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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Tirzepatide 10mg — What You Need to Know
Tirzepatide 10mg is a mid-range dose of Mounjaro, the GLP-1 and GIP receptor agonist weight loss injection licensed in the UK. At this dose, clinical trials showed participants lost an average of around 19.5% of their body weight over 72 weeks, alongside a reduced-calorie diet and increased physical activity. Tirzepatide is a prescription-only medicine requiring a clinical assessment before use. Individual results vary significantly depending on lifestyle, metabolism, and how your body responds to the medication. This guide covers how the 10mg dose works, what to expect, and UK access routes.
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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.
How Tirzepatide 10mg Works in Your Body
Tirzepatide is a dual GIP and GLP-1 receptor agonist — a key difference from single-mechanism weight loss injections. It activates two natural hormone pathways that work together to reduce appetite, increase feelings of fullness, and support healthy weight management.
At the 10mg dose, the medication reaches a mid-therapeutic level. The GLP-1 pathway slows gastric emptying (how quickly food leaves your stomach) and signals to your brain that you're satisfied. The GIP pathway helps regulate energy usage and fat storage. Together, these mechanisms may help you eat smaller portions and reduce food cravings.
- Tirzepatide is not insulin — it works differently and is suitable for both diabetic and non-diabetic adults
- The 10mg weekly injection is given via a KwikPen pre-filled device
- Effects typically build gradually over the first 4–8 weeks as your body adjusts
- The medication slows gastric emptying, though this effect often reduces over time with continued use
Most users reach the 10mg dose after starting at 2.5mg and titrating upwards over 8–12 weeks, allowing your body to adapt and minimising nausea and other side effects.
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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.
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Tirzepatide 10mg — Weight Loss and UK Eligibility
In the SURMOUNT-1 clinical trial, participants on 10mg tirzepatide lost an average of 19.5% of their body weight over 72 weeks. However, individual results vary — some people lose more, others less, depending on diet adherence, physical activity, metabolism, and genetics. Results are always achieved alongside lifestyle changes, never from medication alone.
In the UK, you may be eligible for tirzepatide if you have a BMI of 30 or above, or BMI of 27–29.9 with weight-related health conditions (type 2 diabetes, hypertension, dyslipidaemia, sleep apnoea, or cardiovascular disease). Adults of South Asian, Chinese, Black African, or Black Caribbean heritage may qualify at lower BMI thresholds (27.5+). Use our free BMI calculator above to check your starting point, and our GLP-1 weight loss calculator to estimate potential outcomes at the 10mg dose.
- Prescription-only — requires clinical assessment with a GP or licensed prescriber
- Available through NHS specialist weight management services (tier 3/4) or private online prescribing
- Eligibility assessed individually — not all patients are suitable candidates
- 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.
How long does it take to reach the 10mg dose of tirzepatide?
Most people start at 2.5mg and increase every 4 weeks: 2.5mg (weeks 1–4), 5mg (weeks 5–8), 7.5mg (weeks 9–12), then 10mg (week 13+). This gradual approach allows your body to adjust and reduces side effects like nausea. Some people stay at 7.5mg if it's effective for them — your prescriber decides the right dose for you.
What's the difference between tirzepatide 10mg and other Mounjaro doses?
Lower doses (5mg, 7.5mg) may provide benefit for some people; higher doses (12.5mg, 15mg) may work better for others. The 10mg dose sits in the mid-range and was one of the main doses tested in clinical trials. Your prescriber will recommend the dose most likely to work for your individual circumstances.
What are the main side effects of tirzepatide 10mg?
Very common side effects include nausea, constipation, diarrhoea, and stomach pain. These are usually mild, improve over time, and are often reduced by starting at a lower dose and titrating upwards slowly. Serious side effects are rare but can include severe stomach pain (pancreatitis) or gallbladder problems — seek immediate medical attention if these occur.
Can I get tirzepatide 10mg on the NHS in the UK?
Yes — tirzepatide (Mounjaro) is approved by NICE for NHS use in specialist weight management services (tier 3/4). However, availability and waiting lists vary significantly by region. Many people access it through private prescribing via online clinics registered with the GPhC, which is often faster and doesn't require an NHS referral.
How much weight loss should I expect from tirzepatide 10mg?
Clinical trials showed an average loss of 19.5% of body weight at the 10mg dose over 72 weeks alongside diet and exercise. Individual results vary — some lose more, some less. Factors affecting your result include adherence to diet and exercise, starting weight, metabolism, and how your body responds. Use our GLP-1 weight loss calculator to see estimated projections based on your profile.
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.