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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Still Hungry On Mounjaro 2.5 — UK Access & Cost Guide
Feeling still hungry on Mounjaro 2.5 mg is common — the starting dose is designed to help your body adjust gradually, and many people don't experience full appetite suppression until they reach higher doses or switch to alternatives. This guide explains why hunger may persist at lower doses, what it costs to access Mounjaro in the UK, and how the dose titration process works as your prescriber adjusts your treatment over time.
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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.
Mounjaro 2.5mg and Hunger — Why It Happens & What It Costs in the UK
Mounjaro 2.5 mg is your starting dose — it's designed to help your body tolerate the medication rather than deliver maximum appetite suppression. At this dose, many people still experience normal hunger signals or only mild appetite reduction. Dose titration happens gradually: you stay on 2.5 mg for 4 weeks, then increase to 5 mg, then 7.5 mg, continuing upwards to 15 mg maximum as tolerated.
Clinical trials showed average weight loss of 15–21% on the full tirzepatide range, but results at the starting dose are modest. If you're still hungry on 2.5 mg, this is not a treatment failure — it's a signal that you may need to progress to your next dose. Your prescriber will assess your tolerance and side effects before increasing.
In the UK, Mounjaro is available via the NHS through specialist tier 3 weight management services, though availability and waiting times vary significantly by region. Private access is available through GPhC-registered online pharmacies following a clinical assessment — typical monthly costs range from £129 to £250 depending on your dose, though the 2.5 mg starter dose is usually at the lower end of this range.
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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 — Which Route Suits You?
NHS route: Referral from your GP to a specialist weight management service. Free treatment but often involves waiting lists of weeks to months. Access depends on your ICB region and local service availability. NICE has approved tirzepatide for NHS use, but not all areas have sufficient capacity.
Private route: Online consultation with a UK-licensed prescriber, prescription issued if eligible, dispensed by a UK pharmacy. Faster access (often 7–14 days), available without NHS referral, but you pay the full cost. An online consultation typically costs £20–£50 and covers eligibility assessment.
Neither route requires you to stay on 2.5 mg if hunger persists — both can progress your dose according to tolerance. Using our free GLP-1 weight loss calculator can help you project potential outcomes at different doses and costs.
- 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.
Why am I still hungry on Mounjaro 2.5 mg?
Mounjaro 2.5 mg is the starting dose designed to help your body adjust, not to deliver full appetite suppression. Most people need to progress through higher doses (5 mg, 7.5 mg, 10 mg, etc.) to experience significant appetite reduction. Hunger at this dose is very common and expected.
How much does Mounjaro cost in the UK?
On the NHS, Mounjaro is free if prescribed through a specialist service, but waiting times vary by region. Privately, costs typically range from £129–£250 per month depending on dose — the 2.5 mg starter dose is usually around £129–£150. Prices vary between pharmacies and prescribers.
When should I increase my dose if I'm still hungry?
Your prescriber will advise dose increases based on your tolerance and side effects. Standard practice is to stay on each dose for 4 weeks before increasing. If 2.5 mg is well tolerated but you're still experiencing significant hunger, discuss progression to 5 mg at your next review — typically around week 4–5.
Is Wegovy better than Mounjaro if I'm still hungry?
Mounjaro and Wegovy are both effective, but Wegovy may not provide better appetite suppression at equivalent doses — they work via different mechanisms. Some people respond better to one than the other. Mounjaro uses dual GIP and GLP-1 pathways, while Wegovy uses GLP-1 alone. A prescriber can discuss which suits you better.
How long does it take to notice appetite suppression on Mounjaro?
Most people notice reduced appetite within 3–7 days of each dose increase, though effects vary. At 2.5 mg, suppression is typically mild. As you progress to 5 mg and higher doses, most people report stronger effects. Full appetite suppression often emerges around doses of 10 mg and above.
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.