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 7.5 Not Working — What You Need to Know
If your Mounjaro 7.5 mg dose doesn't seem to be delivering results, you're not alone. Weight loss outcomes vary significantly between individuals, and your prescriber may need to adjust your tirzepatide dose, review your approach, or discuss alternatives like Wegovy. Understanding your options — both on the NHS and through private prescribing — can help you make an informed decision about next steps and what they might cost in the UK.
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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.
Why Mounjaro 7.5 Might Not Be Delivering Results
Several factors can affect how well Mounjaro works at any dose, including the 7.5 mg maintenance level. Individual response varies significantly — clinical trials showed average weight loss of 15–21% body weight, but not everyone experiences results at the same rate or degree.
- Dose timing: Mounjaro works best when paired with consistent reduced-calorie diet and increased physical activity. Without dietary changes, results plateau.
- Medication tolerance: Some people's bodies adapt to GLP-1 agonists over time, requiring dose escalation to 10 mg, 12.5 mg, or the maximum 15 mg dose.
- Side effects limiting adherence: Nausea, constipation, or other common side effects may prevent you from taking the dose as prescribed, reducing effectiveness.
- Medical factors: Unmanaged thyroid conditions, PCOS, or other metabolic conditions can interfere with weight loss even on medication.
- Absorption issues: Certain digestive conditions or other medications you're taking may affect how well tirzepatide is absorbed.
Your prescriber may recommend dose escalation to 10 mg or higher, or exploring alternative weight management medications if 7.5 mg isn't delivering the results you need.
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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.
NHS vs Private Prescribing — Cost and Access Routes
In the UK, there are two main routes to access Mounjaro if your current dose isn't working:
- NHS specialist services: If prescribed through an NHS tier 3 weight management service, medication adjustments and escalations are managed by your specialist team at no additional cost. However, availability varies by region and waiting lists can be lengthy.
- Private online prescribing: Private UK-licensed prescribers assess your suitability via online consultation (typically £20–£50). If approved, your prescription is dispensed by a GPhC-registered pharmacy. Private Mounjaro costs range from approximately £129–£280 per month depending on dose — higher doses cost more. Private access means you can escalate doses or switch to alternatives like Wegovy more quickly without NHS waiting lists.
Your prescriber will discuss which option suits your circumstances. Use our GLP-1 weight loss calculator to explore projected outcomes at different doses before your next appointment.
- 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.
What should I do if Mounjaro 7.5 mg isn't working?
Contact your prescriber immediately. They may recommend dose escalation to 10 mg, 12.5 mg, or 15 mg; reviewing your diet and activity levels; or switching to an alternative like Wegovy. Do not adjust your dose yourself. Individual response varies — clinical trials showed average results, but outcomes differ significantly between people.
Can I escalate my Mounjaro dose without waiting months?
On the NHS, escalation timelines depend on your specialist service's availability. Via private prescribing, you can request dose changes after the standard 4-week interval at each dose level. Private escalations typically happen faster, though you'll pay for each higher dose out of pocket.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs vary by dose and provider. At 7.5 mg, expect approximately £160–£220 per month. Higher doses (10 mg, 12.5 mg, 15 mg) cost more — up to £280+ monthly. Always check with your prescriber and pharmacy for current pricing, as costs fluctuate and discounts may be available.
Is there a cheaper alternative if Mounjaro isn't working?
Wegovy (semaglutide) is another UK-licensed GLP-1 injection. Private costs are typically similar (£130–£200/month depending on dose). NHS options depend on your local tier 3 service's formulary. Your prescriber can advise which alternatives are available to you and recommend the most suitable option.
What if I can't afford to continue Mounjaro privately?
Speak to your prescriber about NHS referral options. Ask your GP to refer you to your local NHS tier 3 weight management service. Alternatively, discuss lower-cost alternatives or payment plans with your private prescriber. Some services offer dose adjustments or medication reviews that may reduce costs. Never stop treatment abruptly — always consult your prescriber first.
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.