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
ADHD and Mounjaro — UK Cost and Access Guide
Mounjaro (tirzepatide) is a prescription-only weight management injection licensed in the UK for adults with a BMI of 30 or above, or 27+ with weight-related health conditions. Some people with ADHD may be interested in Mounjaro because stimulant medications can affect appetite and weight. This guide explains how to access Mounjaro in the UK, what it costs privately, and your NHS options. Check your BMI using our free BMI calculator above to see if you might be eligible.
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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.
Private Access and Cost in the UK
In the UK, Mounjaro is available through private prescription following an online clinical assessment with a UK-licensed prescriber. Private costs typically range from £129 to £320 per month depending on your dose, as the KwikPen device contains four weekly injections. Starting doses (2.5 mg) are usually lower cost, while maximum doses (15 mg) cost more. Prices vary between providers but most offer transparent, upfront pricing. The prescription is then dispensed by a GPhC-registered pharmacy. No NHS prescription is required for private access, meaning you don't need GP referral to a specialist weight management service. The clinical assessment usually involves a consultation questionnaire covering your medical history, current medications, and weight management goals. Results from dose titration (gradual dose increases) and side effect tolerance vary between individuals, so costs may change as you progress through treatment doses.
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 Access vs Private Route
NHS route: Mounjaro is approved by NICE for NHS specialist tier 3 weight management services in England. Access requires GP referral and assessment by a specialist multidisciplinary team. NHS availability varies significantly by region and waiting lists can be lengthy—sometimes months or years. Private route: Faster access without waiting lists. Available through online consultations with a licensed prescriber. No GP involvement required. Costs are your responsibility (not covered by NHS). Choose the private route if you want immediate access; choose NHS if eligible and you prefer no upfront cost, though waiting times apply. Use our GLP-1 weight loss calculator to estimate potential outcomes at different doses to help inform your decision.
- 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.
Can I get Mounjaro on the NHS if I have ADHD?
ADHD alone doesn't affect Mounjaro eligibility. NHS access depends on BMI (30+, or 27+ with weight-related conditions like high blood pressure or diabetes) and referral to a specialist weight management service. Having ADHD doesn't change these criteria, though your prescriber should know about any medications you take, including ADHD stimulants.
How much does Mounjaro cost privately per month?
Private costs typically range from £129 to £320 monthly depending on your dose. Starting doses (2.5 mg) are cheaper; maximum doses (15 mg) are more expensive. Each KwikPen contains four weekly injections. Prices vary between providers, so it's worth comparing.
How long does a private online consultation take?
Most online consultations take 15–30 minutes. You'll answer a detailed health questionnaire, discuss your weight and health goals, and the prescriber will assess whether Mounjaro is suitable. If approved, your prescription is sent to a pharmacy for dispensing, usually within 24–48 hours.
Can I switch between NHS and private Mounjaro?
Yes, you can move between NHS and private routes, though you should inform any healthcare provider you're seeing. There's no penalty for switching. Your prescriber on either route will manage your dose and monitor your progress.
Does ADHD medication affect how Mounjaro works?
Stimulant ADHD medications may affect appetite independently of Mounjaro. Tell your prescriber about all medications you take, including ADHD drugs, so they can monitor you properly. Individual responses vary, and your prescriber will adjust Mounjaro dosing if needed based on how you respond.
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.