Mounjaro (Tirzepatide) Weight Loss Injection

Buy Mounjaro UK at the Cheapest Price in the UK

Mounjaro is an MHRA licensed weight management treatment for adults in the UK, and it has changed what's possible in obesity care. It's the first medication of its kind to work on two appetite hormones at once, which is part of the reason patients on the highest dose lost an average of 22.5% of their body weight over 72 weeks in clinical trials. You take it as a single injection once a week.

Is Mounjaro right for you?
Mounjaro is licensed for adults with a BMI of 30 or above, or 27 and above if you also have a weight related condition such as type 2 diabetes, high blood pressure, or raised cholesterol. To get the best from it, you'll need to combine treatment with a reduced calorie diet and more physical activity. Our clinicians will check your eligibility as part of your consultation.

What the clinical evidence shows
Mounjaro has been studied extensively through the SURMOUNT trial programme. Patients on the 15mg maintenance dose lost an average of 22.5% of their body weight over 72 weeks. More than nine in ten participants lost at least 5% of their starting weight, and over half lost 20% or more. Many also saw improvements in blood pressure and cholesterol along the way.

Your treatment with Rightangled
We're a regulated UK pharmacy and prescribing service, which means every Mounjaro prescription is reviewed by one of our GMC registered clinicians, not algorithms. Most assessments are reviewed the same day. Your medication is dispensed from our GPhC registered pharmacy and arrives in discreet, temperature controlled packaging, and our clinical team is available throughout your treatment if you have questions or concerns.

What's in the box
Each Mounjaro KwikPen holds four weekly doses, so one pen is one month of treatment. We include the injection needles, the official patient information leaflet, and access to our clinical support team should you need it.

Your dosing schedule
Treatment starts low and increases gradually so your body has time to adjust. You'll begin on 2.5mg once a week for the first four weeks, then move up to 5mg, 7.5mg, 10mg, 12.5mg, and finally 15mg as your maintenance dose. Each step lasts around four weeks, though your clinician may slow this down if you're experiencing side effects, or keep you on a lower dose if it's working well for you.

What to expect from side effects
The most common side effects are digestive: nausea, mild diarrhoea, constipation, and occasional vomiting. They're usually mild, tend to settle within a few weeks, and are most noticeable just after a dose increase. Eating smaller meals more often and avoiding rich, fatty foods makes a real difference for most people.

When Mounjaro isn't suitable
Mounjaro isn't right for everyone. You shouldn't take it if you or a close family member has a history of medullary thyroid carcinoma or Multiple Endocrine Neoplasia syndrome type 2, or if you've had a serious allergic reaction to tirzepatide. It also isn't safe during pregnancy or breastfeeding, and you should stop treatment at least two months before trying to conceive.

Getting started
Start with our short online consultation. It takes around five minutes and asks about your health, medical history, and weight loss goals. One of our clinicians will review your answers, usually within hours, and if Mounjaro is suitable for you we'll dispense your prescription and send it out from our UK pharmacy with next day delivery available.

Mounjaro or Wegovy?
Both are excellent once weekly injections, but they work slightly differently. Mounjaro acts on two hormones (GLP‑1 and GIP) and showed an average 22.5% weight loss in trials. Wegovy works on GLP‑1 alone, with an average 15% weight loss. Mounjaro starts from £164.99 a month and Wegovy from £99.99. Your clinician will help you decide which is the better fit based on your goals, medical history, and budget.

 1. How much does Mounjaro cost in the UK? 

Mounjaro at Rightangled starts from £164.99 for the 2.5mg starting pen, with each pen containing four weekly doses (one month of treatment). The price rises with each dose step, up to £309.99 for the 15mg maintenance pen. There's no subscription and no consultation fee you pay per pen, and your prescription is only issued after a UK clinician confirms Mounjaro is suitable for you.

2. How much is each Mounjaro dose, from 2.5mg to 15mg? 

Each strength is a one-month pen: 2.5mg is £164.99, 5mg is £179.99, 7.5mg is £239.99, 10mg is £279.99, 12.5mg is £289.99, and 15mg is £309.99. You'll usually move up one dose roughly every four weeks, so your monthly cost increases as your dose does — unless your clinician keeps you on a lower dose that's working well.

3. Why does the Mounjaro price go up as my dose increases? 

Higher-strength pens contain more tirzepatide, so they cost more to produce and prescribe. Because Mounjaro treatment is designed to step up gradually 2.5mg, then 5mg, 7.5mg and beyond  your monthly price rises in line with your dose. Once you reach the dose that manages your appetite well, your price stays the same for as long as you stay on it.

4. How does Mounjaro work?

The active ingredient, tirzepatide, mimics two natural gut hormones called GLP‑1 and GIP. Together they reduce your appetite, slow how quickly your stomach empties, and help you feel satisfied for longer after eating. The result is fewer cravings and a more manageable relationship with food, which makes lifestyle changes far easier to stick to

5. Is Rightangled the cheapest place to buy Mounjaro in the UK? 

Rightangled's Mounjaro prices are among the most competitive in the UK, and every pen is genuine Eli Lilly Mounjaro dispensed from our GPhC-registered pharmacy, so a low price never means a compromise on safety. When you compare providers, check that the price includes the pen, needles, clinician review and delivery, as some services add these separately. With Rightangled, clinical review and next-day delivery are included.

6. How do I buy Mounjaro online in the UK? 

Start the short online consultation on this page, it takes two to three minutes and asks about your health, weight and medical history. A GMC-registered clinician reviews your answers (usually the same day) and, if Mounjaro is right for you, issues a prescription. Your pen is then dispensed from our UK pharmacy and delivered to your door. ID verification is required before your first order.

7. Can I buy tirzepatide without a prescription? 

No. Tirzepatide, the active ingredient in Mounjaro, is a prescription-only medicine in the UK and can't legally be sold without one. Rightangled provides a private prescribing service: complete the online assessment, and if you're eligible, one of our clinicians issues a private prescription and our pharmacy dispenses it. Anywhere selling tirzepatide without a consultation should be avoided.

8. How fast is Mounjaro delivery?

Once your prescription is approved, orders are dispatched the same day where possible, with next-day delivery available. Your Mounjaro arrives in discreet, temperature-controlled packaging with ice packs to keep the pen cool in transit, so it's ready to store in your fridge as soon as it arrives.

9. Is Rightangled a registered online pharmacy for Mounjaro? 

Yes. Rightangled is a regulated UK prescribing service working in partnership with Medetone, a pharmacy registered with the General Pharmaceutical Council (GPhC) and the Care Quality Commission (CQC). That means you don't need to find a Mounjaro clinic near you, the whole process, from consultation to delivery, is handled online by UK-registered clinicians and pharmacists.

10. What is Mounjaro and how does the injection work? 

Mounjaro is a once-weekly weight loss injection whose active ingredient, tirzepatide, is the first of its kind to act on two gut hormone receptors at once GLP-1 and GIP. Together they reduce appetite, slow how quickly your stomach empties, and help you feel full for longer, which quietens "food noise" and makes eating less feel more manageable. It's given as a small injection just under the skin, once a week.

11. What Mounjaro doses are available and how does the schedule work? 

Mounjaro comes in six strengths 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg and 15mg — each supplied as a KwikPen holding four weekly doses. You start on 2.5mg for four weeks to let your body adjust, then step up roughly every four weeks toward the dose that best controls your appetite. Your clinician may slow the increases if you get side effects, or keep you on a lower dose if it's already working.

12. Where is the best place to inject Mounjaro? 

Mounjaro is injected into the fatty layer just under the skin in one of three places: your stomach (keeping a few centimetres clear of the navel), the front of your thigh, or the back of your upper arm if someone else is injecting for you. Rotate the site each week so the skin doesn't get sore, and avoid any area that's bruised, red or hardened. No single site works "better" for weight loss consistency and rotation matter more.

13. What is the best time of day to take Mounjaro? 

You can take Mounjaro at any time of day, with or without food, there's no clinically "best" time. What matters is taking it on the same day each week. Many people pick a day and time that's easy to remember and fits their routine. If you need to, you can move your weekly dose to a different day as long as your last dose was at least three days earlier.

14. What should I do if I miss a dose of Mounjaro? 

If you miss a dose and remember within four days, take it as soon as you can, then continue on your normal weekly day. If more than four days have passed, skip the missed dose entirely and take your next one on the regular day, don't double up to make up for it. If you're ever unsure, our clinical team can advise.

15. How should I store my Mounjaro pen? 

Keep unopened pens in the fridge at 2-8°C and never freeze them. Once you start using a pen you can either keep it refrigerated or store it at room temperature (up to 30°C) for up to 30 days. Always replace the cap between uses to protect the medicine from light, and discard a pen 30 days after first use.

16. How much weight can I lose on Mounjaro? 

Adults with obesity on the 15mg maintenance dose lost an average of 22.5% of their body weight over 72 weeks. More than nine in ten participants lost at least 5% of their starting weight, and over half lost 20% or more. Individual results vary and depend on your dose, starting weight and how well you combine treatment with a reduced-calorie diet and more activity.

17. How long does Mounjaro take to work?

Most people notice a change in appetite and cravings within the first two to four weeks, even on the low 2.5mg starting dose. Visible weight loss is gradual and builds as your dose increases in trials, maximum average weight loss was reached around week 72. Steady, sustained loss is the goal rather than rapid drops.

18. What are real Mounjaro reviews like? 

Mounjaro consistently earns strong reviews from UK patients, who most often describe reduced appetite, quieter "food noise" and steady weight loss over several months. You can read verified customer feedback for Rightangled on our Trustpilot page. As with any medicine, experiences vary, and your clinician will help set realistic expectations for your own treatment.

19. Do I need to follow a diet while taking Mounjaro?

Yes, Mounjaro is licensed to be used alongside a reduced-calorie diet and increased physical activity, not instead of them. The medication makes those changes far easier to stick to by curbing appetite, but the lifestyle side is what turns that into lasting results. You don't need a specific "Mounjaro diet"; balanced meals, adequate protein and smaller portions work well for most people.

20. What are the side effects of Mounjaro? 

The most common Mounjaro side effects are digestive: nausea, mild diarrhoea, constipation and occasional vomiting. They're usually mild, tend to settle within a few weeks, and are most noticeable just after a dose increase. Eating smaller meals and avoiding rich, fatty foods helps. Seek medical advice if side effects are severe or persistent the patient information leaflet lists all possible effects.

21. What BMI do I need to be prescribed Mounjaro? 

Mounjaro is licensed for adults with a BMI of 30 or above, or a BMI of 27 or above if you also have a weight-related condition such as type 2 diabetes, high blood pressure or raised cholesterol. Our clinicians confirm your eligibility, including your BMI, as part of the online consultation before any prescription is issued.

22. Is Mounjaro safe?

Mounjaro (tirzepatide) has a well-established safety profile, supported by the large SURMOUNT clinical trial programme and approval from regulators including the UK's MHRA for weight management. Like all medicines it has possible side effects, mostly mild and digestive, and it isn't suitable for everyone. That's why every Rightangled prescription is reviewed by a GMC-registered clinician rather than issued automatically.

23. Does Mounjaro affect the contraceptive pill or fertility? 

Mounjaro can reduce how well the oral contraceptive pill is absorbed, which may lower its effectiveness. If you use the pill and could become pregnant, you should add a barrier method such as condoms, or switch to a non-oral method like an IUD or implant, while taking Mounjaro. Speak to your clinician about the right option for you.

24. Can I use Mounjaro during pregnancy or breastfeeding? 

No. Mounjaro should not be used during pregnancy or while breastfeeding, as its safety in these situations hasn't been established. If you're planning to conceive, you should stop Mounjaro at least one to two months beforehand. Let your clinician know if you're pregnant, breastfeeding or trying for a baby so they can advise on alternatives.

25. Mounjaro vs Wegovy, which is better for weight loss? 

Both are once-weekly injections, but they work slightly differently. Mounjaro (tirzepatide) acts on two hormones, GLP-1 and GIP, and delivered an average 22.5% weight loss in trials; Wegovy (semaglutide) acts on GLP-1 alone, with around 15% average loss, and starts at a lower price. Neither is universally "better" the right choice depends on your goals, medical history and budget. See our full Mounjaro vs Wegovy comparison, and your clinician will help you decide.

26. Can I switch to Mounjaro from Wegovy or another provider? 

Yes, many people switch to Mounjaro from Wegovy or another weight loss treatment. During your online consultation, tell us what you're currently taking and your latest dose so your clinician can recommend a safe starting point on Mounjaro. You don't need to finish your current supply first; your clinician will guide the transition.

Mounjaro is a prescription only medicine regulated by the MHRA and must be prescribed after a proper medical assessment. For full prescribing information, please refer to the Summary of Product Characteristics on medicines.org.uk.

This service is provided by Rightangled in partnership with Medetone pharmacy, regulated by the General Pharmaceutical Council and the Care Quality Commission. Mounjaro® is a registered trademark of Eli Lilly and Company.

References

• Jastreboff AM, et al. Tirzepatide Once Weekly for the Treatment of Obesity (SURMOUNT-1). New England Journal of Medicine 2022;387(3):205–216. https://www.nejm.org/doi/10.1056/NEJMoa2206038
• Mounjaro KwikPen — Summary of Product Characteristics (SmPC), Eli Lilly and Company. electronic Medicines Compendium. https://www.medicines.org.uk/emc/product/15484/smpc