, and the doctor will assess individual suitability before any prescription is issued.

  1. Take it once daily, first thing in the morning, on an empty stomach.

  2. Swallow the pill whole with no more than 120ml (about half a cup) of plain water - more water than this can reduce how well it's absorbed.

  3. Wait at least 30 minutes before eating, drinking, or taking any other oral medicines.

  4. Take it at roughly the same time each day.


Because of these fasting requirements, many people find it easiest to take the pill as soon as they wake up, before their usual morning routine begins.

Yes. We offer the Wegovy injection and pill, as well as Mounjaro at our private GP clinics in Henley and Reading.


Our weight loss programme is led by experienced GPs who provide ongoing medical care throughout your treatment. You'll have regular appointments to monitor your progress and health, routine blood tests to ensure treatment remains appropriate, and access to your GP if you have any questions between reviews.


Rather than simply prescribing medication, we provide personalised medical support every step of the way, helping you lose weight safely and with confidence.


To find out more about our weight loss programme, click below or call us.





This article is for general information only and does not replace individual medical advice. Whether Wegovy is suitable for you can only be assessed by a healthcare professional after reviewing your medical history.

 Article last reviewed by Dr Mike Thomas: 27 July 2026.

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