Mounjaro vs Wegovy in Edinburgh: A Clinical Comparison

Mounjaro (tirzepatide) and Wegovy (semaglutide 2.4mg) are the two clinically approved weekly weight loss injections available privately in Edinburgh, and both are prescribed at Bruntsfield Pharmacy. They work differently, produce different average results in clinical trials, and suit different patients. This guide sets out what the evidence actually shows — without oversimplifying or pushing you towards one treatment before you have spoken to a clinician.

The right choice depends on your medical history, any existing conditions, your previous response to treatments, and how your body responds during the early weeks. That is a clinical judgement, not a marketing decision. For the full clinical overview of Mounjaro specifically, see our complete guide to Mounjaro in Edinburgh.

How Mounjaro and Wegovy work differently

The mechanism difference between these two medications is clinically significant and is the primary reason their weight loss outcomes differ in trials.

Wegovy: single GLP-1 receptor agonist

Wegovy (semaglutide 2.4mg) works by mimicking GLP-1, a gut hormone released after eating. GLP-1 signals to the brain that you are full, slows gastric emptying, and reduces appetite. Semaglutide was the first injectable treatment specifically licensed for weight management in the UK and has a strong evidence base built over a decade of clinical use (first in Ozempic for diabetes, then Wegovy for weight loss).

Mounjaro: dual GIP + GLP-1 receptor agonist

Mounjaro (tirzepatide) activates both GLP-1 and GIP receptors simultaneously. GIP (glucose-dependent insulinotropic polypeptide) plays a role in fat storage, insulin secretion, and energy balance. The dual action amplifies the appetite-suppressing effect and produces greater metabolic changes than a GLP-1 agonist alone. Researchers believe this dual mechanism is the key reason Mounjaro produces substantially greater average weight loss in head-to-head data.

Clinical trial results: which produces more weight loss?

Mounjaro and Wegovy have not been directly compared in a single randomised controlled trial, so any comparison relies on data from their respective trial programmes — SURMOUNT for Mounjaro and STEP for Wegovy. This is worth keeping in mind when reading the numbers below, because the patient populations and study designs differed.

Side effect comparison

The side effect profiles of Mounjaro and Wegovy are broadly similar — both are GLP-1-based mechanisms and share the same class of gastrointestinal effects. The difference in GIP activity does not appear to produce a meaningfully different safety profile in practice.

Which is right for you?

Based purely on the weight loss data, Mounjaro produces greater average weight loss than Wegovy. That is not a sales pitch — it is what the clinical trial data shows. For patients whose primary goal is maximum weight loss and who meet the eligibility criteria for both, Mounjaro is generally the stronger option on the evidence available.

That said, Wegovy may be more appropriate in certain situations — for example, where a patient has already started on semaglutide and is responding well, where there is a specific clinical reason to prefer a GLP-1-only mechanism, or where cost at the higher Mounjaro dose tiers is a practical constraint. The decision belongs to you and your prescriber, made at consultation, not before you arrive.

Cost comparison in Edinburgh

Mounjaro at Bruntsfield Pharmacy starts at £180/month (2.5mg starter dose) and reaches £320/month at the maximum 15mg dose. For full Mounjaro pricing, see our Mounjaro cost guide. Wegovy pricing is available at consultation — your pharmacist will confirm current prices when you attend. Consultation and ongoing clinical support are included in the cost of both programmes.

Both Mounjaro and Wegovy at Bruntsfield Pharmacy, Edinburgh

One practical advantage of coming to Bruntsfield Pharmacy is that we prescribe both treatments. You are not committing to one before your consultation, and if your clinical assessment suggests the other is more appropriate, we can discuss that with you at the appointment. There is no pressure and no presumption — the recommendation follows the clinical picture, not the other way around.

How to get started

1. Book online. Use our booking system to select a weight loss consultation. Both Mounjaro and Wegovy appointments are available — you do not need to decide which treatment you want before you arrive.
2. Complete a short health questionnaire. You will be asked about your medical history, current medications, and weight loss goals before your appointment. This allows your pharmacist to prepare for the consultation.
3. Attend your appointment. Your Independent Prescriber will assess your suitability for each treatment, explain the differences, and make a clinical recommendation. Most consultations take under 30 minutes.
4. Leave with your prescription and first pen. If clinically appropriate, you will be prescribed and supplied your first injection at the same visit, along with injection training and an escalation plan.

Book your weight loss consultation in Edinburgh

Mounjaro vs Wegovy — your questions answered

Is Mounjaro better than Wegovy for weight loss?

In clinical trials, Mounjaro produced greater average weight loss than Wegovy — up to 22.5% vs up to 14.9% of body weight at the highest respective doses. This is consistent across the available trial data. However, individual responses vary significantly, and both treatments are effective. Whether Mounjaro is better for a specific patient depends on their full clinical picture, which is assessed at consultation.

Is Wegovy the same as Ozempic?

Wegovy and Ozempic both contain semaglutide, but they are different products with different licensed indications and doses. Ozempic (semaglutide 1mg) is licensed for type 2 diabetes. Wegovy (semaglutide 2.4mg) is licensed for weight management. Prescribing Ozempic off-licence for weight loss — which some services do — is not the same as prescribing Wegovy. At Bruntsfield Pharmacy we prescribe the correct licensed product for each indication.

Can I switch from Wegovy to Mounjaro?

Yes, in many cases. If you are already on Wegovy and feel your weight loss has plateaued, or if you would like to consider Mounjaro, book a consultation and your pharmacist will review your history and current dose before recommending whether a switch is appropriate and how to manage the transition safely.

Do Mounjaro and Wegovy have the same side effects?

The side effect profiles are broadly similar. Both commonly cause nausea, constipation, and reduced appetite — particularly during dose escalation. The dual GIP mechanism in Mounjaro does not appear to produce a meaningfully different tolerability profile compared to Wegovy in clinical practice. Individual response varies, and some patients tolerate one medication better than the other.

Which is cheaper — Mounjaro or Wegovy?

Mounjaro starts at £180/month at the 2.5mg starter dose and reaches £320/month at the maximum 15mg. Wegovy pricing is confirmed at consultation. The cost of either treatment should be weighed against the clinical benefit — a treatment that produces greater and more sustained weight loss may represent better value over a full course, even if the monthly cost at higher doses is slightly higher.

Do I need to decide before my consultation?

No. You can come to your consultation open-minded and let the clinical assessment guide the recommendation. Your pharmacist will review your history, explain the differences, and discuss which treatment is most appropriate for your specific situation. Most patients leave the consultation with a clear recommendation and their prescription at the same visit.