The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
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Mounjaro Syringes and the Golden Dose — UK Access Guide
The term "golden dose" refers to the optimal Mounjaro dose that many people find most effective for weight loss with manageable side effects — typically between 10mg and 15mg per week. Mounjaro comes in pre-filled KwikPen syringes delivered once weekly. If you're considering Mounjaro in the UK, you'll want to understand both how the medication is delivered and what accessing it actually costs, whether through private prescription or NHS specialist services. This guide covers the practical essentials.
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Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
UK Private Prescription Costs for Mounjaro
In the UK, Mounjaro (tirzepatide) is prescription-only and must be obtained through either NHS specialist weight management services or private prescribing routes. Private prescription costs vary by dose and provider, typically ranging from £129 to £320 per month depending on whether you're at the starting dose (2.5mg) or maintenance doses like the golden dose range (10–15mg).
Each KwikPen syringe contains 4 weeks of injections. Syringes are pre-filled and single-use — you cannot buy empty syringes separately or refill them. The medication comes ready to inject with clear dosing instructions.
- Starting dose (2.5mg): typically £129–£150/month
- Mid-range doses (5–7.5mg): typically £160–£200/month
- Golden dose range (10–15mg): typically £220–£320/month
Costs reflect the specific dose, not the volume of the syringe. Private prescribers charge for clinical assessment and ongoing support, which is factored into these prices. NHS prescribing has no direct cost to the patient, but availability is limited and often involves waiting lists.
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How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
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NHS vs Private Access and What to Expect
If you qualify for NHS weight management services, Mounjaro may be available through your local integrated care board (ICB) at no direct cost — but access varies significantly by region and typically involves referral from your GP and assessment by a specialist tier 3 or 4 weight management service. Waiting lists in many areas extend several months or longer.
Private access is quicker: you complete an online consultation with a UK-licensed prescriber, they assess your eligibility based on BMI and health conditions, and if approved, your prescription is dispensed by a GPhC-registered pharmacy. The whole process typically takes 1–2 weeks. Use our GLP-1 weight loss calculator to explore potential weight loss at different Mounjaro doses, and our BMI calculator to check where you currently stand for eligibility assessment.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
What exactly is the Mounjaro "golden dose"?
The "golden dose" is informal terminology for the effective maintenance range of 10–15mg weekly, where many people achieve meaningful weight loss with tolerable side effects. However, the optimal dose varies by individual — some respond well at 5–7.5mg, others need the full 15mg. Your prescriber will determine your right dose based on your response and tolerance.
Can I buy Mounjaro syringes without a prescription in the UK?
No. Mounjaro is prescription-only in the UK and is a controlled medication. You must obtain a valid prescription from a UK-licensed prescriber (GP, private doctor, or NHS specialist) before any pharmacy can dispense it to you.
How much does Mounjaro cost on the NHS?
Mounjaro is free on the NHS if prescribed through specialist weight management services, as there is no patient charge. However, availability is limited by regional funding and waiting lists can be substantial. Ask your GP about NHS tier 3 weight management services in your area.
What's the difference between Mounjaro syringes and Wegovy syringes?
Both come as pre-filled single-use pens, but they contain different medications. Mounjaro contains tirzepatide (dual GIP/GLP-1 agonist), while Wegovy contains semaglutide (GLP-1 agonist only). Mounjaro is dosed weekly at higher strengths (up to 15mg); Wegovy is also weekly but with different starting and maximum doses. Choose based on prescriber recommendation and individual suitability.
Will private prescribers help me reach the golden dose?
Yes. Private prescribers follow a structured dose escalation plan — starting at 2.5mg and increasing every 4 weeks if tolerated, aiming to find your optimal dose. Most people following this schedule reach 10–15mg within 4–5 months. Your prescriber monitors your progress and adjusts based on your response and side effects.
Ready to take control of your weight loss journey?
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