Mounjaro weight loss injections UK — The Weight Clinic Skip to content
The Weight Clinic
Prescription-only medicine · available only after a clinical consultation with our prescriber
HomeTreatmentsMounjaro
Weight-loss medication

Mounjaro — our most effective treatment, fully supervised.

Medically reviewed by Ali Al Sibahi, Pharmacist Independent Prescriber (GPhC 2225108)

Mounjaro (tirzepatide) is a once-weekly injection licensed in the UK for weight management. We prescribe it only after a full clinical review — including a video consultation with our specialist weight-loss prescriber — and dispense from our own in-house pharmacy.

Active ingredientTirzepatide
AdministrationOnce-weekly injection
Dose range2.5mg – 15mg
From£160 / month
Check if you're eligible
✓ Free consultation✓ UK-registered clinician✓ No commitment
Mounjaro KwikPen (tirzepatide)
Specialist video consult
A clinician reviews and approves you before anything is dispensed
Access to clinicians on demand
Message a clinician any time, or jump on a video call — real support whenever you need it
How it works

The first dual-action weight-loss injection.

Tirzepatide is the active ingredient in Mounjaro. Unlike single-target GLP-1 medications, tirzepatide activates two gut-hormone receptors — GLP-1 and GIP — simultaneously. Both play a role in how your body regulates appetite, food intake and blood sugar after eating.

The combined effect is a noticeable reduction in appetite, slower stomach emptying (so you feel fuller for longer after meals), and improved blood-sugar control. It doesn't directly burn fat — it supports the conditions under which your body uses stored energy more effectively, alongside diet and lifestyle.

Mounjaro is licensed by the MHRA for weight management in adults with obesity, or overweight plus a related health condition. It is a prescription-only medicine and must be prescribed by a UK-registered clinician after proper assessment.

Side effects

What you might experience.

Most people get some side effects, especially when starting or increasing dose; they usually settle over a few weeks. This isn't exhaustive — see the full SmPC on eMC.

Common

Affects > 1 in 10
  • Nausea
  • Diarrhoea
  • Constipation
  • Vomiting
  • Decreased appetite
  • Fatigue

Uncommon

1 in 100 to 1 in 10
  • Dizziness
  • Abdominal pain or discomfort
  • Injection-site reactions
  • Hair loss
  • Gallstones
  • Hypoglycaemia (with type 2 diabetes)

Serious but rare

Seek medical attention
  • Severe allergic reaction
  • Acute pancreatitis
  • Severe hypoglycaemia
  • Severe gastrointestinal disease
  • Worsening diabetic retinopathy
!

Report any side effect. Tell your clinician and report it via the MHRA Yellow Card scheme — this helps the MHRA monitor the safety of all medicines.

Eligibility

Who can — and can't — take this.

Mounjaro is a powerful licensed medicine, and like any powerful medicine it isn't right for everyone. Your clinician assesses your full history during consultation.

Mounjaro may be suitable if you…

  • Are aged 18 or over
  • Have a BMI of 30+ (obesity)
  • Have a BMI of 27–30 with a weight-related condition (e.g. type 2 diabetes, high blood pressure, sleep apnoea)
  • Can safely self-inject weekly
  • Are ready to support treatment with diet and activity changes

Mounjaro is not suitable if you…

  • Are pregnant, planning pregnancy, or breastfeeding
  • Have type 1 diabetes
  • Have a personal/family history of medullary thyroid carcinoma or MEN2
  • Have a history of pancreatitis
  • Have severe gastrointestinal disease (e.g. gastroparesis)
  • Have an active eating disorder
  • Have severe liver or kidney impairment (case-by-case)
  • Are allergic to tirzepatide or any excipient

These lists aren't exhaustive — your clinician reviews your full medical history and current medicines before prescribing.

Transparent pricing

One monthly price. Clearly priced.

Your monthly price covers the medication, pen and needles. A sharps bin, wipes and other items can be added at checkout — no subscription lock-ins and no hidden fees, so you start low and escalate under supervision.

DoseStagePrice / mo*
2.5mgStarter · first 4 weeks£160
5mgStandard maintenance£185
7.5mgEscalation£240
10mgEscalation£260
12.5mgHigher maintenance£275
15mgMaximum licensed dose£295

* Standard monthly prices shown. You always see the exact price for your dose, including tracked delivery, before you pay.

Good to know

Mounjaro questions.

The things patients most often ask before starting. Still unsure? Our pharmacy team is happy to help.

Check your eligibility
How does Mounjaro work?
Tirzepatide, the active ingredient in Mounjaro, activates two gut-hormone receptors — GLP-1 and GIP. It reduces appetite, slows how quickly your stomach empties so you feel fuller for longer, and helps quieten the food noise that drives snacking, so you naturally eat less. It works alongside diet and activity changes, not instead of them.
How much weight can you lose on Mounjaro?
In the SURMOUNT-1 clinical trial, adults on the highest (15mg) dose lost on average 22.5% of their body weight over 72 weeks, alongside lifestyle support. Individual results vary and not everyone reaches this.
What are the most common Mounjaro side effects?
Most side effects are digestive — nausea, diarrhoea and constipation — and are most noticeable when you first start or move up a dose. They are usually mild and settle as your body adjusts, which is why the dose is increased slowly. Rarely, more serious problems such as pancreatitis can occur, so your prescriber explains which warning signs to watch for.
How do you take Mounjaro?
It is a once-a-week injection given just under the skin of your tummy, thigh or upper arm using a pre-filled pen, rotating the site each week. Most people find it quick and nearly painless. You can add a sharps bin and alcohol swabs to your order.
Who can be prescribed Mounjaro?
Generally adults with a BMI of 30 or above, or 27 or above with a weight-related condition such as type 2 diabetes or high blood pressure (lower thresholds may apply for some ethnic backgrounds). It is not suitable for everyone — a pharmacist prescriber reviews your full medical history and decides whether it is appropriate for you.
Can I switch to Mounjaro from another weight-loss treatment?
If you are already taking another weight-loss medicine, share evidence of your current medicine and dose during your consultation. Where clinically appropriate, your pharmacist prescriber can review whether you can continue at an equivalent dose rather than restarting at the lowest strength.
Compare treatments

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Explore the alternatives, or start the free check and your prescriber recommends the best fit for you.

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Free consultation, reviewed by a UK-registered clinician. Refund in full if we decline. No card required to start.

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