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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Next Day Delivery Mounjaro in the UK
If you're searching for next day delivery Mounjaro in the UK, you've likely already had a clinical assessment and received a prescription. Mounjaro (tirzepatide) is a prescription-only weight management injection available through NHS specialist services and private online prescribing. Delivery timescales depend on where you obtain your prescription and which pharmacy dispenses it. This guide explains how Mounjaro is supplied in the UK and what delivery options are typically available.
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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.
How Mounjaro Prescription Supply Works in the UK
Mounjaro is a prescription-only medicine — you cannot buy it without a valid prescription from a UK-licensed prescriber. Once you have a prescription, a GPhC-registered pharmacy can dispense it. Supply works as follows:
- NHS route: Prescribed through tier 3 specialist weight management services. Delivery times vary by region; some services deliver within days, others may have longer waits depending on service capacity.
- Private online prescribing: After an online clinical assessment with a UK-licensed prescriber, if approved, your prescription is sent to a pharmacy. Many private providers advertise next-day or 24-hour delivery options, though this depends on order timing and stock availability.
- Each Mounjaro KwikPen contains 4 weeks of doses (four weekly injections). Repeat prescriptions follow the same process — assessment, prescription, dispensing, and delivery.
- Storage: Your Mounjaro must arrive in a cool bag with ice packs if ambient temperature is expected to exceed 25°C during transit, to protect the medication.
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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.
What to Expect With Next Day Delivery Options
Most private online prescribing services in the UK offer next-day delivery as standard, though "next day" typically means next working day. Orders placed before a cut-off time (usually 2–3pm) are dispatched the same day and arrive the following day. Orders placed after the cut-off or on weekends may be dispatched the next working day, arriving within 2–3 days.
Before ordering, check the pharmacy's delivery terms — some charge for next-day delivery, others include it. Always verify the pharmacy is GPhC-registered to ensure you're buying from a legitimate, regulated source. Your prescription should be valid for 6 months from the date issued, giving you time to arrange repeat supplies. Once you start Mounjaro, you'll need ongoing prescriptions for continued supply — the initial assessment covers your first prescription only.
Track your weight loss progress as you continue Mounjaro treatment using our free progress tracker — it helps you monitor not just weight, but also how you're feeling and managing side effects over weeks and months.
- 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 Mounjaro with next day delivery in the UK without a prescription?
No. Mounjaro is prescription-only. You must have a valid prescription from a UK-licensed prescriber before any pharmacy can dispense it. You cannot buy it over the counter or without a clinical assessment first.
How long does Mounjaro take to arrive if I order it privately?
Most private online providers advertise next-day or 24-hour delivery if you order before their cut-off time (typically 2–3pm). Orders placed after this or on weekends arrive within 2–3 working days. Always check the specific provider's delivery terms before ordering.
Is next day delivery available through the NHS for Mounjaro?
NHS delivery timescales vary significantly by region and specialist service. Some services deliver within days; others have longer waits. Contact your local tier 3 weight management service for their specific delivery schedule.
What happens if Mounjaro arrives damaged during next day delivery?
Contact the pharmacy immediately with photos of the damaged packaging. They will typically replace it at no charge. Store any damaged medication carefully and follow the pharmacy's instructions for disposal or return.
Do I need a new prescription every time I order Mounjaro for next day delivery?
Your initial prescription covers your first KwikPen (4 weeks). For repeat supplies, you'll need a repeat prescription from your prescriber. Some services handle repeat prescriptions automatically; others require you to request them.
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.