Wegovy Tablets vs Mounjaro: Daily Pill or Weekly Injection?
The first daily weight loss pill against the strongest weekly injection — how they compare on results, mechanism, side effects and real-world routine.
Part of the Overweight and Obesity Guide.
Key fact: Mounjaro delivers the stronger trial results — up to 20.9% average weight loss versus 13.6–16.6% for Wegovy tablets — but the tablet is the first licensed option in the UK that requires no injections at all. For many people, that single difference decides it.
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Access Doctor provides both Wegovy tablets and Mounjaro following a GPhC-regulated online consultation with our pharmacist independent prescribers.
Order Wegovy Tablets →Since June 2026, the UK weight loss medication choice has a new dimension. It used to be a question of which injection; now it’s whether you need an injection at all. Wegovy tablets — once-daily oral semaglutide — sit at one end of the convenience spectrum, and Mounjaro, the most effective licensed injection, at the other end of the results spectrum.
Unlike comparing the two Wegovy formulations, this is a comparison of two genuinely different medicines. Here’s how they stack up.
Two different medicines
Wegovy tablets contain semaglutide 25mg, a GLP-1 receptor agonist taken once daily by mouth. The MHRA approved them on 11 June 2026 as the first oral GLP-1 medicine for weight management in the UK.
Mounjaro contains tirzepatide, a once-weekly injection that activates two receptors — GLP-1 and GIP. It has been available in the UK since 2024 and holds the strongest weight loss results of any licensed medicine. The dual mechanism is explained in full in how does Mounjaro work?
The differences at a glance
| Wegovy Tablets | Mounjaro | |
|---|---|---|
| Active ingredient | Semaglutide | Tirzepatide |
| Mechanism | GLP-1 receptor agonist (single receptor) | Dual GIP and GLP-1 receptor agonist |
| How taken | Tablet, once daily, on an empty stomach with a 30-minute fast after | Injection, once weekly, with or without food |
| Maintenance dose | 25mg daily (after 1.5mg → 4mg → 9mg steps) | 5mg, 10mg or 15mg weekly (from 2.5mg start) |
| Average weight loss | 13.6% over 64 weeks; 16.6% on-treatment (OASIS 4) | Up to 20.9% over 72 weeks at 15mg (SURMOUNT-1) |
| Needles | None | One per week |
| Storage | Room temperature | Refrigerated before first use |
| UK availability | Launching from H2 2026, private prescription first | Established since 2024 |
Weight loss results compared
Both medicines were tested in large placebo-controlled trials of adults with obesity, or overweight plus a weight-related condition, alongside diet and activity support. The trials were separate — there is no direct head-to-head between these two — but the gap in averages is consistent and real:
20.9%
Mounjaro 15mg — average loss over 72 weeks (SURMOUNT-1)
16.6%
Wegovy tablets — on-treatment average over 64 weeks (OASIS 4)
5–10%
Weight loss linked to major health improvements
Two caveats keep those numbers honest. First, averages hide enormous individual variation — some people respond better to semaglutide than tirzepatide, and vice versa. Second, both medicines clear the clinically meaningful bar by a wide margin: the 5–10% loss associated with better blood pressure, blood sugar and cholesterol is comfortably exceeded by typical responders to either.
Worth knowing: in OASIS 4, around a third of people who took Wegovy tablets exactly as prescribed lost 20% or more of their body weight — injection-level results from a pill, for the right person taking it the right way.
One receptor or two: why mechanism matters
Semaglutide activates the GLP-1 receptor — reducing appetite, slowing stomach emptying and increasing fullness. Tirzepatide does that too, but additionally activates the GIP receptor, which appears to enhance the appetite-suppressing effect and improve how the body handles fat and sugar. That second receptor is the leading explanation for Mounjaro’s stronger trial averages.
Mechanism isn’t destiny, though. The medicine that produces the most weight loss on paper is not the one that produces the most weight loss in someone who stops taking it — adherence beats pharmacology every time, which is exactly where the tablet’s needle-free format earns its place.
Daily pill vs weekly pen
Wegovy tablets: no needles, strict mornings
One tablet on waking, empty stomach, small sip of water, then 30 minutes of nothing — every day. No fridge, no sharps, nothing to declare at airport security.
Mounjaro: one jab, six free days
A single weekly injection at any time, with or without food. No daily rules at all — but it is still a needle, weekly, indefinitely.
Missed dose flexibility
Mounjaro allows up to 4 days to catch up a missed weekly dose. The tablet's daily schedule offers less slack — a missed morning is usually a missed day.
Other medicines
The tablet's fasting window has to be coordinated with any other morning medicines. Mounjaro doesn't interfere with a morning pill routine.
Side effects and safety
The two medicines share the GLP-1 class profile: nausea, vomiting, diarrhoea and constipation are the most common side effects of both, concentrated around dose increases and usually settling as the body adjusts. Both carry the same key cautions — not for use in pregnancy, with a personal or family history of medullary thyroid carcinoma or MEN2, and with care after pancreatitis. Gallbladder problems are an uncommon risk of rapid weight loss with either.
Differences worth noting: the tablet spares you injection-site reactions but adds more upper-digestive complaints such as indigestion and burping; Mounjaro’s dual mechanism doesn’t translate into meaningfully worse tolerability in trials, and serious adverse events were uncommon with both. Our Mounjaro side effects guide covers management tactics that apply to the whole class.
Diagnosis and assessment first. Neither medicine is a casual purchase — both are prescription-only, require a BMI-based eligibility check plus a medication and medical history review, and work properly only alongside dietary change and activity.
Which one is right for you?
Wegovy tablets if…
Injections are the reason you haven't started treatment, you travel constantly, or you want the simplest possible logistics — and you can protect a strict morning routine.
Mounjaro if…
Maximum average weight loss is the priority, you'd rather deal with treatment once a week, or your mornings are too unpredictable for a daily fasting window.
Both paths start the same way: a clinical assessment with a prescriber who can weigh your history, medicines and preferences. And neither choice is final — switching between treatments under supervision is routine when circumstances change. For the full landscape including orlistat and the Wegovy injection, see our UK guide to prescription weight loss medication.
Order Mounjaro or Wegovy Tablets Online
One short online consultation covers both options — our GPhC-registered pharmacist independent prescribers will recommend the treatment that fits your health and your life.
Order Mounjaro →Frequently Asked Questions
Which is more effective, Wegovy tablets or Mounjaro?
On trial averages, Mounjaro. Tirzepatide 15mg produced up to 20.9% average weight loss over 72 weeks in SURMOUNT-1, while Wegovy tablets produced 13.6% over 64 weeks in OASIS 4 — 16.6% in those who stayed on treatment. Individual responses vary widely, and both comfortably exceed the 5–10% loss linked to major health improvements.
Are Wegovy tablets and Mounjaro the same type of medicine?
They are related but not identical. Wegovy tablets contain semaglutide, which activates one gut hormone receptor (GLP-1). Mounjaro contains tirzepatide, which activates two (GIP and GLP-1). That dual action is thought to explain Mounjaro's stronger average results in trials.
Can you take Wegovy tablets and Mounjaro together?
No. Combining two GLP-1-based medicines is not licensed, has no evidence of added benefit, and substantially increases the risk of severe digestive side effects. If one medicine isn't delivering results, your prescriber can adjust the dose or switch you — never add one to the other.
Can you switch from Mounjaro to Wegovy tablets, or the other way?
Yes, under prescriber supervision. Switching is usually considered when side effects are troublesome, results have stalled, or the routine isn't working. Because the medicines and doses differ, your prescriber will choose an appropriate starting dose of the new treatment rather than a like-for-like swap.
Is a daily pill easier to stick to than a weekly injection?
It depends on the person. The tablet avoids needles entirely but demands a strict daily routine — taken on an empty stomach with a 30-minute wait before food or drink. Mounjaro requires one weekly injection but no fasting rules. The better choice is whichever routine you can genuinely sustain long term.
Both treatments are available from Access Doctor following an online consultation reviewed by a GPhC-registered pharmacist independent prescriber, dispensed from our UK pharmacy.
Weight Loss · Rx
Wegovy Tablets (Oral Semaglutide)
The first daily weight loss pill licensed in the UK — 25mg oral semaglutide.
View product →Weight Loss · Rx
Mounjaro (Tirzepatide)
Once-weekly dual-action injection with up to 20.9% average weight loss in trials.
View product →References
- Aronne LJ, et al. Oral Semaglutide at a Dose of 25 mg in Adults with Overweight or Obesity (OASIS 4). N Engl J Med. 2025. nejm.org
- Jastreboff AM, et al. Tirzepatide Once Weekly for the Treatment of Obesity (SURMOUNT-1). N Engl J Med. 2022;387:205–216. nejm.org
- Medicines and Healthcare products Regulatory Agency. MHRA approves oral semaglutide (Wegovy) tablets for weight management. 2026. gov.uk
- National Institute for Health and Care Excellence. Tirzepatide for managing overweight and obesity (TA1026). London: NICE. nice.org.uk
- National Institute for Health and Care Excellence. Semaglutide for managing overweight and obesity (TA875). London: NICE. nice.org.uk
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for diagnosis and treatment. In a medical emergency, call 999.