The UK's most complete GLP-1 guide
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- 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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Next Day Mounjaro in the UK — Cost, Access & How It Works
If you're searching for next day Mounjaro in the UK, you're likely considering prescription weight management with tirzepatide. This guide explains how to access Mounjaro quickly through private prescribing, what it costs, and how the process differs from NHS routes. We'll cover eligibility, online consultation timelines, and realistic expectations for next-day delivery. Whether you're comparing Mounjaro vs Wegovy or exploring GLP-1 options, understanding the cost and access landscape helps you make informed decisions about weight management support in the UK.
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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.
UK Private Mounjaro — Cost and Next-Day Access
Next-day Mounjaro delivery is available through private online prescribing services in the UK, though "next day" depends on several factors: order timing, prescription approval, and pharmacy stock. Most private pharmacies offering Mounjaro KwikPen delivery aim for dispatch within 24 hours of prescription issuance, though some may take 2–3 working days.
Cost for private Mounjaro: Typical pricing ranges from £129–£320 per month depending on dose and provider. Starting doses (2.5 mg) are often cheaper than maintenance doses (10 mg, 15 mg). Private costs do not include NHS subsidy — you pay the full pharmacy price.
- 2.5 mg starter pack: approximately £129–£180
- 5 mg maintenance: approximately £160–£210
- 10 mg dose: approximately £200–£280
- 15 mg maximum dose: approximately £240–£320
Prices vary between providers. Online consultation fees (typically £15–£50) may apply on top of medication costs. Some services bundle consultation and dispensing into a single fee. Always compare total cost, not just medication price, across multiple providers.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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 and Timelines
NHS route: Free on prescription but accessed through specialist tier 3 weight management services. Your GP refers you; waiting lists in many regions are 6–18+ months. NICE has approved tirzepatide for NHS use, but regional ICB funding varies significantly.
Private route: Faster access — typically within days of online consultation. You don't need GP referral. A UK-licensed prescriber reviews your medical history via online questionnaire, issues a prescription if appropriate, and a GPhC-registered pharmacy dispenses it.
Online consultation process: Complete health questionnaire (10–15 minutes), prescriber assessment (24–48 hours), prescription issued, pharmacy dispatches. Total time from consultation to delivery: 2–5 working days typically. Use our free BMI calculator to confirm your starting eligibility before booking a 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.
Can I get next-day Mounjaro delivery in the UK?
Most private pharmacies aim to dispatch within 24 hours of prescription approval, but "next day" delivery isn't assured. Actual timelines depend on when you complete your consultation, prescriber review speed, and pharmacy stock levels. Order before 2 PM on a weekday for fastest service; weekend orders may not process until Monday.
Is Mounjaro cheaper on the NHS or private?
Mounjaro is free on NHS prescription, but NHS access requires referral to specialist weight management services with significant waiting lists (often 6–18 months). Private Mounjaro costs £129–£320 monthly depending on dose. If you can access NHS quickly, it's free; if you prefer immediate access, private costs apply.
What happens during an online Mounjaro consultation?
You'll complete a medical questionnaire covering health conditions, medications, allergies, and family history (10–15 minutes). A UK-licensed prescriber reviews this, usually within 24–48 hours. If approved, they issue an electronic prescription to a GPhC-registered pharmacy, which dispenses and ships your Mounjaro KwikPen.
Do I need a GP referral to get private Mounjaro?
No. Private prescribing services assess you independently through online consultation — no GP referral is required. However, informing your GP that you're starting Mounjaro is advisable so they can monitor your progress and adjust any other medications if needed.
What's the difference between Mounjaro and Wegovy for UK access?
Both are prescription-only weight loss injections available via NHS specialist services or private prescribing. Mounjaro (tirzepatide) is a dual GIP/GLP-1 agonist; Wegovy (semaglutide) is a GLP-1 agonist only. Mounjaro typically costs slightly more privately. Clinical trial data shows Mounjaro achieved slightly higher average weight loss, though individual results vary significantly.
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.