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
Is Mounjaro Used for ADHD in the UK?
Mounjaro (tirzepatide) is not approved or recommended for treating ADHD in the UK. Mounjaro is a prescription weight management injection licensed by the MHRA for adults with obesity or overweight with weight-related health conditions. If you have ADHD and weight concerns, it's important to understand what medications are available and how they work. Your GP can discuss both ADHD treatment options and separate weight management support tailored to your individual health needs.
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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.
What Mounjaro Is Actually Approved For
Mounjaro (tirzepatide) is licensed in the UK exclusively for weight management, not for ADHD or any psychiatric condition. It is a dual GIP and GLP-1 receptor agonist that works by reducing appetite and helping people feel fuller after meals. In clinical trials, Mounjaro helped participants lose an average of 15–21% of their body weight when used alongside dietary changes and increased physical activity.
UK eligibility criteria for Mounjaro include:
- BMI of 30 kg/m² or above, or BMI of 27–29.9 kg/m² with weight-related health conditions
- Adults aged 18 or over
- A clinical assessment confirming suitability
Mounjaro is available through NHS specialist tier 3 weight management services or via private prescription following an online clinical assessment. It is not prescribed for ADHD, anxiety, mood disorders, or any neuropsychiatric condition.
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.
ADHD Medications and Weight: A Complex Picture
Some ADHD medications (particularly stimulant medications like methylphenidate) can affect appetite and metabolism, sometimes supporting weight loss but occasionally contributing to weight gain in some individuals. If you have ADHD and are concerned about your weight, or if you're on ADHD medication and noticing weight changes, discuss this openly with your GP or specialist.
Your healthcare team can help you balance ADHD symptom management with weight health. This might involve reviewing your current medication, exploring lifestyle modifications, or in some cases, considering separate weight management support such as NHS tier 3 services. These services can assess whether prescription weight management options like Mounjaro are appropriate for you alongside your existing treatment plan.
If you're managing both ADHD and weight concerns, you're not alone—many UK adults face this combination of health needs. The key is integrated care: working with your GP and any specialists (ADHD clinicians, weight management services) to ensure all treatments work together safely. Use our free BMI calculator above to check your current BMI and understand your weight health context, then discuss the results with your GP as part of a broader conversation about managing both ADHD and weight together.
- 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 Mounjaro ever prescribed off-label for ADHD in the UK?
No. Mounjaro is not used off-label for ADHD in UK clinical practice. It is licensed exclusively for weight management and is not approved for psychiatric or neurological conditions. If you have ADHD, treatment options are managed separately by ADHD specialists using evidence-based ADHD medications.
Can ADHD medication cause weight gain, and does that affect Mounjaro eligibility?
Some ADHD medications can affect appetite and weight differently in different people. If ADHD medication contributes to weight gain and you meet BMI eligibility criteria, you may be considered for weight management support including Mounjaro—but this requires a separate assessment by a weight management service, not your ADHD clinician.
If I have ADHD and want to lose weight, can I get Mounjaro on the NHS?
Potentially, but you'd need to be referred to an NHS tier 3 specialist weight management service. Your GP can discuss whether this is appropriate for you. Availability varies by region (ICB), and waiting times can be lengthy. Your ADHD treatment would continue separately alongside any weight management plan.
Should I tell my GP about ADHD medication when asking about weight management?
Yes, absolutely. Always inform your GP or any prescriber about all medications you're taking, including ADHD medication. This helps them assess whether additional weight management treatment is appropriate and safe given your complete health picture.
What's the difference between Mounjaro and ADHD medication in terms of how they work?
ADHD medications (like methylphenidate or atomoxetine) affect neurotransmitters in the brain to improve focus and attention. Mounjaro is a weight management injection that affects hormone pathways controlling appetite and metabolism. They work on completely different systems and are not substitutes for one another.
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.