Not Losing Weight On Wegovy Vs Mounjaro - UK Comparison

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Wegovy vs Mounjaro - Compare Cheapest UK Prices

Compare Wegovy and Mounjaro at the cheapest UK prices from £124.99 — Save £20 off with code Weightlossnew.

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Pricing Disclaimer: Prices on some pages may not be up to date — the live pricing table below and pricing shown during consultation are official current prices and take precedence over any other figures on the site.

Mounjaro (Tirzepatide)
Weeks 1–4

2.5mg

1 pen • 4 Weeks

£145 £124.99

£31.25 / Per Week

Your starting dose – designed to help your body adjust gently to treatment

⭐ Future Orders at £145
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Mounjaro (Tirzepatide)
Weeks 5–8

5mg

1 pen • 4 Weeks

£179 £159.00

£39.75 / Per Week

First step up – builds on your progress as your body adapts to treatment

⭐ Future Orders at £179
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Mounjaro (Tirzepatide)
Weeks 9–12

7.5mg

1 pen • 4 Weeks

£220 £200.00

£50.00 / Per Week

Mid-range dose – for continued progression and enhanced results

⭐ Future Orders at £220
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Mounjaro (Tirzepatide)
Weeks 13–16

10mg

1 pen • 4 Weeks

£245 £225.00

£56.25 / Per Week

Higher strength dose – supports significant weight loss progress

⭐ Future Orders at £245
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Mounjaro (Tirzepatide)
Weeks 17–20

12.5mg

1 pen • 4 Weeks

£270 £250.00

£62.50 / Per Week

Advanced dose – for patients requiring stronger therapeutic effect

⭐ Future Orders at £270
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Mounjaro (Tirzepatide)
Weeks 21+

15mg

1 pen • 4 Weeks

£287 £267.00

£66.75 / Per Week

Maximum dose – the highest available strength for optimal results

⭐ Future Orders at £287
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Wegovy (Semaglutide)
Weeks 1–4

0.25mg

1 pen • 4 Weeks

£89 £69.00

£17.25 / Per Week

Your starting dose – eases your body into treatment with minimal side effects

⭐ Future Orders at £89
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Wegovy (Semaglutide)
Weeks 5–8

0.5mg

1 pen • 4 Weeks

£109 £89.00

£22.25 / Per Week

First step up – continues building tolerance for long-term success

⭐ Future Orders at £109
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Wegovy (Semaglutide)
Weeks 9–12

1mg

1 pen • 4 Weeks

£119 £99.00

£24.75 / Per Week

Mid-range dose – where most patients start seeing meaningful results

⭐ Future Orders at £119
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Wegovy (Semaglutide)
Weeks 13–16

1.7mg

1 pen • 4 Weeks

£169 £149.00

£37.25 / Per Week

Higher strength – supports accelerated weight loss progress

⭐ Future Orders at £169
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Wegovy (Semaglutide)
Weeks 17+

2.4mg

1 pen • 4 Weeks

£199 £179.00

£44.75 / Per Week

Maximum dose – the highest available strength for optimal weight management

⭐ Future Orders at £199
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Wegovy (Oral Pill)
Weeks 1–4

1.5mg

1 pen • 4 Weeks

£83.00 £63.00

£20.75 / Per Week

Your starting dose – eases your body into treatment with minimal side effects

⭐ Future Orders at £83.00
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Wegovy (Oral Pill)
Weeks 5–8

4mg

1 pen • 4 Weeks

£110.00 £90.00

£27.50 / Per Week

First step up – continues building tolerance for long-term success

⭐ Future Orders at £110.00
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Wegovy (Oral Pill)
Weeks 9–12

9mg

1 pen • 4 Weeks

£140.00 £120.00

£35.00 / Per Week

Mid-range dose – where most patients start seeing meaningful results

⭐ Future Orders at £140.00
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Wegovy (Oral Pill)
Weeks 13+

25mg

1 pen • 4 Weeks

£199.00 £179.00

£49.75 / Per Week

Maximum dose – the highest available strength for optimal weight management

⭐ Future Orders at £199.00
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Not Losing Weight On Wegovy Vs Mounjaro: A Clinical Comparison

If you're not losing weight on Wegovy vs Mounjaro as expected, understanding the pharmacological differences between these GLP-1 receptor agonists is essential. Semaglutide (Wegovy) and tirzepatide (Mounjaro) demonstrate distinct mechanisms of action, with clinical trials showing variable individual responses that may explain weight loss plateaus. Our UK-registered clinical team at Cured Pharmacy provides expert assessment to help you optimise your treatment pathway.

Why You're Not Losing Weight On Wegovy Vs Mounjaro: Understanding Individual Response

When patients report not losing weight on Wegovy vs Mounjaro, the explanation often lies in individual metabolic variation and receptor sensitivity. Wegovy (semaglutide) acts solely as a GLP-1 receptor agonist, whilst Mounjaro (tirzepatide) uniquely targets both GLP-1 and GIP receptors, creating a dual incretin effect [1]. This dual mechanism may produce superior weight reduction in certain patient populations, particularly those with insulin resistance or metabolic syndrome.

Clinical trial data from the STEP programme showed that approximately 15-20% of Wegovy patients achieved less than 5% total body weight loss, whilst the SURPASS-2 head-to-head trial demonstrated tirzepatide's superior efficacy across all dose comparisons [2]. However, individual response depends on numerous factors including baseline insulin sensitivity, genetic polymorphisms affecting GLP-1 receptor expression, dietary adherence, and concurrent medication use. If you're experiencing a weight loss plateau on Wegovy, switching to Mounjaro may offer enhanced results through its additional GIP receptor activation, though this requires clinical assessment by a UK prescriber.

Pharmacological Differences: Not Losing Weight On Wegovy Vs Mounjaro Mechanisms

The pharmacological distinction between not losing weight on Wegovy vs Mounjaro centres on receptor selectivity and downstream metabolic effects. Semaglutide demonstrates 94% homology to native human GLP-1 and primarily reduces appetite through hypothalamic pathways, delays gastric emptying, and improves glycaemic control [3]. Tirzepatide's dual agonism adds GIP receptor activation, which enhances insulin secretion, reduces glucagon more effectively, and may improve adipocyte function and energy expenditure.

Patients not responding optimally to Wegovy may benefit from Mounjaro's enhanced insulinotropic effect and greater impact on postprandial glucose excursions. The SURPASS-2 trial directly compared 15mg tirzepatide against 1mg semaglutide, showing mean weight reductions of 12.4kg versus 6.2kg respectively at 40 weeks [2]. This pharmacological advantage stems from GIP's complementary action on pancreatic beta cells and potential effects on central appetite regulation distinct from GLP-1 pathways alone.

Dose Escalation and Therapeutic Ceiling

When evaluating not losing weight on Wegovy vs Mounjaro, dose optimisation plays a critical role. Wegovy's maximum licensed dose is 2.4mg weekly, whilst Mounjaro escalates to 15mg weekly, offering greater dose flexibility for non-responders. Some patients reach a therapeutic ceiling with semaglutide where further dose increases yield diminishing returns, whereas tirzepatide's higher dosing range may overcome this limitation. Our superintendent pharmacist Tarun Kumar regularly assesses patients for appropriate dose titration based on individual tolerance and weight loss trajectory.

Clinical Evidence: Not Losing Weight On Wegovy Vs Mounjaro Trial Data

Robust clinical evidence comparing not losing weight on Wegovy vs Mounjaro outcomes comes from the SURPASS-2 trial, the only head-to-head comparison of these agents. At 40 weeks, tirzepatide 5mg, 10mg, and 15mg produced weight reductions of 7.6kg, 9.3kg, and 11.2kg respectively, compared to 5.7kg with semaglutide 1mg [2]. Importantly, the proportion of patients achieving ≥15% weight loss was significantly higher across all tirzepatide doses (27-40%) versus semaglutide (19%).

The STEP 1 trial demonstrated that Wegovy 2.4mg produced average weight loss of 14.9% at 68 weeks, whilst SURMOUNT-1 showed Mounjaro 15mg achieved 20.9% reduction at 72 weeks [4]. These trials used similar patient populations (BMI ≥30 or ≥27 with comorbidities), making comparisons meaningful. For patients not losing weight on Wegovy vs Mounjaro, these data suggest tirzepatide may offer superior efficacy, though individual response varies and both medications require lifestyle modification for optimal results.

Responder Analysis and Predictive Factors

Post-hoc analyses of patients not losing weight on Wegovy vs Mounjaro reveal predictive factors for treatment response. Higher baseline HbA1c, greater insulin resistance (measured by HOMA-IR), and elevated triglycerides correlate with better relative response to tirzepatide's dual incretin action [1]. Conversely, patients with primarily hypothalamic-driven appetite dysregulation may respond adequately to Wegovy's GLP-1-only mechanism. Genetic studies suggest variations in GLP-1 receptor genes may predict semaglutide response, though routine genetic testing is not yet standard practice in UK weight management services.

Treatment Active Ingredient Mechanism Starting Price
Wegovy Injection Semaglutide GLP-1 agonist From £89.00
Mounjaro Injection Tirzepatide GLP-1/GIP dual agonist From £145.00
Wegovy Oral Tablet Semaglutide GLP-1 agonist From £83.00
Saxenda Liraglutide GLP-1 agonist From £68.00

Switching Strategy: Not Losing Weight On Wegovy Vs Mounjaro Transition Protocol

For patients not losing weight on Wegovy vs Mounjaro, switching between these medications requires careful clinical planning. The recommended protocol involves discontinuing semaglutide and initiating tirzepatide at the standard 2.5mg starting dose, regardless of prior Wegovy dose, to minimise gastrointestinal adverse effects [5]. Cross-tolerance between GLP-1 receptor agonists means some patients experience reduced side effects when switching, whilst others may encounter renewed nausea during the transition period.

Our UK-registered prescribers assess switching suitability based on several criteria: duration of Wegovy treatment (minimum 12-16 weeks at maintenance dose), documented weight loss plateau (less than 2% body weight change over 8 weeks), medication adherence, and concurrent lifestyle modification efforts. Switching is not appropriate for patients who have not optimised dietary intake or physical activity, as no medication overcomes poor lifestyle adherence. The transition typically shows renewed weight loss within 4-8 weeks if tirzepatide's dual mechanism addresses the underlying cause of Wegovy non-response.

Cost Considerations: Not Losing Weight On Wegovy Vs Mounjaro UK Pricing

When evaluating not losing weight on Wegovy vs Mounjaro, cost-effectiveness becomes relevant for UK patients paying privately. At Cured Pharmacy, Wegovy starts from £124.99 whilst Mounjaro begins at £124.99, with pricing varying by dose strength. New patients receive £20 off their first order using code Weightlossnew, making initial treatment more accessible. These represent the cheapest UK prices for genuine licensed medications, with transparent upfront pricing before consultation.

Cost-per-kilogram weight loss calculations from clinical trials suggest tirzepatide may offer superior value despite higher absolute cost, particularly at higher doses where the efficacy gap widens [4]. However, individual financial circumstances and response patterns determine optimal value. Some patients achieve excellent results with Wegovy at lower cost, whilst others require Mounjaro's enhanced efficacy to reach clinically meaningful weight reduction (≥5% body weight). Our clinical team provides personalised cost-benefit analysis during your assessment.

NHS Availability and Private Prescription Pathways

NHS England currently restricts both Wegovy and Mounjaro to specialist weight management services due to supply constraints and NICE guidance limitations, creating extended waiting lists for eligible patients. Private prescription through UK-registered pharmacies like Cured Pharmacy offers immediate access following clinical assessment by our prescribers. All patients complete a comprehensive medical questionnaire reviewed by GPhC-registered clinicians, ensuring safe prescribing aligned with MHRA licensing and contraindication screening. This pathway suits patients not losing weight on Wegovy vs Mounjaro who require timely treatment optimisation without prolonged NHS waiting periods.

Optimising Outcomes: Not Losing Weight On Wegovy Vs Mounjaro Lifestyle Factors

Addressing not losing weight on Wegovy vs Mounjaro requires examining lifestyle factors that influence medication efficacy. Both semaglutide and tirzepatide amplify the weight loss achieved through caloric restriction, but cannot overcome persistent caloric surplus. Clinical trials mandated 500kcal daily deficits and regular physical activity, yet real-world adherence often falls short [3]. Patients experiencing plateaus should review dietary intake with particular attention to liquid calories, ultra-processed foods, and portion sizes that may have gradually increased during treatment.

Protein intake deserves special consideration when not losing weight on Wegovy vs Mounjaro, as inadequate protein (less than 1.2g per kg ideal body weight) can reduce metabolic rate and lean muscle preservation during weight loss. Resistance training twice weekly helps maintain muscle mass, supporting sustained metabolic rate even as total body weight decreases. Sleep quality, stress management, and certain medications (including some antidepressants, antipsychotics, and corticosteroids) significantly impact weight loss trajectory regardless of GLP-1 or dual incretin therapy. Our clinical team at Cured Pharmacy assesses these factors during consultation, providing holistic guidance beyond medication selection alone.

Scientific References

  1. Frias, J. P., Davies, M. J., Rosenstock, J., et al. (2021). Tirzepatide versus semaglutide once weekly in patients with type 2 diabetes. New England Journal of Medicine, 385(6), 503-515. [accessed 15 August 2026]
  2. Frías, J. P., Davies, M. J., Rosenstock, J., et al. (2021). Tirzepatide versus semaglutide once weekly in patients with type 2 diabetes (SURPASS-2): a randomised, open-label, phase 3 trial. The Lancet, 398(10295), 64-77. [accessed 15 August 2026]
  3. Wilding, J. P., Batterham, R. L., Calanna, S., et al. (2021). Once-weekly semaglutide in adults with overweight or obesity. New England Journal of Medicine, 384(11), 989-1002. [accessed 15 August 2026]
  4. 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. [accessed 15 August 2026]
  5. Medicines and Healthcare products Regulatory Agency. (2023). Summary of Product Characteristics: Mounjaro 2.5mg solution for injection. MHRA UK. [accessed 15 August 2026]
  6. NHS. (2026). Tirzepatide: a medicine to manage type 2 diabetes and treat obesity. https://www.nhs.uk/medicines/tirzepatide/ Accessed 15 August 2026.
  7. NHS. (2026). Overweight and obesity in adults. https://www.nhs.uk/conditions/overweight-and-obesity/ Accessed 15 August 2026.
  8. NHS England. (2026). Weight management injections. https://www.england.nhs.uk/ourwork/prevention/obesity/medicines-for-obesity/weight-management-injections/ Accessed 15 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.

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Jane L.

"Brilliant. Lost 4 stone on mounjaro no side effects at all. Cured pharmacy are excellent. Always helpful pens sent out quickly always comes with needles and sterile wipes. If you want to go on GLP-1 go to cured pharmacy. So professional. Thank you cured pharmacy you changed my health and well being."

Ann-Marie

"I absolutely love this product, I have been using 2.5mg as maintenance dose and have managed to control my weight without any side effects and can still eat well balanced meals. The pharmacy is very efficient friendly and helpful I would not purchase from anywhere else."

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"So far I'm really impressed by my results it's crazy cause I'm not snacking like how I used to do and I see my face slimming down already and it's only been 2 and a half weeks. Can't wait to give my feedback in 5 months time thank you cured pharmacy."

Kimberly G.

"Mounjaro has corrected my hormonal weight gain during menopause. I am using it now to maintain that balance. The results for me have been exceptional!"

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Faq

Why am I not losing weight on Wegovy vs Mounjaro?
Individual response varies due to genetic factors, receptor sensitivity, and metabolic differences. Mounjaro's dual GLP-1/GIP mechanism may produce better results in patients with insulin resistance who respond inadequately to Wegovy's GLP-1-only action, though both require lifestyle modification for optimal efficacy.
How long should I try Wegovy before switching to Mounjaro?
UK prescribers typically recommend 12-16 weeks at maintenance dose (2.4mg weekly) before considering switching. If weight loss plateaus below 5% total body weight despite good adherence and lifestyle efforts, Mounjaro may offer enhanced results through its additional GIP receptor activation.
Is Mounjaro more effective than Wegovy for weight loss?
Head-to-head SURPASS-2 trial data showed tirzepatide 15mg produced significantly greater weight loss (11.2kg) compared to semaglutide 1mg (5.7kg) at 40 weeks. However, individual response varies, and some patients achieve excellent results with Wegovy at lower cost.
Can I switch from Wegovy to Mounjaro on the NHS?
NHS access to both medications remains limited to specialist weight management services with strict eligibility criteria. Private prescription through UK-registered pharmacies like Cured Pharmacy offers immediate switching options following clinical assessment, with Mounjaro from £124.99 and £20 off first orders using code Weightlossnew.
What side effects differ between not losing weight on Wegovy vs Mounjaro?
Both cause similar gastrointestinal effects (nausea, diarrhoea, constipation), though Mounjaro's dual mechanism may produce slightly higher rates of nausea at equivalent weight loss. Most side effects resolve within 4-8 weeks of dose stabilisation with either medication.
Will I regain weight if I switch from Wegovy to Mounjaro?
Switching between GLP-1 receptor agonists does not typically cause weight regain if done correctly. Starting Mounjaro at 2.5mg after discontinuing Wegovy maintains appetite suppression during transition, with renewed weight loss typically occurring within 4-8 weeks as tirzepatide doses escalate.
Do I need to restart from the lowest dose when switching to Mounjaro?
Yes, clinical guidance recommends starting Mounjaro at 2.5mg regardless of prior Wegovy dose to minimise gastrointestinal side effects. The standard 4-week escalation protocol (2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg) allows tolerance development whilst maintaining efficacy.
How much does switching from Wegovy to Mounjaro cost in the UK?
At Cured Pharmacy, Mounjaro starts from £124.99 compared to Wegovy from £124.99, representing the cheapest UK prices for licensed medications. New patients Save £20 with code Weightlossnew, and all prescriptions include free UK-registered clinical assessment and discreet next-day delivery.
Tarun Kumar, Prescribing Pharmacist

Medically reviewed by

Tarun Kumar, Prescribing Pharmacist (GPhC 2233073)

Reviewed on: June 03, 2026

Last reviewed: 15 August 2026

Last updated on 15 August 2026.

Review History

Our experts continually monitor new findings in health and medicine, and we update our articles when new information becomes available.

Why this page was updated on 15 August 2026

Content checked and updated as part of our periodic review, to ensure accuracy and currentness.

Current version (15 August 2026)

Edited by: The Editorial Team

Medically reviewed by:

Tarun Kumar, GPhC No. 2233073, Prescribing Pharmacist


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