Best Weight Loss Injections: Which One May Suit You?
Mounjaro, Wegovy and Saxenda are some of the most effective weight loss injections currently available in the UK. However, no single weight management injection is automatically the best choice for everyone. Different prescribed injections work in different ways and vary in effectiveness, dosing, side effects and suitability.
There is no single injection that is inevitably the best one for every person. The right choice depends on your BMI, your health, your goals, any other medications you take and how well you tolerate the treatment.
This article guides you through the best weight loss injections available in the UK: the main treatment options and how they work, their effectiveness, safety, who can use them, costs and treatment in private clinics. By the end, you will understand the options and the factors that determine the best treatment for you.
Thinking about weight loss injections? My Private Clinic offers consultations through our Weight Loss Clinic Preston, where you can explore your options and which injection might suit your weight loss journey.
Main Types and Names of Weight Loss Injections in the UK
Some of the most common weight loss injections in the UK are Mounjaro, Wegovy and Saxenda. These are the most widely used options, but they differ in their active ingredients and how often they are given.
| Injection | Active ingredient | Type | Frequency |
|---|---|---|---|
| Mounjaro | Tirzepatide | GIP/GLP-1 | Weekly |
| Wegovy | Semaglutide | GLP-1 | Weekly |
| Saxenda | Liraglutide | GLP-1 | Daily |
What Should You Consider Before Choosing a Weight Loss Injection?
Choosing a prescription weight loss injection is not simply a matter of comparing results. A medical assessment establishes what is suitable for you and the best way forward for managing your weight.
According to NICE guidance on overweight and obesity management (NG246), the factors considered before prescribing a weight loss injection include:
- Body mass index and health: your BMI, any health problems and your general health.
- Medications used: other medicines you take and the risk of interactions.
- Previous attempts to lose weight: what you have tried and how well it worked.
- The goal of treatment: how much weight you want to lose and your longer-term goals.
- Eating behaviour: hunger, cravings, portion size and eating habits.
- Side effect tolerance: how well you tolerate side effects, and any added risk factors.
- Lifestyle: your diet, physical activity and how well the treatment fits your routine.
- Long-term treatment: whether you can continue treatment and stick to the recommended dose.
- Monitoring: follow-up appointments and tests to track your progress and any side effects.
Which Weight Loss Injection Could Help You Lose the Most Weight?
Clinical trials show that average weight reduction differs between Mounjaro, Wegovy and Saxenda. Average weight loss was 20.2% with tirzepatide (Mounjaro) compared with 13.7% with semaglutide (Wegovy) in the 72-week SURMOUNT-5 trial.
In the 68-week STEP 8 trial, average weight reduction was 15.8% with semaglutide and 6.4% with liraglutide (Saxenda).
From those results, Mounjaro and Wegovy are among the most effective injections for reducing weight. That does not necessarily mean the two will work the same way for everyone, and there are other things to take into account when choosing a weight loss injection.
Does the Fastest Weight Loss Injection Mean It’s the Best?
There is no universal answer to what is best.
A faster-acting weight loss injection is not automatically better than another. Mounjaro, Wegovy and Saxenda differ in how much weight loss they produce, even under trial conditions, and clinical trials show those differences clearly.
To help you make an informed decision, here is a fuller comparison of the main weight loss injections.
| Feature | Mounjaro | Wegovy | Saxenda |
|---|---|---|---|
| Active ingredient | Tirzepatide | Semaglutide | Liraglutide |
| Type | GIP/GLP-1 | GLP-1 | GLP-1 |
| How often | Once per week | Once per week | Once per day |
| Effect on appetite | Helps reduce appetite and food intake | Helps reduce appetite and food intake | Increases feelings of fullness while reducing appetite |
| Expected weight loss | Greater average weight loss in the relevant clinical trials | Significant average weight loss in the relevant clinical trials | Lower average weight loss in the relevant clinical trials |
| Important factors | Side effects and individual suitability | Side effects and individual suitability | Side effects, daily dosing and individual suitability |
So, Which Weight Loss Injection Could Suit Your Goals? The Final Verdict
As the comparison shows, the most suitable weight loss injection is the one that fits your goals once all the influencing factors are taken into account.
- Mounjaro: worth considering if a higher average weight loss is an important goal.
- Wegovy: produces substantial weight loss with once-weekly dosing.
- Saxenda: another GLP-1 option, given once a day.
So when someone asks which weight loss injections work best, or which GLP-1 works best for weight loss, the answer is the one that suits the individual.
How Do Weight Loss Injections Actually Help You Lose Weight?
These injections support weight loss by reducing appetite and food intake.
- GLP-1: GLP-1 agonists such as Wegovy and Saxenda reduce appetite and increase feelings of fullness.
- GIP/GLP-1: Mounjaro acts on both GIP and GLP-1 to control hunger and reduce food intake.
- Appetite suppression: these injections act on hunger and fullness signals, which reduces appetite.
- Food intake: a smaller appetite and greater fullness can lead to a lower calorie intake.
In short, weight loss injections change hunger and fullness signals, which leads to eating less. Learn more about how weight-loss drugs like Mounjaro and Wegovy work.
Are Weight Loss Injections Safe, and What Side Effects Can You Expect?
Mounjaro, Wegovy and Saxenda are prescribed after a clinical assessment. They are licensed for particular uses, and like all prescription medicines they can cause side effects and are not suitable for everyone.
- Common side effects include nausea, vomiting, diarrhoea, constipation and other digestive symptoms. These are mostly mild to moderate and usually improve over time.
- Rarer, serious side effects include acute pancreatitis, gallbladder problems and anaphylaxis. Persistent severe abdominal pain needs urgent medical attention.
- Who should not take these medicines: suitability differs by medicine and by patient. Medical conditions, pregnancy or breastfeeding, a history of pancreatitis, or certain other medicines may all be relevant.
- Why medical assessment matters: your clinician considers your medical history, current medications and overall suitability to weigh up the risks and find the most appropriate treatment.
- Treatment monitoring: follow-up appointments review how well treatment is working, how much weight you have lost, and any side effects.
Whether you are eligible for weight loss injections should be assessed by a healthcare professional, not decided on expected weight loss alone.
Could I Be Eligible for Weight Loss Injections? What Are the Criteria?
NICE-recommended eligibility criteria for weight loss injections depend on BMI, overall health and individual factors. In adults, you may be eligible for a medicine such as Mounjaro if your BMI is 30 or above, or 27 to under 30 with at least one weight-related health condition.
Important points to note:
- BMI forms the basis of eligibility.
- Conditions that affect eligibility include type 2 diabetes, high blood pressure, abnormal cholesterol and sleep apnoea.
- The licensed criteria for Mounjaro are a BMI of 30 or above, or 27 to under 30 with a weight-related condition.
- BMI is not the only factor.
- A healthcare professional or weight management specialist can determine whether you qualify for Mounjaro or another injection after a full clinical assessment.
What Will Weight Loss Injections Cost You Privately?
The total cost depends on the medicine, the dose and any additional tests your private clinic needs to arrange.
The cost depends on:
- Medication: costs vary by medicine (Mounjaro, Wegovy and so on) and are higher at higher doses.
- Consultation: you need a GP consultation for a prescription. The first weight loss consultation at My Private Clinic costs £99.
- Prescription: allow for prescription and dispensing fees.
- Follow-up: some plans include follow-up and dose adjustments; others charge separately.
- Other services: any additional support you may need.
At My Private Clinic in Fulwood, Preston, we set out costs transparently, so you know what to expect before booking an appointment. See our full pricing page for details.
Where Can You Get Mounjaro or Wegovy?
Mounjaro and Wegovy are prescription-only medicines, so they should be obtained from a suitable medical practitioner after an appropriate clinical assessment. If you are wondering where to get Mounjaro or Wegovy, a GP-led private clinic can assess your eligibility and prescribe based on clinical need.
From Consultation to Treatment: How Do You Get Weight Loss Injections in Preston?
If you are wondering how or where to get weight loss injections, the first step is a private GP consultation rather than simply choosing an injection.
Step 1: Consultation
Tell your GP about your weight, your weight loss goals and what you have already tried.
Step 2: Assessment of your medical and weight history
Your body mass index (BMI), medical conditions, medications and other health factors are assessed to establish whether you might benefit from prescription weight loss treatment.
Step 3: Discussion of the available options
Your doctor explains which prescription weight loss options, such as Mounjaro or Wegovy, are suitable in your case.
Step 4: Prescription, if suitable
Your doctor prescribes the appropriate medicine and dose if treatment is suitable for your situation.
Step 5: Treatment and follow-up
You start treatment with follow-up appointments to review your progress and adjust the dose where needed.
Why Consider My Private Clinic for Your Weight Loss Journey?
Choosing a private weight loss clinic is about more than getting a prescription. At My Private Clinic in Fulwood, Preston, treatment is based on medical consultation, tailored plans and GP-led care through our Weight Loss Clinic Preston.
- GP-led, tailored treatment: Dr Faizal Secretary discusses your health, history, goals and previous weight loss attempts before recommending any treatment.
- A plan made for you: injections are not automatic; alternatives such as Mounjaro or Wegovy are discussed.
- Continued treatment: follow-up appointments to review progress and side effects.
- Help beyond injections: tailored advice on lifestyle, nutrition and changes to your plan.
- A CQC-registered private clinic: My Private Clinic is registered with the CQC, provides referrals and offers consultations in Fulwood, Preston.
The point of the process is not just a prescription; it is medical assessment and continuing support.
What Is Included in Your Appointment?
Depending on your needs, your private consultation can include:
- A comprehensive medical assessment, including BMI and the other criteria for prescribing weight loss injections.
- A personalised treatment plan.
- A specialist referral letter, if required.
- Blood tests or scans arranged, if needed.
- A review of your NHS records, with your consent.
- A sick note or employer letter, if you need one.
- Follow-up on any outstanding results and ongoing support.
Tests and any further care are charged separately, and you will always be told the cost first, with everything explained before you decide.
Other options available at My Private Clinic include:
- Private GP appointments with ongoing support.
- Full Health MOT in Preston to identify any undiagnosed or untreated conditions, as a preventive assessment of your overall physical wellbeing.
- Private blood tests to evaluate any hidden metabolic changes that can cause excess fat, particularly visceral fat.
- Women’s hormone blood tests to evaluate PCOS, as hormone imbalances can cause central obesity.
- Private testosterone testing in Preston: tests, costs and an NHS guide.
- Men’s health GP Preston, including testosterone assessment, cardiovascular risk and prostate health.
- Medical weight management consultations with clinically supervised treatment options where appropriate.
- Private GP home visits in Preston for patients who are unable to attend the clinic.
- Sexual health and STI clinic Preston, including confidential STI and HIV testing.
Visit our full services page.
Frequently Asked Questions
Can weight loss injections be used with other weight loss methods?
They can be used alongside other approaches, such as a balanced diet and exercise. Combining weight loss injections with other weight loss medicines should only be done on your doctor’s recommendation.
How long is weight loss injection therapy needed?
The duration of treatment is different for each person, because weight management is a long-term process. Your doctor will review your progress from time to time and decide with you whether to continue treatment.
What happens when I stop using weight loss injections?
Once treatment stops, the effect on appetite control wears off and some people start to regain weight. Your doctor will talk you through stopping treatment and what to do next.
Will weight loss injections suppress appetite after I stop?
The appetite-suppressing effect does not last long after you stop using weight loss injections. Hunger and appetite gradually return.
Can I drink alcohol during treatment with weight loss injections?
Alcohol can worsen the digestive side effects these medicines can cause, and it can work against weight loss. Ask your doctor about alcohol in relation to your own situation.
Can I exercise during treatment with weight loss injections?
Yes. Exercise can be an important part of your weight loss plan alongside treatment.
What should I do if I miss a dose of a weight loss injection?
It depends on the medicine and how long ago the dose was due. Check the patient information leaflet or ask your doctor. Do not take a double dose.
Can weight loss injections be used after losing weight?
In some cases treatment continues as weight maintenance. That decision needs a discussion with your doctor.
Ready to Explore the Best Weight Loss Injections in Preston?
Mounjaro, Wegovy and Saxenda differ in how they work, how often they are taken and how people respond to them. The best weight loss injections on average are not necessarily the best fit for you, which is why personalised medical advice matters.
Dr Faizal Secretary, an experienced GMC-registered GP at My Private Clinic, offers private weight loss consultations. You’ll receive a thorough medical evaluation, individualised treatment recommendations and ongoing support to help you reach your weight loss goals in a safe, sustainable way.
Book a private GP consultation in Preston to discuss your weight loss goals and find out which type of injection suits your health needs.
Appointments are available:
- Face-to-face at our private GP clinic in Fulwood
- Online GP consultations in Preston
- Same-day appointments where available
- Private GP home visits where clinically appropriate in Fulwood and Preston
No registration is required. With your consent, we can also access your NHS records, and you remain registered with your NHS GP.