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Combining Mysimba and Orlistat: Clinical Guidance for UK Patients

Published on: June 03, 2026

Many UK patients ask can you take Mysimba and orlistat together UK to maximise weight loss results. While both medications are MHRA-licensed for weight management, combining them requires careful clinical assessment by a UK prescriber. At Cured Pharmacy, our clinical team evaluates your individual circumstances to determine whether dual therapy is appropriate and safe for you.

Can You Take Mysimba and Orlistat Together UK: The Clinical Evidence

Mysimba (naltrexone/bupropion) and Orlistat work through completely different mechanisms, which theoretically makes combination therapy possible. Mysimba acts centrally on the hypothalamus and mesolimbic reward system to reduce appetite and food cravings, whilst Orlistat works peripherally in the digestive system to block approximately 30% of dietary fat absorption [1].

There is limited published research specifically examining the combination of these two medications. However, because they do not share metabolic pathways or contraindications, many UK prescribers may consider dual therapy for patients who have not achieved adequate weight loss with monotherapy [2]. The decision must be made on an individual basis following thorough clinical assessment.

In clinical practice, some prescribers adopt a sequential approach—starting with one medication and adding the second only if weight loss plateaus after 12-16 weeks. This strategy allows proper monitoring of tolerability and side effects from each medication separately before combining them [3].

How Mysimba and Orlistat Work Differently

Understanding the distinct mechanisms helps explain why combination therapy might be considered. Mysimba contains two active ingredients: naltrexone (an opioid antagonist) and bupropion (a norepinephrine-dopamine reuptake inhibitor). Together, they modulate neural pathways controlling appetite, reducing hunger signals and diminishing reward responses to food [1].

Orlistat, by contrast, is a gastrointestinal lipase inhibitor. It prevents the breakdown and absorption of dietary fats in the small intestine, meaning approximately one-third of fat consumed passes through undigested. This creates a calorie deficit and encourages patients to adopt lower-fat eating patterns to avoid gastrointestinal side effects [4].

Because one medication works in the brain and the other in the gut, there is no direct pharmacological interaction. However, both medications can cause side effects that may be amplified when used together, which is why prescriber supervision is essential.

Complementary Mechanisms for Weight Loss

The complementary nature of these mechanisms means that patients struggling with both appetite control and dietary fat intake might theoretically benefit from dual therapy. Mysimba addresses the psychological and neurological aspects of eating behaviour, whilst Orlistat provides a mechanical barrier to fat absorption and reinforces dietary discipline through immediate gastrointestinal feedback when high-fat foods are consumed.

Safety Considerations When Combining Mysimba and Orlistat

Whilst there are no known direct drug interactions between Mysimba and Orlistat, each medication carries its own contraindications and side effect profile that must be carefully evaluated. Mysimba is contraindicated in patients with uncontrolled hypertension, seizure disorders, eating disorders, or those taking opioid medications [1].

Orlistat's main concern relates to fat-soluble vitamin deficiency with long-term use, as it reduces absorption of vitamins A, D, E, and K. Patients on combination therapy would need monitoring for nutritional deficiencies and may require supplementation taken at least two hours apart from Orlistat [4].

Common side effects of Mysimba include nausea, constipation, headache, and increased blood pressure, whilst Orlistat typically causes oily stools, faecal urgency, and flatulence with oily discharge—particularly when dietary fat intake is high. When both medications are used together, the overall side effect burden may be significant, which is why close monitoring by your prescriber is crucial.

Who Should Not Combine These Medications

Combination therapy is not suitable for everyone. Patients with cardiovascular disease, hepatic impairment, renal disease, or those taking multiple other medications require particularly careful assessment. Pregnant or breastfeeding women must not use either medication. Your UK prescriber will review your complete medical history and current medications before approving any weight loss treatment, whether monotherapy or combination therapy.

Treatment Type Mechanism Frequency Starting Price
Mysimba Oral tablet Appetite suppression (CNS) Twice daily From £125.95
Orlistat Oral capsule Fat absorption blocker Three times daily From £32.00
Mounjaro Injectable Dual GIP/GLP-1 agonist Once weekly From £124.99
Wegovy Injectable GLP-1 receptor agonist Once weekly From £69.00
Saxenda Injectable GLP-1 receptor agonist Once daily From £68.00

Alternative Weight Loss Treatments Available at Cured Pharmacy

For patients seeking more effective weight loss outcomes, GLP-1 receptor agonists represent the current gold standard in pharmacological weight management. Medications like Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide) have demonstrated superior weight loss results compared to older oral medications in head-to-head trials [5].

In the SURMOUNT-1 trial, patients taking the highest dose of Mounjaro achieved an average weight reduction of 22.5% over 72 weeks—substantially greater than the 5-10% typically seen with Mysimba or Orlistat monotherapy [5]. Similarly, the STEP trials showed semaglutide (Wegovy) produced average weight loss of 14.9% at 68 weeks [6].

These injectable medications work by mimicking natural gut hormones that regulate appetite, slow gastric emptying, and improve insulin sensitivity. Whilst they require weekly or daily injections and come at a higher cost, many patients find the superior efficacy and once-weekly convenience preferable to taking multiple oral medications daily with potentially challenging side effects.

Choosing the Right Treatment Pathway

Your treatment choice should be guided by your individual circumstances, medical history, weight loss goals, and tolerance for side effects. Our UK clinical team at Cured Pharmacy will discuss all available options during your free consultation, including monotherapy with Mysimba or Orlistat, combination approaches, or newer GLP-1 medications. All prescription treatments require clinical approval and ongoing monitoring to ensure safety and effectiveness.

What to Expect During Your Clinical Assessment

If you're considering combining Mysimba and Orlistat, your online consultation with a UK prescriber will cover several key areas. You'll be asked about your weight loss history, previous treatments tried, current medications, medical conditions (particularly cardiovascular, neurological, and gastrointestinal), and your dietary habits.

Your prescriber will calculate your BMI and assess whether you meet the clinical criteria for prescription weight loss medication—typically a BMI of 30 kg/m² or above, or 27 kg/m² with weight-related comorbidities such as type 2 diabetes or hypertension. They will also discuss realistic expectations, as clinical guidelines recommend targeting 5-10% body weight reduction over 6-12 months with lifestyle modifications and medication [2].

If combination therapy is approved, your prescriber will provide detailed guidance on dosing schedules, managing side effects, and when to seek medical advice. They may recommend starting with one medication and adding the second after 4-8 weeks, allowing your body to adjust gradually. Regular follow-up assessments will be scheduled to monitor your progress, blood pressure, and any adverse effects.

Pricing and Accessing Treatment at Cured Pharmacy

At Cured Pharmacy, we offer transparent upfront pricing for all weight loss medications. Orlistat is available from £135.00, whilst Mysimba Tablets start from £135.00. If your prescriber approves combination therapy, you would need to purchase both medications, though some patients find this approach more cost-effective than newer injectable treatments.

All our weight loss treatments include a free online consultation with a UK-registered prescriber, which takes under three minutes to complete. Unlike some providers, we show you the exact price before you begin your consultation, so there are no surprises. Once approved, your medication is dispensed by our GPhC-registered pharmacy (registration number 9012511) under the supervision of Superintendent Pharmacist Tarun Kumar (GPhC 2233073).

We guarantee the lowest prices in the UK and offer completely discreet packaging with fast delivery. Every medication is genuine and UK-licensed, sourced directly from reputable manufacturers. Whether you're considering Mysimba, Orlistat, or exploring alternatives like Mounjaro or Wegovy, our clinical team is here to guide you towards the most appropriate and effective treatment for your individual needs.

Scientific References

  1. Apovian, C. M., et al. (2013). Naltrexone/bupropion for the treatment of obesity: A randomized, double-blind, placebo-controlled study. Obesity, 21(5), 935–943. https://doi.org/10.1002/oby.20309 [accessed 13 August 2026]
  2. National Institute for Health and Care Excellence. (2023). Obesity: identification, assessment and management (CG189). NICE. https://www.nice.org.uk/guidance/cg189 [accessed 13 August 2026]
  3. Garvey, W. T., et al. (2012). Two-year sustained weight loss and metabolic benefits with controlled-release phentermine/topiramate in obese and overweight adults (SEQUEL): A randomized, placebo-controlled, phase 3 extension study. American Journal of Clinical Nutrition, 95(2), 297–308. https://doi.org/10.3945/ajcn.111.024927 [accessed 13 August 2026]
  4. Torgerson, J. S., et al. (2004). XENical in the prevention of diabetes in obese subjects (XENDOS) study: A randomized study of orlistat as an adjunct to lifestyle changes for the prevention of type 2 diabetes in obese patients. Diabetes Care, 27(1), 155–161. https://doi.org/10.2337/diacare.27.1.155 [accessed 13 August 2026]
  5. Jastreboff, A. M., 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]
  6. Wilding, J. P. H., et al. (2021). Once-weekly semaglutide in adults with overweight or obesity. New England Journal of Medicine, 384(11), 989–1002. https://doi.org/10.1056/NEJMoa2032183 [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.

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Faq

Can you take Mysimba and Orlistat together UK?
Yes, it is possible to take Mysimba and Orlistat together in the UK, as they work through different mechanisms and do not have direct drug interactions. However, combination therapy must be clinically approved by a UK prescriber who will assess your individual suitability and monitor for side effects.
Is combining Mysimba and Orlistat more effective than monotherapy?
Limited published evidence exists on combination therapy, though the complementary mechanisms suggest potential additive benefits. Clinical decisions are made individually based on response to monotherapy, and many prescribers prefer sequential rather than simultaneous initiation to monitor tolerability.
What are the side effects of taking Mysimba and Orlistat together?
Side effects include those from each medication: nausea, headache, constipation, and elevated blood pressure from Mysimba, plus oily stools, faecal urgency, and flatulence from Orlistat. The combined side effect burden may be significant, requiring close monitoring by your prescriber.
How much does it cost to take Mysimba and Orlistat together at Cured Pharmacy?
Orlistat starts from £135.00 and Mysimba from £135.00 at Cured Pharmacy. If your prescriber approves combination therapy, you would purchase both medications, with total costs depending on your prescribed doses and treatment duration.
Do I need a prescription to buy Mysimba and Orlistat together?
Yes, both Mysimba and Orlistat are prescription-only medications in the UK. You must complete a clinical assessment with a UK-registered prescriber who will evaluate whether combination therapy is safe and appropriate for you.
Can you take Mysimba and Orlistat together if you have high blood pressure?
Mysimba can increase blood pressure and is contraindicated in uncontrolled hypertension. Patients with well-controlled blood pressure may be considered for treatment but require regular monitoring, particularly when combining medications.
Are GLP-1 injections better than combining Mysimba and Orlistat?
Clinical trials show GLP-1 medications like Mounjaro and Wegovy produce greater average weight loss (14.9-22.5%) compared to Mysimba or Orlistat monotherapy (typically 5-10%). Your prescriber will discuss which approach best suits your medical history, preferences, and budget.
How long can you safely take Mysimba and Orlistat together?
Treatment duration depends on individual response and tolerability. Clinical guidelines recommend reviewing weight loss medication after 12-16 weeks and discontinuing if inadequate response is achieved. Long-term Orlistat use requires monitoring for fat-soluble vitamin deficiency.
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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