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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ADHD and Mounjaro — What UK Adults Should Know
ADHD (attention deficit hyperactivity disorder) is a neurodevelopmental condition that affects many UK adults. If you have ADHD and are considering Mounjaro (tirzepatide) for weight management, it's important to understand how these conditions interact and what your GP or prescriber needs to know. This guide covers NHS eligibility, prescribing considerations, and practical information for UK adults managing both ADHD and weight.
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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.
NHS Eligibility and ADHD Considerations
Mounjaro is a prescription-only GIP and GLP-1 receptor agonist licensed in the UK for weight management in adults with a BMI of 30 kg/m² or above, or 27 kg/m² with weight-related health conditions such as type 2 diabetes or cardiovascular disease. Having ADHD does not automatically affect your eligibility for Mounjaro through NHS tier 3 specialist weight management services or private prescribing.
However, your prescriber must assess your full medical history, including ADHD and any ADHD medications you take. Some ADHD medications (particularly stimulants like methylphenidate or amphetamines) can affect appetite and may interact with Mounjaro's effects on gastric motility and appetite regulation. Your GP or the prescriber conducting your clinical assessment needs to know about your ADHD diagnosis and current treatment to ensure Mounjaro is safe and appropriate for you.
NICE guidance on weight management does not list ADHD as a contraindication to tirzepatide, but individual clinical assessment is essential, particularly if you take ADHD medication.
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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.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
ADHD Medication and Mounjaro Interactions
Stimulant ADHD medications (methylphenidate, lisdexamfetamine, amphetamines) are known appetite suppressants. When combined with Mounjaro—which also reduces appetite through GLP-1 and GIP pathways—you may experience more pronounced appetite loss or nausea. This is not necessarily dangerous, but your prescriber needs to monitor you closely and adjust doses as needed.
Non-stimulant ADHD medications (atomoxetine, guanfacine) have fewer appetite-related effects, so the interaction risk is lower.
Always inform your prescriber of your ADHD medication name and dose. They will discuss whether a lower starting dose of Mounjaro, slower dose titration, or dietary adjustments might be advisable. Use our free BMI calculator and GLP-1 weight loss calculator to understand your baseline health metrics before your assessment.
Reporting side effects matters. If you experience excessive nausea, dizziness, or difficulty concentrating after starting Mounjaro, contact your prescriber immediately. Some people report that reduced appetite affects their ability to take ADHD medication with food (some require food for optimal absorption), so managing meals becomes more complex. Your prescriber and GP can help coordinate this.
Access to Mounjaro in the UK is through NHS tier 3 specialist weight management services (following GP referral) or private online prescribing following a clinical assessment. In both cases, your ADHD diagnosis and medications are relevant medical history that must be disclosed. Don't assume your ADHD prevents you from being prescribed Mounjaro—but do be transparent about it during 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.
Can I take Mounjaro if I have ADHD?
Yes, ADHD itself is not a contraindication to Mounjaro. However, your prescriber must know about your ADHD diagnosis and medications during clinical assessment. If you take stimulant ADHD medication, your prescriber may suggest closer monitoring or slower dose escalation because both Mounjaro and stimulants suppress appetite. Always disclose your ADHD treatment before starting tirzepatide.
Will Mounjaro affect my ADHD medication?
Mounjaro does not directly affect ADHD medications, but combined appetite suppression from both may be significant. Stimulant ADHD drugs are already appetite suppressants, so taking Mounjaro alongside them could increase nausea or reduce food intake. Your prescriber can discuss managing this—for example, by starting Mounjaro at a lower dose or adjusting your ADHD medication timing with meals.
What should I tell my GP about ADHD when seeking Mounjaro?
Tell your GP your ADHD diagnosis, the specific ADHD medication you take (name and dose), how long you've been on it, and whether it affects your appetite. Also mention any side effects you've experienced with ADHD medication. This helps your GP decide whether to refer you to NHS tier 3 services or a private prescriber and ensures whoever assesses you has complete medical information.
Is Mounjaro available on the NHS if I have ADHD?
Mounjaro is available through NHS tier 3 specialist weight management services for adults meeting weight criteria (BMI ≥30 or ≥27 with health conditions). ADHD does not change eligibility. NHS availability varies by region and waiting times can be long. Private prescribing is also available following online clinical assessment if you prefer faster access.
What if Mounjaro and my ADHD medication cause too much nausea?
Contact your prescriber or GP immediately. They can review your doses, adjust timing, or discuss alternatives. Some people benefit from slower Mounjaro dose titration, dietary changes, or anti-nausea strategies. Your prescriber may also review whether your ADHD medication needs adjustment. Never stop either medication without medical guidance—both require careful tapering if discontinued.
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