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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7.5mg Mounjaro Side Effects: UK Costs and Access
The 7.5mg dose is a standard escalation step in Mounjaro treatment, typically reached after 8–12 weeks of dose titration. At this stage, side effects may differ from lower doses, and understanding both the potential effects and the cost of access in the UK is essential for making an informed decision about continuing treatment. This guide covers what to expect from the 7.5mg Mounjaro dose, the financial implications, and how to access tirzepatide through NHS or private routes 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.
7.5mg Mounjaro: Side Effects and UK Private Costs
At the 7.5mg dose, common side effects typically include nausea, diarrhoea, constipation, and stomach discomfort — though these often improve as your body adjusts over several weeks. Some patients experience reduced appetite, fatigue, or mild dizziness. Gastrointestinal symptoms are most common when starting or increasing doses.
Private prescription costs in the UK vary by provider and dose, but 7.5mg Mounjaro typically costs between £150–£220 per month through registered online pharmacies following a clinical assessment. Costs depend on the specific KwikPen dose and the provider's pricing. Each pen contains 4 weeks of doses. The 7.5mg KwikPen is part of the dose escalation pathway, so you'll have progressed through lower doses (2.5mg, 5mg) before reaching this point.
Try our free GLP-1 weight loss calculator to estimate projected outcomes at different doses, including the 7.5mg stage.
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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 Access: How to Get Mounjaro in the UK
NHS route: You can access Mounjaro through NHS specialist weight management services (tier 3), but availability is extremely limited and varies significantly by region. Your GP can refer you, but waiting times can be several months to over a year in many areas. NICE has approved tirzepatide for NHS use, but funding and provision are restricted.
Private route: You can obtain a prescription from a UK-licensed prescriber through an online consultation without an NHS referral. The process typically takes 24–48 hours: complete an online health questionnaire, a prescriber reviews your medical history, and if approved, a prescription is issued to a GPhC-registered pharmacy. This is faster than NHS routes and gives you immediate access once assessed as suitable.
Check your BMI using our free BMI calculator to understand your eligibility baseline before booking an online consultation.
- 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 are the most common side effects of 7.5mg Mounjaro?
Nausea, diarrhoea, constipation, and stomach pain are most common at the 7.5mg dose. These typically improve within a few weeks as your body adjusts. Less common side effects include fatigue, dizziness, headache, and reduced appetite. Most side effects are mild to moderate and manageable.
How much does 7.5mg Mounjaro cost on private prescription in the UK?
Private prescription costs for 7.5mg Mounjaro typically range from £150–£220 per month through UK online pharmacies. Each KwikPen contains 4 weekly doses. Final cost depends on the specific provider and any clinic consultation fees. Always confirm pricing before prescription.
Can I get Mounjaro on the NHS in the UK?
Yes, Mounjaro is approved by NICE for NHS weight management services, but availability is very limited and varies by region. Access is through specialist tier 3 weight management services, usually with long waiting lists. Private prescription is often faster and more accessible for most UK adults.
What's the difference between 7.5mg Mounjaro and Wegovy in terms of side effects?
Both are weight loss injections with similar gastrointestinal side effects (nausea, diarrhoea, constipation). Mounjaro is a dual GIP+GLP-1 agonist whilst Wegovy is GLP-1 only. Side effect profiles are comparable, though individual responses vary. Your prescriber can advise which suits you better.
Do I need a prescription from my GP to get Mounjaro privately?
No. You can obtain a Mounjaro prescription directly through an online clinical assessment with a UK-licensed prescriber without a GP referral. You'll complete a health questionnaire, and a prescriber reviews your eligibility. If approved, your prescription is sent to a pharmacy.
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.