Our Pricing

Mounjaro vs Saxenda UK: Clinical Comparison for Weight Loss

Published on: June 03, 2026

Choosing between mounjaro vs saxenda uk comparison options requires understanding how these two injectable weight loss treatments differ in mechanism, efficacy, and practical use. Both are MHRA-licensed prescription medications available through Cured Pharmacy following clinical assessment by a UK prescriber, but they work through distinct pathways and deliver different results in clinical trials.

How Mounjaro and Saxenda Work Differently

Mounjaro contains tirzepatide, the first dual GIP/GLP-1 receptor agonist licensed in the UK for weight management [1]. By activating both glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) receptors, tirzepatide produces enhanced effects on appetite regulation, insulin secretion, and energy expenditure compared to single-pathway treatments.

Saxenda contains liraglutide, a GLP-1 receptor agonist that has been available in the UK since 2015 [2]. Liraglutide mimics the action of a single natural hormone (GLP-1) to slow gastric emptying, reduce appetite, and improve glycaemic control. While effective, it operates through one pathway rather than two, which influences the magnitude of weight loss observed in clinical trials.

Mounjaro vs Saxenda UK: Clinical Trial Results

In the SURPASS-3 trial, patients taking Mounjaro 15mg achieved an average body weight reduction of 22.5% over 72 weeks [1]. The lower 5mg maintenance dose still delivered approximately 15% average weight loss, demonstrating dose-dependent efficacy across the tirzepatide range.

The SCALE Obesity and Prediabetes trial showed that Saxenda patients achieved an average 8% body weight reduction over 56 weeks, with 63.2% of participants losing at least 5% of their baseline weight [2]. While clinically significant, this represents roughly one-third of the weight loss seen with the highest Mounjaro dose in head-to-head comparisons.

It's important to note that individual responses vary considerably, and these are average results from controlled trials. Your UK prescriber will consider your medical history, weight loss goals, and any contraindications when recommending the most appropriate treatment following your clinical assessment.

Understanding Trial Populations

Both trials enrolled adults with a BMI of 30 or above, or 27 or above with at least one weight-related comorbidity such as hypertension or dyslipidaemia [1][2]. Participants received lifestyle intervention support alongside medication, reflecting best-practice weight management protocols recommended by NICE guidance.

Dosing Schedule and Administration

Mounjaro is administered once weekly via subcutaneous injection using a pre-filled KwikPen device. Treatment typically begins at 2.5mg weekly for four weeks, then escalates to 5mg, with further increases to 7.5mg, 10mg, 12.5mg, or 15mg based on individual response and tolerability [3]. The once-weekly schedule offers convenience for patients with busy lifestyles.

Saxenda requires daily subcutaneous injection, starting at 0.6mg and increasing by 0.6mg increments each week until reaching the maintenance dose of 3mg daily [4]. The daily administration provides steady hormone levels but requires greater commitment to a daily injection routine. Some patients find the daily schedule easier to remember, while others prefer the simplicity of weekly dosing.

Injection Technique and Site Rotation

Both medications are injected into the abdomen, thigh, or upper arm using similar pen devices. Proper site rotation reduces the risk of lipodystrophy and injection-site reactions. Your Cured Pharmacy clinical team will provide detailed administration instructions following your consultation, and our superintendent pharmacist Tarun Kumar (GPhC 2233073) ensures all patients receive comprehensive support materials with their first prescription.

Side Effects: Mounjaro vs Saxenda Comparison

Both medications share a similar side effect profile, as they belong to the same therapeutic class. The most common adverse effects are gastrointestinal: nausea, diarrhoea, vomiting, constipation, and abdominal discomfort [1][2]. These symptoms typically emerge during dose escalation and diminish over several weeks as the body adapts to treatment.

In clinical trials, nausea occurred in approximately 44% of Mounjaro patients and 39% of Saxenda patients [1][2]. The incidence of gastrointestinal side effects tends to be dose-dependent for both medications, which is why gradual titration is essential. Starting at a low dose and increasing slowly allows your digestive system to adjust and minimises treatment discontinuation.

Serious but rare side effects include pancreatitis, gallbladder disease, and hypoglycaemia (particularly in patients taking concurrent diabetes medications). Both Mounjaro and Saxenda carry a boxed warning regarding thyroid C-cell tumours observed in rodent studies, though no causal relationship has been established in humans [3][4]. Your UK prescriber will review your full medical history to identify any contraindications before prescribing either medication.

Mounjaro vs Saxenda UK: Pricing and Value

At Cured Pharmacy, Mounjaro is available from £124.99 per prescription, subject to clinical assessment and dose prescribed. While initial costs may appear higher than some alternatives, the superior average weight loss observed in clinical trials means patients may reach their goals more quickly, potentially reducing the overall treatment duration required.

Saxenda pricing reflects its daily dosing requirement and established market presence. When comparing overall value, consider not just the per-prescription cost but also the frequency of administration, average efficacy from trials, and your personal treatment goals. Our transparent upfront pricing ensures you know costs before completing your clinical consultation, with no hidden fees or surprise charges.

What's Included in Your Cured Pharmacy Service

Every prescription includes free clinical consultation with a UK-registered prescriber (typically completed in under three minutes), genuine UK-licensed medication dispensed by our GPhC-registered pharmacy (9012511), discreet packaging, and ongoing support from our clinical team. We guarantee the lowest prices in the UK and provide clear guidance on injection technique, side effect management, and treatment optimisation.

Which Treatment Is Right for You?

Mounjaro may be more suitable if you're seeking maximum weight loss potential and prefer once-weekly administration. Clinical trial data shows significantly greater average weight reduction with tirzepatide compared to liraglutide, making it an appropriate choice for patients with higher BMI targets or those who haven't achieved sufficient results with other GLP-1 medications [1][2].

Saxenda remains an excellent option for patients who prefer daily dosing (which some find easier to incorporate into morning routines), those with cost considerations, or individuals who have previously responded well to GLP-1 therapy. Its longer track record in the UK market means extensive real-world safety data is available, and many patients achieve clinically meaningful weight loss with liraglutide.

Ultimately, the decision should be made in consultation with a UK prescriber who can assess your individual circumstances, medical history, current medications, and weight management goals. Both treatments require commitment to lifestyle modifications including dietary changes and increased physical activity to achieve optimal results, as demonstrated in the clinical trials that supported their MHRA licensing [3][4].

Starting Your Weight Loss Journey with Cured Pharmacy

Begin by completing our free online consultation, which takes under three minutes and is reviewed by a UK-registered prescriber. If clinically appropriate, your prescription will be dispensed by our GPhC-registered pharmacy and delivered discreetly to your address. Our clinical team remains available throughout your treatment to answer questions, provide guidance on side effect management, and support your weight loss journey with evidence-based advice.

Scientific References

1. Jastreboff, A. M., Aronne, L. J., Ahmad, N. N., et al. (2022). Tirzepatide Once Weekly for the Treatment of Obesity. New England Journal of Medicine, 387(3), 205–216. https://doi.org/10.1056/NEJMoa2206038 [accessed 13 August 2026]
2. Pi-Sunyer, X., Astrup, A., Fujioka, K., et al. (2015). A Randomized, Controlled Trial of 3.0 mg of Liraglutide in Weight Management. New England Journal of Medicine, 373(1), 11–22. https://doi.org/10.1056/NEJMoa1411892 [accessed 13 August 2026]
3. Medicines and Healthcare products Regulatory Agency. (2023). Mounjaro 2.5 mg solution for injection in pre-filled pen: Summary of Product Characteristics. Retrieved from https://www.medicines.org.uk/emc/product/14395 [accessed 13 August 2026]
4. Medicines and Healthcare products Regulatory Agency. (2015). Saxenda 6 mg/ml solution for injection in pre-filled pen: Summary of Product Characteristics. Retrieved from https://www.medicines.org.uk/emc/product/2313 [accessed 13 August 2026]
5. NHS. (2026). Tirzepatide: a medicine to manage type 2 diabetes and treat obesity. https://www.nhs.uk/medicines/tirzepatide/ Accessed 13 August 2026.
6. NHS. (2026). Overweight and obesity in adults. https://www.nhs.uk/conditions/overweight-and-obesity/ Accessed 13 August 2026.
7. NHS England. (2026). Weight management injections. https://www.england.nhs.uk/ourwork/prevention/obesity/medicines-for-obesity/weight-management-injections/ Accessed 13 August 2026.

Information on this page is for educational purposes only and is not medical advice. All prescription treatments require clinical assessment by a UK-registered prescriber. Always consult a qualified healthcare professional before starting any new medication. Individual results may vary, and weight loss outcomes depend on adherence to lifestyle modifications alongside pharmacological treatment.