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
Free tracker included with every download this week
Mounjaro Neck Pain — What You Need to Know
Neck pain is not listed as a common side effect of Mounjaro (tirzepatide) in clinical trials, but some users report neck or shoulder discomfort during treatment. This guide explains what we know about this experience, how to access Mounjaro in the UK, and what costs to expect through NHS and private routes. If you experience persistent neck pain while taking Mounjaro, always discuss it with your GP or prescriber to rule out other causes.
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Calculate Your BMI Instantly
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.
How to Access Mounjaro in the UK and What It Costs
Mounjaro is available in the UK through two main routes: NHS specialist weight management services and private online prescription providers. NHS access typically involves referral to a tier 3 or tier 4 weight management service; eligibility requires a BMI of 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes or cardiovascular disease. Waiting times for NHS services vary significantly by region and can extend to several months. Private access is available through GPhC-registered online prescribers following an online clinical assessment. Private costs typically range from £130–£320 per month depending on your dose and provider. Each Mounjaro KwikPen contains four weekly injections, so most users renew monthly. The starting dose is 2.5 mg, titrating up to a maximum of 15 mg over several weeks, which affects total costs.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
NHS vs Private: Which Route Is Right for You?
NHS route: Free at the point of use (no prescription charges in England), but access varies by region and can involve lengthy waiting lists. Your GP refers you to a specialist service where a multidisciplinary team assesses your eligibility and manages your treatment. Private route: Faster access without waiting lists—you can start treatment within days of a successful assessment. Available immediately without NHS referral. Private prescriptions are dispensed by regulated pharmacies with full clinical support, though costs are your responsibility. Consider your budget, how urgently you need to start, and regional NHS availability when choosing your route. Use our free GLP-1 weight loss calculator to explore projected outcomes at different doses before committing to treatment.
- 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.
Is neck pain a known side effect of Mounjaro?
Neck pain is not listed as a common or very common side effect in Mounjaro clinical trials. However, some individuals report neck or shoulder discomfort, which may relate to nausea, posture changes during side effects, or unrelated factors. If you experience persistent neck pain while taking Mounjaro, report it to your prescriber to ensure no other cause is present.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs typically range from £130–£320 per month depending on your dose. Starting doses (2.5–5 mg) are usually at the lower end; maintenance doses (10–15 mg) are at the higher end. Prices vary between providers, so it's worth comparing. Each KwikPen (four weekly injections) is usually dispensed monthly.
Can I get Mounjaro free on the NHS in the UK?
Yes, Mounjaro is available on the NHS through specialist tier 3/4 weight management services for eligible adults. You'll need a BMI of 30 or above, or 27–29.9 with weight-related health conditions. Access varies by region, and waiting lists can be lengthy. Ask your GP about local availability and referral.
What's the difference between Mounjaro and Wegovy for UK access?
Both are prescription-only GLP-1-type medications. Mounjaro (tirzepatide) is a dual GIP/GLP-1 agonist; Wegovy (semaglutide) is GLP-1 only. Both are available privately and through NHS specialist services with similar eligibility criteria. Clinical trials showed different average weight loss outcomes, so your prescriber will advise which suits you best.
How long does an online consultation for private Mounjaro take?
Online consultations typically take 15–30 minutes. You'll complete a health questionnaire, have a video or phone call with a UK-licensed prescriber, and receive a prescription if appropriate. If approved, your prescription is sent to a GPhC-registered pharmacy, and your first KwikPen usually arrives within 2–5 working days.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.