Weight Loss Drugs Comparison: Mounjaro, Wegovy or Wegovy Pill?
This weight loss drugs comparison covers Mounjaro, Wegovy injection and the Wegovy pill. All three are prescription treatments used alongside diet and physical activity, but they are not interchangeable. They differ in active ingredient, dosing routine, dose increases and the evidence available for each medicine.
The best option is personal. Your prescriber will consider your health history, other medicines, previous treatment, likely ability to follow the routine and your preferences. This guide helps you compare those practical points before your assessment.
For a closer look at two treatments at a time, read our Mounjaro vs Wegovy comparison, Wegovy pill vs Mounjaro comparison or Wegovy pill vs injection comparison.
The Three Options at a Glance| Mounjaro | Wegovy Injection | Wegovy Pill | |
|---|---|---|---|
| Active ingredient | Tirzepatide | Semaglutide | Semaglutide (oral) |
| How it works | Dual GIP + GLP-1 receptor agonist | GLP-1 receptor agonist | GLP-1 receptor agonist |
| How it's taken | Weekly injection | Weekly injection | Daily tablet |
| Dose range | 2.5mg – 15mg | 0.25mg – 2.4mg (7.2mg licensed) | 1.5mg – 25mg |
| UK approval | 2023 | 2022 (7.2mg: Jan 2026) | 11 June 2026 |
Both are self-administered once-weekly injections using a pre-filled pen. They can be taken with or without food, but each follows its own titration schedule. See how to inject Mounjaro and Wegovy, the Mounjaro dose schedule and the Wegovy dose schedule for the practical differences.
The Wegovy PillThe Wegovy pill uses oral semaglutide and must be taken after at least eight hours of fasting, with no more than 120 mL of water, followed by a 30-minute wait before food, drink or other oral medicines. Our guide to how to take the Wegovy pill explains the routine in full. The tablet avoids needles, but it requires more precise daily timing than a weekly injection.
Results vary significantly between individuals, and the figures below are trial averages, not guarantees. They come from the manufacturers' head-to-head and placebo-controlled trial programmes.
| Treatment | Trial | Average weight loss* |
|---|---|---|
| Mounjaro 15 mg | SURMOUNT-1 | 20.9% at 72 weeks |
| Wegovy injection 2.4 mg | STEP 1 | 14.9% at 68 weeks |
| Wegovy injection 7.2 mg | STEP UP | 17.4% at 68 weeks |
| Wegovy pill 25 mg | OASIS 4 | 13.6% at 64 weeks |
Trial averages cannot predict an individual result. Starting health, dose tolerance, adherence, eating pattern, activity and time on treatment all affect progress. A prescriber should review your response rather than choosing a medicine from one headline percentage.
All three medicines commonly cause gastrointestinal effects such as nausea, diarrhoea, vomiting, constipation and abdominal symptoms, particularly while the dose increases. Mounjaro and injected Wegovy can also cause injection-site reactions. Separate studies cannot reliably tell you which medicine you personally will tolerate best.
| Mounjaro | Wegovy Injection | Wegovy Pill | |
|---|---|---|---|
| Common digestive effects | Nausea, diarrhoea, vomiting, constipation | Nausea, diarrhoea, vomiting, constipation | Nausea, diarrhoea, vomiting, constipation |
| Injection-site reactions | Possible | Possible | Not applicable |
| Practical consideration | Weekly injection and needle disposal | Weekly injection and needle disposal | Daily fasting, water and waiting instructions |
The UK product information lists allergy to the active ingredient or another component as the formal contraindication. Pregnancy, breastfeeding, pancreatitis history, severe digestive disease, diabetes medicines and other health factors can still affect suitability or monitoring. Read the dedicated Mounjaro side effects, Wegovy injection side effects and Wegovy pill side effects guides, and disclose your full history during assessment.
Happy Pharmacy starting prices checked on 11 October 2026 are shown below. Prices can change and higher doses may cost more, so compare the latest Wegovy prices with the other product links before ordering.
| Treatment and starting strength | Subscription | Single purchase |
|---|---|---|
| Mounjaro 2.5 mg | £134.99 | £149.99 |
| Wegovy injection 0.25 mg | £89.99 | £99.99 |
| Wegovy pill 1.5 mg | £98.99 | £109.99 |
Mounjaro may be practical if…
- You prefer a once-weekly routine and are comfortable self-injecting.
- A prescriber considers tirzepatide suitable after reviewing your health and medicines.
- Your response and tolerance can be reviewed during gradual dose increases.
Wegovy injection may be practical if…
- You prefer a once-weekly semaglutide treatment.
- The licensed cardiovascular benefit of Wegovy is relevant to your clinical assessment.
- You are comfortable self-injecting and disposing of needles safely.
The Wegovy pill may be practical if…
- You strongly prefer to avoid injections.
- You can reliably follow the daily fasting, water and waiting instructions.
- Your other oral medicines can be timed safely around the tablet.
A change may be considered if treatment is ineffective, difficult to tolerate or impractical. There is no UK-licensed dose-equivalence chart or single waiting period that applies to everyone. Your prescriber will decide when the new medicine should start and which starting dose is appropriate after reviewing your final dose, last treatment date, side effects and other medicines. Do not overlap treatments or create your own transition. Read our guide on how to switch from Mounjaro to Wegovy for more detail.
Making Your Decision: Questions to Ask Your Prescriber- Which option is most appropriate given my medical history and any current medication?
- Am I better suited to a weekly injection or a daily tablet, realistically, given my routine?
- What result would be considered a good outcome for me personally, rather than the trial average?
- What's the plan if I don't tolerate my first-choice treatment well?
- How will my dose be adjusted over time, and how often will I be reviewed?
Our weight loss medications overview brings together information on the treatment options and listed prices.
Not Sure Which Treatment Is Right For You?
Every treatment plan at Happy Pharmacy starts with a free online consultation, reviewed personally by our GPhC-registered pharmacy team. We'll help you weigh up Mounjaro, Wegovy and the Wegovy pill against your own health history, goals and preferences. No guesswork, no pressure.
Start Your Free Online Consultation →Use code SWITCH10 if you're switching from another providerRead about treatment formats, listed prices and the assessment process at Happy Pharmacy. A prescriber will assess whether any treatment is suitable for you.
Weight loss medicationsHappy Pharmacy is a GPhC-registered pharmacy (No. 9013192). Superintendent Pharmacist: Palvinder Deol. Rated 4.8★ Excellent on Trustpilot- Mounjaro KwikPen Summary of Product Characteristics. UK indication, dosing, safety information and SURMOUNT-1 results.
- Wegovy 2.4 mg Summary of Product Characteristics. UK indication, dosing, safety information and STEP 1 results.
- Wegovy 7.2 mg Summary of Product Characteristics. STEP UP efficacy result and UK prescribing information.
- Wegovy 25 mg tablets Summary of Product Characteristics. OASIS 4 efficacy and safety data.
- MHRA. First GLP-1 tablet for weight loss approved in the UK.
Medically Reviewed by Our GPhC-Registered Pharmacists
