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 Dry Mouth — UK Costs and Access
Dry mouth is a common side effect reported by some people taking Mounjaro (tirzepatide) in the UK. If you're considering this prescription weight management injection, understanding both the costs and access routes — whether through the NHS or private prescription — can help you make an informed decision. This guide covers everything you need to know about accessing Mounjaro in the UK and what it actually costs.
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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.
UK Private Prescription Costs for Mounjaro
Private prescription Mounjaro costs in the UK vary depending on the dose and the prescribing service you use. Typical private costs range from £129 to £320 per month, depending on which dose you're prescribed (starting doses like 2.5 mg are generally less expensive, while maintenance doses up to 15 mg may be more costly). Each KwikPen contains four weekly injections, so monthly costs reflect a full four-week supply. It's important to note that private prescribing prices are not regulated — different online prescribing services set their own fees. When comparing costs, ensure you're looking at the total cost per month, including the prescriber consultation fee (typically £20–£50) and the medication cost combined.
- Starting doses (2.5 mg): generally £129–£180/month
- Mid-range doses (5–10 mg): typically £180–£250/month
- Higher maintenance doses (12.5–15 mg): often £250–£320/month
- Prescription fee: usually included or £20–£50 separately
These are approximate ranges based on current market pricing. Always check the exact cost with your chosen prescriber before proceeding, as prices and availability change regularly.
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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 Routes for Mounjaro in the UK
The NHS route involves referral to a tier 3 specialist weight management service through your GP. NICE (National Institute for Health and Care Excellence) has approved tirzepatide for use within NHS specialist weight management services, but access is limited to designated centres and waiting times can be several months to over a year in many areas. Regional variation is significant — some ICBs (Integrated Care Boards) have shorter waiting lists than others. The private route offers faster access: you complete an online consultation with a UK-licensed prescriber, and if approved, receive a prescription to be dispensed by a GPhC-registered pharmacy. Private access typically takes days rather than months. Both routes require you to meet eligibility criteria (BMI 30 or above, or BMI 27–29.9 with weight-related health conditions), and in both cases, you'll need to manage the medication alongside a reduced-calorie diet and increased physical activity.
- 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 much does Mounjaro cost on prescription in the UK privately?
Private Mounjaro costs typically range from £129–£320 per month depending on the dose prescribed. Starting doses (2.5 mg) tend to cost less, while higher maintenance doses (15 mg) may cost more. Prices vary between prescribing services, so it's worth comparing. Always ask about the total cost including any consultation fee before you commit.
Can I get Mounjaro free on the NHS?
Yes, Mounjaro (tirzepatide) is available on the NHS through specialist tier 3 weight management services. However, you must be referred by your GP, and access is limited. Waiting times can be months to over a year depending on your region. Not all areas have the same level of provision. Ask your GP about local availability and referral options.
What's the difference between Mounjaro and Wegovy in terms of UK cost?
Both are prescription weight management injections, but costs differ. Mounjaro (tirzepatide) typically ranges from £129–£320/month privately, while Wegovy (semaglutide) costs roughly £150–£280/month, depending on dose. NHS availability and waiting times also vary by medication and region. A prescriber can advise which is more suitable for you.
How long does it take to get Mounjaro privately in the UK?
Private access is usually much faster than NHS. You can typically complete an online consultation within a few days, receive a prescription if approved, and have your medication delivered within 5–10 working days. NHS access through specialist services can take months to over a year due to referral and waiting lists.
Do I need to see my GP before using Mounjaro?
For NHS access, yes — your GP refers you to specialist weight management services. For private prescription, you don't need GP involvement, but you will need an online clinical assessment with a UK-licensed prescriber. Your medical history, current medications, and health conditions will be reviewed to ensure Mounjaro is safe and appropriate for you.
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.