Mounjaro vs Orlistat UK: Which Works Better? | Cured

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Cheapest Mounjaro vs Orlistat UK Price £124.99

Compare Mounjaro and Orlistat with the cheapest UK price from £124.99 plus £20 off your first order using 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

£99 £79.00

£19.75 / Per Week

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

⭐ Future Orders at £99
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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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Mounjaro vs Orlistat UK Comparison

Published on: June 03, 2026

When evaluating mounjaro vs orlistat uk comparison options, understanding the fundamental differences between these two MHRA-licensed weight loss treatments is essential for making an informed choice. Mounjaro (tirzepatide) is a once-weekly injectable dual GIP/GLP-1 receptor agonist, whilst Orlistat is an oral lipase inhibitor taken three times daily with meals. Both require clinical assessment by a UK prescriber, but they work through entirely different mechanisms and produce significantly different results in clinical trials.

How Mounjaro and Orlistat Work Differently

Mounjaro contains tirzepatide, the first dual GIP/GLP-1 receptor agonist licensed by the MHRA for weight management [1]. It activates two natural hormone pathways that regulate appetite, slow gastric emptying, and improve insulin sensitivity. This dual mechanism produces substantial weight loss by reducing hunger signals and increasing feelings of fullness between meals.

Orlistat works through a completely different pathway. As a gastrointestinal lipase inhibitor, it blocks approximately 30% of dietary fat absorption in the intestines [2]. The unabsorbed fat is then eliminated through bowel movements. Unlike Mounjaro, Orlistat does not affect appetite hormones or brain signalling—it purely prevents fat digestion. This means patients must actively reduce dietary fat intake to minimise gastrointestinal side effects.

The mechanistic difference explains why clinical outcomes vary so significantly. Mounjaro addresses the neurological and hormonal drivers of obesity, whilst Orlistat requires strict dietary compliance and only affects one component of calorie absorption. Patients on Mounjaro typically report reduced cravings and natural portion control, whereas Orlistat users must consciously monitor fat intake to avoid treatment-related side effects.

Clinical Efficacy: Mounjaro vs Orlistat Weight Loss Results

In the SURPASS-3 trial, patients receiving the highest Mounjaro dose (15mg weekly) achieved an average body weight reduction of 22.5% over 72 weeks [1]. Even the lowest therapeutic dose (5mg weekly) produced average weight loss exceeding 15% of initial body weight. These results represent some of the most substantial weight reductions observed in obesity pharmacotherapy trials.

By contrast, Orlistat clinical trials demonstrate more modest outcomes. A comprehensive meta-analysis of Orlistat studies found average weight loss of 2.9kg more than placebo over 12 months, translating to approximately 3-5% additional body weight reduction when combined with dietary restriction [2]. Patients typically lose around 5-10% of their starting weight when Orlistat is combined with a reduced-calorie, low-fat diet.

The efficacy gap reflects both mechanism and adherence challenges. Mounjaro's once-weekly injection offers consistent pharmacological action regardless of meal timing, whilst Orlistat requires three doses daily with meals and strict fat restriction. Clinical experience shows that patients often discontinue Orlistat due to gastrointestinal side effects when dietary fat intake is not adequately controlled, whereas Mounjaro's side effect profile typically improves after the initial titration period.

Long-Term Weight Maintenance Outcomes

Long-term data from the SURMOUNT-4 trial demonstrated that patients who discontinued Mounjaro after achieving weight loss regained a significant portion of lost weight, whilst those continuing treatment maintained their reductions [3]. This highlights that Mounjaro, like other GLP-1 treatments, typically requires ongoing use for sustained benefit. Orlistat similarly requires continuous use, though the modest weight loss achieved may be easier to maintain through dietary changes alone once treatment stops.

Side Effects and Tolerability: What UK Patients Experience

Mounjaro's most common side effects are gastrointestinal and include nausea, diarrhoea, vomiting, and constipation, particularly during dose escalation [1]. These effects typically diminish after the first 4-8 weeks as the body adapts. Most UK prescribers start patients on the lowest dose (2.5mg weekly) and gradually increase every four weeks to minimise these symptoms. Serious side effects are rare but include potential thyroid concerns and pancreatitis risk, which is why thorough medical history screening is essential.

Orlistat's side effect profile is distinctly different and directly related to its mechanism. The most frequently reported effects include oily spotting, flatulence with discharge, urgent bowel movements, and fatty or oily stools [2]. These effects worsen when patients consume meals containing more than 15-20g of fat, creating a behavioural deterrent to high-fat eating. Some patients find these effects manageable with strict dietary control, whilst others find them socially limiting and discontinue treatment.

From a clinical perspective, Mounjaro's side effects are generally time-limited and improve with continued use, whereas Orlistat's effects persist throughout treatment whenever dietary fat intake is elevated. Patient preference often depends on whether they find temporary nausea or ongoing bowel-related effects more acceptable. Your UK prescriber will discuss your lifestyle, dietary habits, and tolerability concerns when recommending the most suitable option.

Managing Side Effects in Clinical Practice

For Mounjaro users, eating smaller portions, avoiding high-fat meals, and staying well-hydrated can significantly reduce nausea and gastrointestinal discomfort during the initial weeks. For Orlistat, maintaining a daily fat intake below 60-70g spread across three meals minimises treatment-related bowel effects. Our clinical team at Cured Pharmacy provides detailed guidance on managing side effects when you begin either treatment following prescriber approval.

Feature Mounjaro (Tirzepatide) Orlistat
Mechanism Dual GIP/GLP-1 receptor agonist Gastrointestinal lipase inhibitor
Administration Once-weekly injection Three times daily with meals
Average Weight Loss 15-22.5% body weight (72 weeks) 3-5% additional vs placebo (12 months)
Starting Price From £124.99 From £124.99
Common Side Effects Nausea, diarrhoea, vomiting (time-limited) Oily stools, flatulence, urgent bowel movements
BMI Eligibility ≥30 kg/m² or ≥27 kg/m² with comorbidity ≥28 kg/m²
Dietary Requirements No specific restrictions Low-fat diet essential (<20g fat per meal)

Mounjaro vs Orlistat: Suitability and Eligibility Criteria

Mounjaro is licensed in the UK for adults with a BMI of 30 kg/m² or above, or 27 kg/m² or above with at least one weight-related comorbidity such as hypertension, type 2 diabetes, or dyslipidaemia [4]. It is not suitable for patients with a personal or family history of medullary thyroid carcinoma, multiple endocrine neoplasia syndrome type 2, or severe gastrointestinal disease. Pregnancy and breastfeeding are contraindications, and patients planning pregnancy should discontinue treatment at least two months before conception.

Orlistat has broader eligibility and is available for adults with a BMI of 28 kg/m² or above, making it accessible to patients who do not meet the criteria for injectable treatments [2]. It is also suitable for patients who prefer oral medication or have contraindications to GLP-1 receptor agonists. However, Orlistat is not recommended for patients with chronic malabsorption syndrome, cholestasis, or those taking ciclosporin. It can also reduce absorption of fat-soluble vitamins, so supplementation may be advised.

Your UK prescriber will assess your full medical history, current medications, weight loss goals, and lifestyle factors during your online consultation. Patients with significant weight to lose and no contraindications to injectable treatments often achieve better outcomes with Mounjaro, whilst those seeking a more affordable oral option with modest goals may find Orlistat appropriate. Both treatments require commitment to dietary and lifestyle changes for optimal results.

Cost Comparison: Mounjaro vs Orlistat UK Pricing

At Cured Pharmacy, Mounjaro is available from £124.99 per month, with pricing varying based on your prescribed dose following clinical assessment. This includes your UK prescriber consultation, genuine UK-licensed medication, and discreet home delivery. Mounjaro represents a premium investment in weight management, reflecting its advanced dual-receptor mechanism and superior clinical efficacy demonstrated in trials.

Orlistat offers a more budget-friendly option for UK patients, with generic Orlistat capsules starting from £135.00 per month and branded Xenical from £135.00 at Cured Pharmacy. The lower cost makes it accessible for patients who may not meet funding criteria for injectable treatments or prefer to start with a less expensive option. However, the modest weight loss outcomes mean some patients later transition to more effective treatments if results are insufficient.

When evaluating cost-effectiveness, consider the magnitude of weight loss achieved. Mounjaro's significantly greater efficacy may justify the higher monthly cost for patients with substantial weight to lose or those who have not succeeded with oral treatments. Orlistat's affordability makes it a reasonable first-line option for patients with lower BMI or those seeking gradual, modest weight reduction. Your prescriber will discuss treatment costs transparently during your consultation, and all prices are shown upfront before you complete your clinical assessment.

NHS vs Private Prescription Costs

Both Mounjaro and Orlistat are available on NHS prescription in certain circumstances, typically through specialist weight management services with strict eligibility criteria. However, NHS availability varies significantly by region and often involves lengthy waiting times. Private prescription through UK-registered online pharmacies like Cured Pharmacy offers immediate access following clinical approval, with transparent pricing and convenient home delivery.

Which Treatment Is Right for You? Clinical Guidance

Choosing between Mounjaro and Orlistat depends on your individual circumstances, weight loss goals, medical history, and budget. Mounjaro is typically the preferred choice for patients seeking substantial weight loss (15-20% or more of body weight), those who have not achieved adequate results with oral treatments, or patients with obesity-related comorbidities requiring significant intervention. The once-weekly injection offers convenience and powerful appetite suppression that many patients find transformative.

Orlistat may be more suitable if you have a BMI in the lower obesity range (28-32 kg/m²), prefer oral medication, have contraindications to GLP-1 treatments, or are working with a tighter budget. It is also appropriate for patients who are willing to make significant dietary changes and can tolerate the gastrointestinal side effects associated with fat malabsorption. Some patients successfully use Orlistat as an initial treatment before progressing to injectable options if further weight loss is needed.

At Cured Pharmacy, our UK-registered prescribers assess your complete medical profile during your free online consultation, which takes under three minutes to complete. We offer both treatments with transparent upfront pricing, genuine UK-licensed medication, and discreet delivery. Whether you choose Mounjaro, Orlistat, or another weight loss treatment from our range, you will receive ongoing clinical support and guidance throughout your weight management journey.

Starting Your Weight Loss Treatment at Cured Pharmacy

Begin by completing our confidential online consultation, where you will answer questions about your medical history, current health status, and weight loss goals. A UK prescriber will review your assessment and determine the most appropriate treatment option. If approved, your medication is dispensed by our GPhC-registered pharmacy and delivered discreetly to your door. Our clinical team remains available for ongoing support, dose adjustments, and any questions throughout your treatment.

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. Rucker, D., Padwal, R., Li, S. K., Curioni, C., & Lau, D. C. (2007). Long term pharmacotherapy for obesity and overweight: updated meta-analysis. BMJ, 335(7631), 1194–1199. https://doi.org/10.1136/bmj.39385.413113.25 [accessed 13 August 2026]
  3. Aronne, L. J., Sattar, N., Horn, D. B., et al. (2024). Continued Treatment With Tirzepatide for Maintenance of Weight Reduction in Adults With Obesity: The SURMOUNT-4 Randomized Clinical Trial. JAMA, 331(1), 38–48. https://doi.org/10.1001/jama.2023.24945 [accessed 13 August 2026]
  4. Medicines and Healthcare products Regulatory Agency. (2023). Mounjaro 2.5 mg solution for injection in pre-filled pen - Summary of Product Characteristics. https://www.gov.uk/government/organisations/medicines-and-healthcare-products-regulatory-agency [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 treatment and lifestyle modifications.

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"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."

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"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

Is Mounjaro vs Orlistat more effective for weight loss in the UK?
Yes, Mounjaro demonstrates significantly greater weight loss in clinical trials, with average reductions of 15-22.5% body weight compared to Orlistat's 3-5% additional loss beyond placebo. However, suitability depends on your individual medical profile and requires UK prescriber assessment.
Can I switch from Orlistat to Mounjaro if I'm not losing enough weight?
Yes, many patients transition from Orlistat to Mounjaro if initial results are insufficient, subject to prescriber approval. Your UK clinician will assess whether you meet eligibility criteria for Mounjaro and discuss the transition process during your consultation.
Which has worse side effects: Mounjaro or Orlistat?
Both have different side effect profiles. Mounjaro commonly causes nausea and gastrointestinal effects that typically improve after 4-8 weeks, whilst Orlistat causes persistent bowel-related effects whenever dietary fat intake is elevated. Patient tolerability varies individually.
How much does Mounjaro vs Orlistat cost in the UK?
At Cured Pharmacy, Mounjaro starts from £124.99 per month whilst Orlistat starts from £135.00 per month. Final pricing depends on your prescribed dose and treatment duration following clinical assessment by a UK prescriber.
Do I need a prescription for Mounjaro or Orlistat in the UK?
Yes, both are prescription-only medications in the UK and require clinical assessment by a UK-registered prescriber. At Cured Pharmacy, you complete a free online consultation that takes under three minutes, and a prescriber reviews your suitability before dispensing.
Can I take Mounjaro and Orlistat together for faster weight loss?
Combining these treatments is not standard practice and would require specific prescriber approval based on your individual circumstances. Most UK clinicians recommend optimising results with a single treatment alongside diet and lifestyle changes before considering combination therapy.
How long does it take to see results with Mounjaro vs Orlistat?
Mounjaro users typically notice appetite reduction within the first week and measurable weight loss within 4-8 weeks, with maximum effects after several months of dose escalation. Orlistat users may see modest results within 2-4 weeks if adhering to a low-fat diet.
Which is better for long-term weight maintenance: Mounjaro or Orlistat?
Both require ongoing use for sustained weight loss, though Mounjaro produces greater initial weight reduction that may be more motivating for long-term adherence. Your UK prescriber will discuss maintenance strategies and treatment duration based on your individual response and goals.
How does Mounjaro compare to Orlistat for weight loss in the UK?
Mounjaro typically delivers greater weight loss than Orlistat, with clinical trials showing average losses of 15-22% body weight versus 5-10% with Orlistat. Mounjaro works by mimicking hormones that regulate appetite and blood sugar, while Orlistat blocks fat absorption. Cured Pharmacy offers both medications with full clinical support to help you choose the right option.
Is Mounjaro more expensive than Orlistat in the UK?
Yes, Mounjaro starts from £124.99 per month at Cured Pharmacy, while Orlistat is generally cheaper at around £30-50 monthly. However, many patients find Mounjaro's superior weight loss results and once-weekly injection more convenient than taking Orlistat capsules three times daily with meals.
Can I switch from Orlistat to Mounjaro through Cured Pharmacy?
Yes, you can switch from Orlistat to Mounjaro after a consultation with a Cured Pharmacy prescriber. Many patients transition to Mounjaro if Orlistat hasn't delivered sufficient weight loss or if they experience digestive side effects. Your prescriber will assess your suitability and ensure a safe transition between treatments.
Which is better for long-term weight management - Mounjaro or Orlistat?
Mounjaro generally shows better long-term weight maintenance due to its appetite-suppressing effects and once-weekly dosing schedule. Orlistat requires strict adherence to a low-fat diet and three daily doses, which some find harder to sustain. Cured Pharmacy provides ongoing support for both medications to maximise your success.
Do Mounjaro and Orlistat have different side effects in UK patients?
Yes, Mounjaro commonly causes nausea, reduced appetite, and occasional digestive upset, while Orlistat often causes oily stools, urgency, and flatulence if dietary fat isn't restricted. Both are generally well-tolerated when used correctly. Cured Pharmacy prescribers will discuss side effects during your consultation to help you make an informed choice.
Tarun Kumar, Prescribing Pharmacist

Medically reviewed by

Tarun Kumar, Prescribing Pharmacist (GPhC 2233073)

Reviewed on: June 03, 2026

Last reviewed: 13 August 2026

Last updated on 13 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 13 August 2026

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

Current version (13 August 2026)

Edited by: The Editorial Team

Medically reviewed by:

Tarun Kumar, GPhC No. 2233073, Prescribing Pharmacist


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