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 and ADHD: What You Need to Know About Access and Cost
Mounjaro (tirzepatide) is not approved by the MHRA for treating ADHD. It is a prescription-only injection licensed specifically for weight management in UK adults with a BMI of 30 or above, or 27 or above with weight-related health conditions. If you have ADHD and are concerned about weight, this guide explains how to access weight management support through the NHS, the costs of private Mounjaro prescription routes, and realistic expectations about what medication can address.
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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 Mounjaro Costs and Prescription Routes in the UK
Private online prescription costs vary by dose and provider. A single Mounjaro KwikPen (4 weeks supply at one dose) typically costs:
- 2.5 mg starting dose: approximately £129–£160
- 5 mg maintenance: approximately £145–£180
- 10 mg: approximately £180–£220
- 15 mg maximum dose: approximately £220–£280
Costs assume standard dose titration over 16+ weeks. Private prescribing requires an online clinical assessment from a UK-licensed prescriber and dispensing through a GPhC-registered pharmacy. Prices exclude delivery. Some providers offer discount packages for multiple pens purchased together. Always confirm costs and what is included before ordering.
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: What to Expect and Your Options
NHS route: Mounjaro is available through specialist tier 3/4 weight management services, not standard GP prescription. You typically need a GP referral, though availability varies significantly by region and local ICB funding. NHS waiting lists can be lengthy—in some areas, several months to over a year. NICE has approved tirzepatide (Mounjaro) for use, but regional access remains inconsistent.
Private route: Faster access without NHS referral. You complete an online assessment with a UK-licensed prescriber who decides if Mounjaro is clinically appropriate. If approved, a prescription is issued and dispensed by a pharmacy. Requires you to manage dose titration and ongoing prescriptions. Neither route addresses ADHD—if you have ADHD, discuss separate ADHD management with your GP first.
- 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 Mounjaro treat ADHD?
No. Mounjaro (tirzepatide) is licensed for weight management only, not for ADHD treatment. If you have ADHD and weight concerns, these require separate management strategies. Discuss ADHD medication options with your GP, and separately explore weight management routes if appropriate for your health.
How much does a Mounjaro prescription cost privately in the UK?
Private costs range from approximately £129–£280 per KwikPen (4 weeks), depending on dose and provider. Starting doses (2.5–5 mg) are typically £145–£180. Maximum doses (15 mg) cost around £220–£280. Costs vary between providers—always confirm before ordering.
Can I get Mounjaro free on the NHS if I have ADHD?
ADHD is not a weight-related health condition that qualifies for NHS Mounjaro access. You must meet standard criteria: BMI ≥30, or BMI 27–29.9 with conditions like type 2 diabetes, hypertension, or sleep apnoea. Referral is through a GP to specialist tier 3/4 weight management services, not standard prescription.
What's the difference between NHS and private Mounjaro routes?
NHS requires a GP referral to specialist services and may have long waiting lists; availability varies by region. Private prescription is faster—you have an online assessment with a UK-licensed prescriber and prescription dispensed by a pharmacy. Private costs apply. Both require clinical assessment; neither treats ADHD separately.
How long does dose titration take with Mounjaro?
Standard Mounjaro dose titration takes 16–20 weeks to reach maximum dose (15 mg). You start at 2.5 mg for 4 weeks, then increase to 5 mg, 7.5 mg, 10 mg, 12.5 mg, and finally 15 mg—each step lasting 4 weeks. Your prescriber may adjust timing based on your response and side effects.
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.