Wegovy Pill vs Mounjaro: Daily Tablet or Weekly Injection?

Until July 2026, choosing between weight loss medicines in the UK meant choosing between injections. The arrival of the Wegovy pill changed the shape of that decision: it is now a choice between two genuinely different medicines with genuinely different routines — semaglutide as a once-daily tablet, or tirzepatide (Mounjaro) as a once-weekly injection. They are made by different manufacturers, work on different combinations of gut hormone receptors, and ask different things of your week.

We prescribe both at Edinburgh Vaccination Clinic, so this comparison has no thumb on the scale. It covers how the two medicines differ, what the trial evidence does and does not tell you, and the practical factors that actually decide it for most patients. For the full guide to the tablet, see the Wegovy pill in Edinburgh; for the injection, see our complete Mounjaro guide.

Two different medicines, not two versions of one

The Wegovy pill is oral semaglutide, a GLP-1 receptor agonist: it mimics one gut hormone to reduce appetite and slow stomach emptying. Mounjaro is tirzepatide, which acts on two receptors — GLP-1 and GIP — a dual mechanism that appears to produce greater average weight loss in trials, though with the same family of gastrointestinal side effects. This is a different situation from the pill-vs-injection choice within Wegovy, where the medicine is identical and only the delivery differs. Here both the molecule and the routine change at once, which is why this comparison deserves more care.

What the two share is everything structural: the same licensed eligibility criteria (BMI 30 or above, or 27–30 with a weight-related condition), gradual dose escalation under supervision, regular reviews, and treatment alongside diet and activity changes rather than instead of them.

What the evidence shows — and what it can’t

Read the trials side by side and the pattern is consistent. Tirzepatide’s SURMOUNT-1 trial reported average weight loss of up to around 20% of body weight at the highest dose over 72 weeks — the largest figures published for any licensed weight loss medicine. The Wegovy pill’s OASIS 4 trial reported an average of around 17% over 64 weeks at the 25mg dose. Both figures dwarf what diet and lifestyle interventions achieve on average; the gap between them is real but smaller than the marketing around either medicine suggests.

Now the caveats, which matter more here than usual. These are separate trials with different participants, durations and designs — there is no head-to-head trial of Mounjaro against the oral Wegovy tablet, so precise comparisons between the averages are not supportable. And trial averages are not personal predictions: within every trial, some participants lost far more than the average and some far less. A medicine you take correctly and consistently will beat a theoretically stronger one that never fits your life. That is not a platitude; it is the single most common lesson from our review appointments.

The practical differences

In practice, the decision usually turns on two axes. Needles: if injections are simply not something you will do — and for a meaningful number of people that is the honest position — the Wegovy pill is the treatment you will actually take, which makes it the better treatment for you regardless of trial tables. Routine: if your mornings cannot reliably accommodate an empty stomach and a 30-minute wait, seven days a week, Mounjaro’s once-weekly rhythm with no food rules will serve you better. Patients for whom both would work sit down with us and weigh the evidence gap against the lifestyle fit — that conversation is exactly what the consultation is for.

Choosing between them is a clinical decision

Beyond preference, there are clinical factors that push the decision one way or the other: your medical history, other medicines — particularly anything else that needs an empty stomach — previous experience with GLP-1 treatments, and how your body responds in the first months. Some patients start on one and switch to the other; that is a planned process, not a failure. What we will not do is pick a medicine for you off a comparison table, and you should be wary of any provider that does. The table narrows the field; the assessment makes the choice.

How to get started

1. Book online. Choose a weight management consultation at our Bruntsfield clinic below.
2. Complete a digital consultation form on arrival. A short form covering your medical history and current medicines, done in clinic when you arrive.
3. Attend your appointment. A full eligibility assessment and an open comparison of the Wegovy pill, Mounjaro and the other options.
4. Leave with a clear plan. If treatment is appropriate, you leave with your first supply and your review dates booked.

Wegovy pill vs Mounjaro — your questions answered

Related reading: our complete guide to the Wegovy pill, our complete Mounjaro guide, and Mounjaro vs Wegovy injection compared.