This guide sets out the licensed weight-management alternatives to Mounjaro, Wegovy, Saxenda and orlistat, how they differ, and how a prescriber chooses between them. It draws on the UK Summaries of Product Characteristics, NICE and the NHS. It does not rank them, because the right option depends on you.
Why you might need an alternative to Mounjaro
There are a few common reasons people look for an alternative. The first is tolerance: if the gastrointestinal side effects are too difficult, even after the gradual titration, a different medicine may suit better 1. The second is suitability: Mounjaro is not appropriate for everyone, for example in pregnancy or with certain histories, so an alternative may be needed 1.
The third is response: if the medicine is not delivering enough benefit at the highest tolerated dose, a prescriber may consider whether something else fits better 1. Our guide on recognising when GLP-1 treatment is not right for you explores this from the patient's side.
Whatever the reason, the key point is that switching is a clinical decision made with a prescriber, who can match an alternative to your history and to why Mounjaro did not work 9. The sections below describe the licensed options so you can have an informed conversation.
It is also worth checking, before switching, whether the problem can be addressed without changing medicine at all. If the issue is gut side effects, slowing the pace of dose increases or staying longer at a tolerated dose sometimes helps, since these effects tend to ease over time 1. If the issue is that Mounjaro is not working, it is worth confirming you have reached an adequate, tolerated dose first 1. A prescriber can weigh whether an adjustment or a switch is the better move 9.
Wegovy (semaglutide)
Wegovy is a brand of semaglutide, a GLP-1 receptor agonist given as a once-weekly injection 2. It is the semaglutide product licensed for weight management, distinct from Ozempic and Rybelsus, which are licensed for type 2 diabetes 2. Like Mounjaro it reduces appetite, though it acts on one receptor (GLP-1) rather than two 2.
The maintenance dose is 2.4 mg once weekly, reached by a 16-week escalation from a low starting dose 2. On the NHS, NICE recommends semaglutide for weight management only within a specialist service and for a maximum of two years, for adults with a BMI of at least 35, or 30 to 34.9 with referral criteria, plus a weight-related condition 3.
For many people moving from Mounjaro, Wegovy is the most directly comparable alternative, another weekly GLP-1 injection 2. Our guides on Mounjaro versus Wegovy and how Wegovy works cover it in more detail.
One thing worth knowing if you are switching because of side effects: because Wegovy is also a GLP-1 medicine, its common side effects are similar gut ones, mainly nausea, and it carries the same broad cautions about pancreatitis and gallbladder problems 2. So switching from Mounjaro to Wegovy may not eliminate gut side effects, though individuals tolerate the two differently, which is part of why the choice is made with a prescriber rather than assumed 21.
Saxenda (liraglutide)
Saxenda is the brand name for liraglutide, another GLP-1 receptor agonist 4. The clearest practical difference is the schedule: Saxenda is a daily injection, not weekly 4. It is started at 0.6 mg once daily and increased weekly to a maintenance dose of 3.0 mg daily 4.
It is licensed for adults with a BMI of 30 or above, or 27 to under 30 with a weight-related condition, and the SmPC advises stopping if at least 5 percent of body weight has not been lost after 12 weeks on the 3.0 mg dose 4. On the NHS, NICE recommends liraglutide only for a narrow group: a BMI of at least 35 with non-diabetic hyperglycaemia and high cardiovascular risk, in a specialist tier 3 service 5.
Liraglutide is generally used less often than the newer weekly options now, and NICE found more weight is lost with semaglutide than with liraglutide, but it remains a licensed, evidence-based choice, and the daily schedule suits some people 34. Our guide on the Saxenda weight loss injection covers it further.
Considering treatment for weight management? You can start an assessment with a Cloud Pharmacy clinician, who will review your medical history and confirm whether treatment is appropriate.
Orlistat (a tablet option)
If the issue is injections, orlistat is a licensed weight-loss tablet that works in a completely different way 6. It is a lipase inhibitor: it blocks the absorption of some dietary fat, so about a third of the fat in your food passes through undigested, rather than acting on appetite hormones 6.
It is sold as Xenical on prescription and at a lower dose as Alli or Orlos from a pharmacy 6. Its benefit is modest: in trials, around 37 percent of people on orlistat lost at least 5 percent of their body weight by 12 weeks, against 19 percent on placebo, with an average difference from placebo of about 3.2 kg at one year 7. Both the SmPC and NHS advise stopping if you have not lost at least 5 percent of your weight after 12 weeks 76.
Orlistat's side effects are gastrointestinal and follow from how it works, mainly oily or fatty stools, especially with high-fat meals 6. It is a very different option from the GLP-1 medicines, and it suits people who prefer a tablet and a different mechanism, though the weight loss is generally smaller 7.
How a prescriber chooses an alternative
Choosing between these is a clinical decision, not a ranking 1. A prescriber weighs why Mounjaro did not suit you, your medical history and contraindications, what you can tolerate, your preference on format (injection or tablet, weekly or daily), and what you can access on the NHS or privately 19.
If the problem with Mounjaro was the gut side effects, another GLP-1 medicine may carry similar effects, so a prescriber will consider whether a different mechanism, such as orlistat, or a slower approach makes more sense 46. If the problem was suitability, such as pregnancy, the alternative has to fit that situation too 1.
NHS access also shapes the choice, because the three options have different NHS criteria: tirzepatide and semaglutide have their own thresholds, and liraglutide is restricted to a narrow high-risk group 35. Our overview of weight-loss treatments sets the options side by side.
It is also worth being realistic about what switching achieves. Moving between the GLP-1 injections changes the specific medicine and its dosing schedule, but not the broad class of side effects or the lifestyle work that has to run alongside 248. Moving to orlistat changes the mechanism entirely, but for a more modest average weight loss 7. A prescriber weighs those trade-offs against your reasons for leaving Mounjaro, which is why the decision is individual rather than a simple swap to the next medicine on a list 1.
Other options and what this guide does not cover
These three, Wegovy, Saxenda and orlistat, are the licensed weight-management alternatives this guide covers, because they sit within the sources it relies on 246. They are the main licensed options most people will be considering if Mounjaro does not suit them.
You may see other names mentioned, such as Mysimba, in discussions of weight-loss medicines. This guide does not detail those, because they are not covered by the sources used here; a prescriber can advise on whether any other licensed option is appropriate for you. The safe principle is to discuss alternatives with a clinician rather than self-select from a list online 9.
Whatever the alternative, the same safeguards apply: it should be a licensed UK medicine, supplied by a registered pharmacy after a clinical assessment, and used alongside diet and activity as NICE frames it 89. Switching medicine does not change those principles, and it is best done as a planned change with a prescriber rather than by sourcing a different medicine yourself from an unverified seller 9.
Frequently asked questions
What can I take instead of Mounjaro?
The licensed UK weight-management alternatives include Wegovy (semaglutide) and Saxenda (liraglutide), both GLP-1 injections, and orlistat, a tablet that works differently 246. They differ in mechanism, schedule and NHS access, and the right one is a clinical decision matched to your history and to why Mounjaro did not suit you 19.Is Wegovy or Saxenda a better alternative to Mounjaro?
Neither is automatically better; it depends on you. Wegovy is a weekly GLP-1 injection most directly comparable to Mounjaro, while Saxenda is a daily GLP-1 injection 24. NICE found more weight is lost with semaglutide than with liraglutide, but the choice also rests on tolerance, suitability and access 3. A prescriber decides with you 1.Is there a tablet alternative to Mounjaro?
Orlistat is a licensed weight-loss tablet, sold as Xenical on prescription or Alli/Orlos from a pharmacy 6. It works differently, by blocking fat absorption rather than acting on appetite, and its weight loss is more modest, around a 3.2 kg average difference from placebo at one year 67. There is no oral version of Mounjaro itself 1.Why might I need an alternative to Mounjaro?
Common reasons are not tolerating the side effects, the medicine not being suitable for you (for example in pregnancy), or it not delivering enough benefit at the highest tolerated dose 1. Switching is a clinical decision: a prescriber matches an alternative to your history and to why Mounjaro did not work 9.Can I just switch from Mounjaro to another medicine myself?
No. Switching should be a clinical decision made with a prescriber, who can choose an alternative appropriate to your history and arrange it safely 19. Any alternative should be a licensed UK medicine from a registered pharmacy after an assessment, used alongside diet and activity 89. Do not source a different medicine from an unverified seller 9.If Mounjaro gave me side effects, will an alternative be better?
It depends on the alternative. Wegovy and Saxenda are also GLP-1 medicines with similar gut side effects, so switching between them may not remove the effects, though people tolerate them differently 24. Orlistat works by a different mechanism but has its own gastrointestinal effects and a more modest benefit 67. A prescriber can advise which is most likely to suit you 1.Your next step
If Mounjaro does not suit you, there are licensed alternatives: Wegovy and Saxenda as GLP-1 injections, and orlistat as a tablet that works differently. They vary in mechanism, schedule and NHS access, and the right one depends on why Mounjaro did not work for you, your medical history and what you can tolerate and access.
Discuss the options with your GP or pharmacist, or start a consultation with a clinician who can match an alternative to your situation, rather than self-selecting from a list. Any alternative should come from a registered pharmacy after a clinical assessment, and be used alongside diet and activity. And remember that switching medicine changes the specific drug and its dosing, but not the need for the lifestyle changes that underpin any weight-management treatment, nor the safeguards of a registered pharmacy and a clinical assessment. The right alternative is the one matched to you and your history, not simply the next medicine on a list, which is why the choice belongs with a prescriber.
Disclaimer
This guide is for general information only and does not constitute medical advice, diagnosis or treatment. The information here describes general clinical context based on UK regulatory sources cited above; it is not a recommendation for any specific medicine or treatment, which can only be made by a prescriber following individual assessment.
If you are considering treatment, speak to your GP or pharmacist, or arrange a consultation with a Cloud Pharmacy clinician. Prescription-only medicines are issued only after clinical assessment and where appropriate.
If you experience side effects from any medicine, you can report them through the Yellow Card scheme at yellowcard.mhra.gov.uk.
