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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10mg Mounjaro Side Effects — UK Cost and Access
If you're considering Mounjaro (tirzepatide) 10mg for weight management in the UK, understanding both the potential side effects and how to access the medication is essential. This guide covers what side effects you might experience at the 10mg dose, how much Mounjaro costs through different routes in the UK, and whether you can access it through the NHS or need to explore private prescription options. Individual experiences vary significantly, so it's important to discuss your personal circumstances with a GP or licensed prescriber before starting any weight loss medication.
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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.
10mg Mounjaro Side Effects and UK Prescription Costs
At the 10mg dose, Mounjaro (tirzepatide) is typically used for dose maintenance after escalation from lower doses. Common side effects at 10mg include nausea, diarrhoea, vomiting, constipation, and abdominal pain — these are experienced by more than 1 in 10 users. Less common but significant side effects may include indigestion, headache, fatigue, dizziness, hair loss (alopecia), and injection site reactions such as redness or bruising.
Serious but rare side effects requiring immediate medical attention include severe stomach pain radiating to the back (possible pancreatitis), gallbladder complications, serious allergic reactions (facial or throat swelling), and changes in vision. The 10mg dose is typically reached after 12 weeks of dose escalation, giving your body time to adjust. Many gastrointestinal side effects diminish over time as your body adapts. Most users find side effects are manageable with dietary adjustments — eating smaller, less fatty meals often helps significantly. Our GLP-1 weight loss calculator can help you understand projected outcomes alongside realistic expectations about the adjustment period.
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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.
How to Access 10mg Mounjaro in the UK — NHS vs Private Routes
NHS access: Mounjaro is approved by NICE for weight management through tier 3 specialist weight management services. However, NHS availability varies dramatically by region and waiting lists can be very long — in some areas, waiting times exceed 12–18 months. You'll need a GP referral to a specialist service.
Private prescription route: You can obtain Mounjaro privately through a UK-licensed prescriber following an online consultation, typically costing £129–£320 per month depending on your dose. A GPhC-registered pharmacy will dispense your prescription. The 10mg dose KwikPen contains 4 weeks of injections. Private access is faster — often within days — and doesn't require NHS referral. Use our BMI calculator to check your eligibility criteria before pursuing either route, and always consult a healthcare professional about which option suits your circumstances.
- 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's the difference between 10mg Mounjaro and other doses?
At 10mg, you're typically at a maintenance dose after gradual escalation from 2.5mg. Clinical trials showed 10mg produces an average weight loss of around 19.5% of body weight, though results vary. Gastrointestinal side effects are usually more settled by the time you reach 10mg if you've escalated gradually, as your body has adjusted over the previous weeks.
How much does 10mg Mounjaro cost privately in the UK?
Private costs typically range from £150–£280 per month depending on the provider and prescription pathway. Each KwikPen (one month's supply of 4 injections) varies in price. NHS access is free but subject to regional availability and specialist referral pathways. Always check current pricing with providers, as costs fluctuate.
Can I get Mounjaro through the NHS for weight management?
Yes, Mounjaro is NICE-approved for NHS weight management services. However, access is through tier 3 specialist services, not standard GP prescription. Waiting lists vary dramatically by region — some areas have minimal waits while others have 12+ month queues. Your GP can refer you to check local availability and waiting times.
Is Mounjaro the same as Wegovy?
No. Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist, while Wegovy (semaglutide) is GLP-1 only. Mounjaro's dual mechanism may produce slightly better weight loss outcomes on average, but both are prescription-only and require clinical assessment. Side effects are similar between the two medications.
How long do 10mg Mounjaro side effects typically last?
Gastrointestinal side effects like nausea and diarrhoea are usually most intense in the first 1–2 weeks after starting or increasing dose, then gradually settle over 4–8 weeks as your body adapts. However, some users experience persistent mild symptoms. Dietary changes often help significantly. If side effects remain severe, speak with your prescriber about dose reduction or alternative options.
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.