Mysimba or Mounjaro Science Explained | Cured Pharmacy

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Mysimba or Mounjaro - Cheapest UK Price From £124.99

Compare Mysimba and Mounjaro at the cheapest UK price from £124.99 plus £20 off your first order with code Weightlossnew.

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£145.00 From £124.99 £10 discount using discount code Weightlossnew
LIVE PRICING

Our Pricing

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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The Science Behind Mysimba Or Mounjaro

Choosing between Mysimba or Mounjaro for weight loss UK treatment depends on understanding how each medication works at a cellular level. At Cured Pharmacy, our UK-registered clinical team helps patients navigate these evidence-based options through a free online consultation, ensuring you receive the treatment best suited to your medical history and weight management goals.

How Mounjaro Works: Dual Receptor Mechanism

Mounjaro contains tirzepatide, the first dual GIP/GLP-1 receptor agonist licensed by the MHRA for weight management in the UK [1]. Unlike single-pathway treatments, tirzepatide simultaneously activates glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) receptors, producing complementary metabolic effects that regulate appetite, slow gastric emptying, and improve insulin sensitivity.

In the SURMOUNT-1 trial, participants receiving the 15mg maintenance dose achieved an average 22.5% body weight reduction over 72 weeks — the highest efficacy demonstrated in obesity pharmacotherapy to date [1]. The dual mechanism appears to produce greater weight loss than GLP-1-only medications, with 63% of patients achieving at least 20% weight reduction at the highest dose. Mounjaro is administered as a once-weekly subcutaneous injection, with dosing escalated gradually from 2.5mg to minimise gastrointestinal side effects.

At Cured Pharmacy, Mounjaro is available from £124.99 following assessment by a UK prescriber. The medication requires a prescription and is suitable for adults with a BMI of 30 or above, or 27 or above with weight-related comorbidities, subject to clinical approval [2].

How Mysimba Works: Central Appetite Regulation

Mysimba combines two established medications — naltrexone (an opioid receptor antagonist) and bupropion (a dopamine and noradrenaline reuptake inhibitor) — to target appetite centres in the hypothalamus and reward pathways in the mesolimbic system [3]. This dual-action oral tablet modulates neurochemical signals that control hunger, food cravings, and eating behaviour, without affecting GLP-1 or GIP receptors.

Clinical trials showed that Mysimba produced an average weight loss of 5-10% over 56 weeks when combined with lifestyle modification, with the medication working primarily through reduced caloric intake rather than metabolic changes [3]. Unlike injectable GLP-1 treatments, Mysimba is taken as two tablets twice daily, with dosing titrated over four weeks to improve tolerability. Common side effects include nausea, constipation, headache, and dizziness, typically diminishing after the first month of treatment.

Mysimba is not currently stocked at Cured Pharmacy, but our clinical team can recommend alternative oral weight loss treatments such as Orlistat (from £135.00) or injectable options like Wegovy and Saxenda. All prescription medications require assessment by a UK-registered prescriber to ensure clinical appropriateness and safety.

Comparing Mysimba or Mounjaro: Efficacy and Clinical Outcomes

Weight Loss Efficacy

Head-to-head trials directly comparing Mysimba and Mounjaro have not been conducted, but indirect evidence from separate clinical programmes provides useful context. Mounjaro demonstrated superior weight loss in the SURMOUNT trials (average 15-22.5% reduction depending on dose) compared to Mysimba's COR trials (average 5-10% reduction) [1][3]. The difference likely reflects Mounjaro's dual incretin mechanism producing both metabolic and appetite effects, whereas Mysimba works exclusively through central nervous system pathways.

For patients seeking maximal weight reduction and willing to use injectable therapy, Mounjaro typically produces greater clinical outcomes. For those preferring oral medication or with contraindications to GLP-1 treatments (such as personal or family history of medullary thyroid carcinoma), Mysimba or other oral options may be more appropriate, subject to prescriber assessment.

Feature Mounjaro (Tirzepatide) Mysimba Wegovy (Semaglutide)
Mechanism Dual GIP/GLP-1 receptor agonist Naltrexone/bupropion combination GLP-1 receptor agonist
Administration Once-weekly injection Twice-daily oral tablet Once-weekly injection
Average Weight Loss 15-22.5% (72 weeks) 5-10% (56 weeks) 12-15% (68 weeks)
Starting Price at Cured From £124.99 Not currently stocked From £124.99
Common Side Effects Nausea, diarrhoea, vomiting Nausea, headache, dizziness Nausea, diarrhoea, constipation

Administration and Practical Considerations

Injection vs Oral Therapy

Mounjaro requires a once-weekly subcutaneous injection using a pre-filled KwikPen device, which many patients find convenient compared to daily dosing schedules. The injection is administered into the abdomen, thigh, or upper arm, and most patients report minimal discomfort after initial training. Dose escalation follows a structured protocol (2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, 15mg) over several months to optimise tolerability [2].

Mysimba is taken as oral tablets twice daily with food, eventually reaching a maintenance dose of two tablets twice daily (total 32mg naltrexone/360mg bupropion per day). Some patients prefer oral therapy to avoid injections, though adherence to twice-daily dosing can be challenging. The medication should not be crushed or split, and alcohol consumption should be minimised due to potential neuropsychiatric effects [3].

Side Effects and Safety Profiles

Mounjaro's most common side effects are gastrointestinal: nausea (occurring in 20-30% of patients), diarrhoea, vomiting, constipation, and abdominal discomfort [1]. These effects are typically mild to moderate, most pronounced during dose escalation, and often resolve within 4-8 weeks. Rare but serious risks include pancreatitis, gallbladder disease, and hypoglycaemia (particularly in patients taking insulin or sulfonylureas). Mounjaro is contraindicated in patients with personal or family history of medullary thyroid carcinoma or multiple endocrine neoplasia syndrome type 2.

Mysimba's side effect profile differs significantly, with nausea, constipation, headache, dizziness, insomnia, and dry mouth reported most frequently [3]. The medication carries a black box warning in some jurisdictions regarding neuropsychiatric effects, including mood changes, depression, and suicidal ideation, particularly during the first few weeks of treatment. Mysimba is contraindicated in patients with uncontrolled hypertension, seizure disorders, eating disorders, or those taking MAO inhibitors. Blood pressure monitoring is recommended during treatment initiation.

Both medications require comprehensive medical screening before prescribing. At Cured Pharmacy, our UK prescribers review your full medical history, current medications, and contraindications during the online consultation to ensure any recommended treatment is clinically appropriate and safe for your individual circumstances.

Choosing Between Mysimba or Mounjaro for Weight Loss UK

Clinical Decision Factors

Your suitability for Mysimba or Mounjaro depends on multiple factors including BMI, weight loss goals, medical history, medication preferences, and contraindications. Patients seeking the highest efficacy weight loss and comfortable with weekly injections may be better suited to Mounjaro, while those preferring oral therapy or with contraindications to GLP-1 medications might consider Mysimba or alternatives like Orlistat.

At Cured Pharmacy, our UK-registered prescribers assess your individual clinical profile during a free online consultation taking under three minutes. We offer transparent upfront pricing on all weight loss treatments, with Mounjaro available from £124.99, Wegovy from £135.00, Saxenda from £135.00, and Orlistat from £135.00. All medications are UK-licensed, dispensed by our GPhC-registered pharmacy (9012511), and delivered in discreet packaging. Superintendent pharmacist Tarun Kumar (GPhC 2233073) oversees all clinical services to ensure the highest standards of patient safety and care.

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
  2. Medicines and Healthcare products Regulatory Agency. (2023). Mounjaro 2.5 mg solution for injection in pre-filled pen: Summary of Product Characteristics. MHRA. https://www.gov.uk/
  3. Greenway, F. L., Fujioka, K., Plodkowski, R. A., et al. (2010). Effect of naltrexone plus bupropion on weight loss in overweight and obese adults (COR-I): a multicentre, randomised, double-blind, placebo-controlled, phase 3 trial. The Lancet, 376(9741), 595–605. https://doi.org/10.1016/S0140-6736(10)60888-4

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. Weight loss results vary between individuals and depend on adherence to lifestyle modification alongside pharmacotherapy.

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Faq

Which is better for weight loss, Mysimba or Mounjaro?
Clinical trial data suggests Mounjaro produces greater average weight loss (15-22.5%) compared to Mysimba (5-10%), though individual results vary and both require lifestyle modification. Your UK prescriber will recommend the most appropriate option based on your medical history and preferences.
Can I take Mysimba and Mounjaro together?
No. These medications should not be combined without explicit guidance from a specialist, as they work through different mechanisms and combining weight loss treatments increases the risk of side effects and complications.
Is Mounjaro available without a prescription in the UK?
No. Mounjaro is a prescription-only medication regulated by the MHRA and requires assessment by a UK-registered prescriber before it can be legally dispensed.
How long does it take for Mysimba or Mounjaro to work?
Mounjaro patients typically notice appetite reduction within 1-2 weeks, with measurable weight loss by 4-8 weeks. Mysimba may take 4-12 weeks to produce noticeable effects, with optimal results after 6 months of continuous use.
What is the price difference between Mysimba and Mounjaro UK?
Mounjaro starts from £124.99 at Cured Pharmacy. Mysimba is not currently stocked, but alternative oral treatments like Orlistat are available from £135.00, subject to prescriber approval.
Can I switch from Mysimba to Mounjaro or vice versa?
Yes, switching between weight loss medications is possible under prescriber supervision. A washout period may be recommended, and your UK clinician will assess whether the new medication is clinically appropriate for your circumstances.
Do Mysimba or Mounjaro work without diet and exercise?
Both medications are licensed as adjuncts to reduced-calorie diet and increased physical activity, not replacements. Clinical trial results were achieved in combination with lifestyle modification, and outcomes are significantly better when medications are used alongside behavioural changes.
Are Mysimba or Mounjaro safe for long-term use?
Mounjaro has been studied for up to 72 weeks in clinical trials with acceptable safety profiles. Mysimba has been evaluated for similar durations. Long-term safety beyond trial periods is still being monitored through post-marketing surveillance, and regular prescriber reviews are recommended.
Is Mounjaro or Mysimba better for weight loss in the UK?
Mounjaro typically produces greater weight loss than Mysimba, with clinical trials showing around 15-20% body weight reduction versus 5-10% with Mysimba. Cured Pharmacy can help you determine which option suits your health profile and weight loss goals during your online consultation.
Can I switch from Mysimba to Mounjaro for weight loss?
Yes, you can switch from Mysimba to Mounjaro after discussing with a prescriber to ensure it's safe and appropriate for you. Cured Pharmacy offers consultations to assess your suitability for Mounjaro and guide you through the transition process.
How much does Mysimba cost compared to Mounjaro in the UK?
Mysimba typically costs around £50-£80 per month, while Mounjaro starts from £124.99 per month at Cured Pharmacy. Although Mounjaro has a higher upfront cost, many patients find the superior weight loss results justify the investment.
Does Mounjaro require injections while Mysimba is a tablet?
Yes, Mounjaro is a once-weekly injection while Mysimba is taken as oral tablets twice daily. Cured Pharmacy provides full injection training and support materials to help you feel confident administering Mounjaro at home.
Can I use a discount code for Mysimba or Mounjaro at Cured Pharmacy?
Yes, Cured Pharmacy offers £20 off your first order of Mounjaro with code Weightlossnew, bringing your starting price to £104.99. This discount helps make effective weight loss treatment more affordable when you begin your journey with us.
Tarun Kumar, Prescribing Pharmacist

Medically reviewed by

Tarun Kumar, Prescribing Pharmacist (GPhC 2233073)

Last reviewed: 17 July 2026