Swapping From Mounjaro to Wegovy: Your Complete Slinic Guide for 2026
How to switch safely, what to expect, and the cost difference between the two treatments
Clinically reviewed by
Shadeia Younis, Superintendent Pharmacist (GPhC 2052119)
If you’re currently on Mounjaro and considering Wegovy, you’re likely weighing up a mix of factors: cost, side effects, clinical results, and how the switch actually works. This guide explains everything you need to know — from the 7-day gap between medications to expected weight loss differences, dose conversions, and what Wegovy costs compared to Mounjaro at Slinic.
Wegovy contains semaglutide and works on one appetite pathway (GLP-1). Mounjaro contains tirzepatide and works on two (GLP-1 and GIP). Both are once-weekly injections, both are licensed for weight management in the UK, and switching between them is medically straightforward when done under proper clinical guidance.
The Short Answer
Yes — you can switch from Mounjaro to Wegovy safely with the right clinical guidance. The transition involves a 7-day gap between your last Mounjaro injection and your first Wegovy injection, restarting at the Wegovy 0.25mg starter dose, and titrating up over several months.
At Slinic, Wegovy ranges from £99.99 to £209.99 monthly compared to Mounjaro’s £139 to £285 — and pricing includes the medication, pharmacist consultation, and delivery with no hidden fees.
What’s on this page
Understanding Mounjaro and Wegovy: What’s Different?
Both medications are once-weekly injectable treatments approved for weight management in the UK, but they work through slightly different mechanisms.
How Mounjaro works
Tirzepatide acts as a dual agonist, mimicking two natural hormones — GLP-1 and GIP. This dual action explains why clinical trials (SURMOUNT-1, NEJM 2022) showed mean weight loss of 22.5% at 15mg over 72 weeks.
How Wegovy works
Semaglutide focuses on GLP-1 receptors only. The STEP-1 trial (NEJM 2021) demonstrated approximately 15% mean weight loss over 68 weeks at the 2.4mg maintenance dose.
Head-to-head clinical data
The SURMOUNT-5 trial (NEJM 2025) directly compared the two medications. Over 72 weeks, tirzepatide achieved 20.2% mean weight loss vs 13.7% for semaglutide. This makes Mounjaro the more potent treatment in clinical trials — though individual responses can vary significantly and many patients achieve excellent results on either medication.
Clinical Trial Results Comparison
| Trial | Medication | Duration | Mean Weight Loss |
|---|---|---|---|
| SURMOUNT-1 | Mounjaro 15mg | 72 weeks | 22.5% |
| SURMOUNT-1 | Mounjaro 10mg | 72 weeks | 21.4% |
| SURMOUNT-1 | Mounjaro 5mg | 72 weeks | 16.0% |
| STEP-1 | Wegovy 2.4mg | 68 weeks | 14.9% |
| SURMOUNT-5 (head-to-head) | Tirzepatide vs Semaglutide | 72 weeks | 20.2% vs 13.7% |
What this means in practice: Mounjaro is the more potent treatment on average, but Wegovy remains highly effective for sustainable weight management. Cost, side effect tolerance, and personal preference all factor into the right choice for you.
Why Patients Switch From Mounjaro to Wegovy
Several reasons typically drive patients to consider switching:
Cost considerations
Mounjaro is generally more expensive than Wegovy. At Slinic, Wegovy ranges from £99.99 to £209.99 monthly, while Mounjaro ranges from £139 to £285. For patients on long-term treatment, the cost difference can be significant over time.
Side effect tolerance
Some patients tolerate semaglutide better than tirzepatide. If you’ve struggled with persistent nausea, digestive issues, or other Mounjaro side effects, Wegovy may suit your body differently. The single-action mechanism sometimes causes milder side effects, though individual responses vary.
Treatment sustainability
Long-term weight management requires treatment you can consistently afford. Switching to a lower-priced option can make sustained treatment more realistic over multiple years.
Personal preference
Some patients simply respond differently to different medications. There’s no universal “best” — finding what works for your body, budget, and lifestyle matters most.
The opposite direction
If you’re considering switching the other way (Wegovy to Mounjaro), see our guide on switching from Wegovy to Mounjaro safely.
Thinking About Starting Wegovy?
The Slinic online consultation takes around three minutes. A pharmacist reviews your information within 24 hours — and pricing is transparent from the first dose.
Start Your Confidential ConsultationCan You Switch From Mounjaro to Wegovy Safely?
Yes. Switching between these medications is medically safe and straightforward when done under proper clinical guidance.
Essential safety requirements
The 7-day gap
A 7-day gap between your final Mounjaro injection and starting Wegovy is generally recommended. This gap prevents medication overlap, since both medications have week-long half-lives and continue working in your system for several days after injection.
Clinical assessment
Although both medications treat weight loss, each requires independent medical review. A prescriber will assess your current health status, review your Mounjaro experience, and confirm Wegovy’s suitability before approving the switch.
Eligibility criteria for Wegovy
- BMI of 30 or above, or 27+ with a weight-related condition
- Age 18 or older
- No allergies to semaglutide or Wegovy ingredients
- No contraindications (pregnancy, certain thyroid conditions, severe gastroparesis)
When Wegovy may not be suitable
If you’re allergic to semaglutide, currently pregnant or planning pregnancy, have a personal or family history of medullary thyroid carcinoma, or have multiple endocrine neoplasia syndrome type 2, Wegovy isn’t suitable. Your prescriber will discuss alternative options.
Step-by-Step Guide: How to Switch From Mounjaro to Wegovy
Most patients complete the switch within approximately 10-14 days. Here’s how the process typically works at Slinic.
1Preparation and Research
Before switching, gather the relevant information you’ll need for your consultation:
- Your current Mounjaro dose and how long you’ve been on it
- Weight tracking records showing your progress to date
- List of any side effects you’ve experienced
- Date of your last Mounjaro injection (or planned last injection)
- Your treatment goals and any concerns about switching
2Complete the Clinical Consultation
Slinic’s online consultation typically takes around three minutes and covers your medical history, current weight, treatment experience, and goals. A prescriber reviews your information within 24 hours.
3Timing Your Final Mounjaro Injection
You can stop Mounjaro after your consultation is approved or finish your current pen if it’s nearly empty. There’s no need to gradually reduce the dose — you can stop after any weekly injection.
The 7-day waiting period
Mark your calendar clearly. If your last Mounjaro injection is on a Monday, your first Wegovy injection should be the following Monday (or later). During this gap, Mounjaro continues working in your system due to its long half-life, so appetite control typically remains for several days.
4Starting Wegovy
Most patients start Wegovy at the 0.25mg starter dose regardless of their previous Mounjaro dose. This allows your body to adjust to the new medication and helps reduce the risk of side effects.
Standard Wegovy dose escalation schedule
| Weeks | Dose | Stage |
|---|---|---|
| Weeks 1-4 | 0.25mg | Starter dose |
| Weeks 5-8 | 0.5mg | Titration |
| Weeks 9-12 | 1mg | Titration |
| Weeks 13-16 | 1.7mg | Titration |
| Week 17+ | 2.4mg | Maintenance |
Your specific schedule might differ based on tolerance and response. Your prescriber can pause escalation at any dose if side effects need more time to settle.
5Ongoing Monitoring
The first few weeks on Wegovy determine how well you’ll tolerate the medication long-term. Track your appetite, weight, and any side effects, and stay in contact with Slinic’s pharmacist team for guidance through the transition.
What to Expect When Switching
Appetite and Hunger
Week 1 (the 7-day gap): Appetite may gradually return as Mounjaro leaves your system. This doesn’t mean you’ve lost progress — it’s simply the medication clearing.
Weeks 2-4 (starting Wegovy): Your 0.25mg starter dose feels less powerful than your established Mounjaro dose. This is normal and temporary. Appetite control strengthens as you titrate up.
Long-term (months 3-6): Once you reach your optimal Wegovy dose, appetite suppression typically settles into a consistent pattern.
Weight Loss Trajectory
Immediate switch period (weeks 1-4)
Weight loss may slow temporarily during the transition. Your body is adjusting to a new medication at a lower starting dose. Some patients still lose weight slowly during this adjustment period.
Dose escalation period (weeks 5-16): As your Wegovy dose increases, weight loss typically resumes a more consistent pace.
Maintenance phase (month 4+): On the 2.4mg Wegovy dose, clinical trials show mean weight loss of around 15% over 68 weeks from baseline.
Important
You generally won’t lose your Mounjaro progress when switching. Some temporary fluctuation during transition (mostly water weight and appetite-related fluctuations) is normal and typically reverses once Wegovy reaches therapeutic levels.
Side Effects Profile
Wegovy and Mounjaro share similar side effect profiles, but individual tolerance varies significantly.
If you had minimal Mounjaro side effects: You’ll likely tolerate Wegovy well. Starting at a lower dose further reduces side effect risk.
If you struggled with Mounjaro side effects: Some patients find Wegovy easier to tolerate. The single-action mechanism sometimes causes less nausea and fewer digestive issues — though individual responses vary.
Common Wegovy side effects
- Nausea (most common, usually mild and temporary)
- Constipation or diarrhoea
- Stomach discomfort or bloating
- Headaches
- Fatigue
- Injection site reactions
When to seek urgent help
Severe abdominal pain, persistent vomiting preventing hydration, signs of pancreatitis (severe upper stomach pain radiating to back), or allergic reactions require immediate medical attention. Contact your pharmacist or NHS 111 if concerned.
For comprehensive side effect management, see our side effects management guide.
Wegovy and Mounjaro Pricing at Slinic
One of the most common reasons for switching is cost. At Slinic, pricing is transparent at every dose, with no hidden consultation fees or subscription charges.
Mounjaro monthly pricing
| Dose | Monthly Price |
|---|---|
| 2.5mg (starter dose) | £139.00 |
| 5mg | £165.00 |
| 7.5mg | £225.00 |
| 10mg | £255.00 |
| 12.5mg | £275.00 |
| 15mg (maximum dose) | £285.00 |
Wegovy monthly pricing
| Dose | Monthly Price |
|---|---|
| 0.25mg (starter dose) | £99.99 |
| 0.5mg | £114.99 |
| 1mg | £149.99 |
| 1.7mg | £174.99 |
| 2.4mg (maximum dose) | £209.99 |
Potential monthly savings
| Switching From | To Wegovy Equivalent | Monthly Difference |
|---|---|---|
| Mounjaro 15mg (£285) | Wegovy 2.4mg (£209.99) | £75.01 saved |
| Mounjaro 12.5mg (£275) | Wegovy 1.7mg (£174.99) | £100.01 saved |
| Mounjaro 10mg (£255) | Wegovy 1.7mg (£174.99) | £80.01 saved |
| Mounjaro 7.5mg (£225) | Wegovy 1mg (£149.99) | £75.01 saved |
| Mounjaro 5mg (£165) | Wegovy 0.5mg (£114.99) | £50.01 saved |
| Mounjaro 2.5mg (£139) | Wegovy 0.25mg (£99.99) | £39.01 saved |
Both prices include the medication, pharmacist consultation, and delivery. For a full Mounjaro cost breakdown, see our complete Mounjaro cost breakdown.
Managing Your Weight Loss During the Switch
Strategic planning helps maintain your progress through the transition.
The week before switching
Continue your established healthy habits. This isn’t the time to experiment with new diets or intense exercise programmes — consistency keeps progress steady.
- Stock your kitchen with healthy, easily digestible foods
- Plan simple meals for the transition week
- Take your current weight and measurements for comparison
- Set realistic expectations — small temporary fluctuations are normal
During the 7-day gap
What works
- Maintain your normal meal schedule
- Focus on protein and vegetables (keeps you satisfied longer)
- Stay well hydrated (often mistaken for hunger)
- Moderate portions naturally
- Continue light activity (walking, gentle exercise)
What doesn’t work
- Severe calorie restriction (can trigger rebound eating)
- Skipping meals completely
- Weighing yourself daily (normal fluctuations cause unnecessary anxiety)
- Panicking about temporary hunger
First month on Wegovy
Your Wegovy starting dose feels less powerful initially, but patience pays off as you titrate up. Focus on portion control over appetite suppression in the first 1-2 weeks, then expect appetite control to strengthen as the medication builds up.
For practical eating guidance during this period, see our free Mounjaro meal plan (the principles apply equally to Wegovy).
Pharmacist-Led Care at Slinic
Slinic is a GPhC-registered pharmacy with pharmacist-led clinical oversight. Every Mounjaro and Wegovy prescription is verified by a qualified pharmacist before dispensing.
Shadeia Younis
Superintendent Pharmacist, Slinic (GPhC 2052119)
Every Mounjaro and Wegovy prescription dispensed by Slinic is clinically verified and overseen by Shadeia Younis, our superintendent pharmacist. That means before your medication leaves our pharmacy it has been checked by a qualified, registered professional who is accountable for its safety.
This level of oversight is not standard across all online providers. Pharmacist-led dispensing means a real clinical expert reviews your treatment at every stage — which matters especially when switching between medications.
Frequently Asked Questions
Generally no. The weight you’ve lost on Mounjaro typically stays off when you switch to Wegovy, provided you maintain healthy habits during transition. Some patients see small temporary fluctuations during the changeover, but this often reverses once Wegovy reaches therapeutic levels. Your body doesn’t “reset” just because you changed medications.
The complete process typically takes around 10-14 days from decision to first Wegovy injection:
- Days 1-2: Complete online consultation
- Within 24 hours: Clinical review and prescription verification
- Day 3-4: Medication ships
- Days 5-14: 7-day gap after your last Mounjaro injection, then start Wegovy
Contact your pharmacist if side effects become problematic. Most side effects improve within 2-3 weeks as your body adjusts. If they don’t, your prescriber can slow your dose escalation, provide management strategies, or discuss alternative options.
Some patients do find Wegovy suits them less well than Mounjaro. In these cases, you might consider returning to Mounjaro (following another 7-day gap), trying alternative medications, or exploring other weight management approaches.
Yes, you can switch back to Mounjaro after trying Wegovy, following the same 7-day gap safety protocol and clinical review.
Many patients who initially worry about switching find Wegovy works well once they reach therapeutic doses. Giving it at least 8-12 weeks at your target dose before making final decisions is recommended. For more on the opposite direction, see our guide on switching from Wegovy to Mounjaro.
Savings depend on your current Mounjaro dose. Some examples at Slinic pricing:
- Mounjaro 15mg (£285) → Wegovy 2.4mg (£209.99): Saves £75.01 monthly
- Mounjaro 10mg (£255) → Wegovy 1.7mg (£174.99): Saves £80.01 monthly
- Mounjaro 7.5mg (£225) → Wegovy 1mg (£149.99): Saves £75.01 monthly
These savings include everything — no hidden consultation fees, no surprise charges. Your Slinic price is your complete monthly cost.
Yes, the 7-day gap is generally recommended regardless of dose levels. This safety requirement prevents medication overlap, since both Mounjaro and Wegovy have week-long half-lives and remain active in your system for several days. Your prescriber will confirm the appropriate timing for your specific situation.
Most patients start Wegovy at the 0.25mg starter dose regardless of their previous Mounjaro dose. This allows your body to adjust to the new medication and helps reduce the risk of side effects. Some patients may start at a slightly higher dose based on clinical assessment, but starting low remains the safest approach.
From the 0.25mg starter dose, you’ll typically titrate up to 0.5mg at week 5, then 1mg, 1.7mg, and finally 2.4mg as the maintenance dose. The escalation can be paused at any dose if side effects need more time to settle.
In the head-to-head SURMOUNT-5 trial (NEJM 2025), tirzepatide (Mounjaro) achieved 20.2% mean weight loss vs 13.7% for semaglutide (Wegovy) over 72 weeks. Mounjaro shows higher average weight loss in clinical trials.
However, individual responses can vary significantly. Wegovy remains highly effective for sustainable weight management, with the STEP-1 trial showing approximately 15% mean weight loss at the 2.4mg maintenance dose over 68 weeks. Many patients achieve excellent results on either medication.
Yes, but your diabetes management requires extra consideration. Both Mounjaro and Wegovy lower blood sugar, so switching medications might temporarily affect your glucose control and diabetes medication needs.
Important considerations:
- Monitor blood sugar more frequently during the switch
- Your diabetes medications might need adjusting
- Inform your diabetes care team about the switch
- Watch for hypoglycemia symptoms (especially if taking insulin)
Yes. Slinic is registered with the General Pharmaceutical Council (GPhC: 1033729). Superintendent Pharmacist Shadeia Younis (GPhC: 2052119) oversees all treatments. Both registrations are publicly verifiable on the GPhC register at pharmacyregulation.org.
Related Guides and Pages
Mounjaro & Wegovy Treatment Guides
These articles answer the questions most patients have when comparing and switching between weight loss injections.
- Can you switch from Wegovy to Mounjaro safely? – The opposite direction: how to switch from Wegovy to Mounjaro.
- Cheap weight loss injections UK – Safe, affordable options for Mounjaro and Wegovy.
- Mounjaro dosing schedule explained – How the titration works from 2.5mg through to 15mg.
- How long does Mounjaro take to work? – Realistic timelines for weight loss results.
- Managing Mounjaro side effects – Practical strategies for nausea, constipation, and fatigue.
- Free Mounjaro meal plan UK – 14-day plan with shopping lists.
- The complete Mounjaro cost breakdown 2026 – Monthly pricing at every dose.
- Best Mounjaro provider UK 2026 – Honest comparison of UK Mounjaro providers.
Key Slinic Pages
- Mounjaro treatment page – Full overview of Mounjaro at Slinic.
- Wegovy treatment page – Full overview of Wegovy (semaglutide) at Slinic.
- Weight loss treatments – Slinic’s full range of weight loss options.
- How it works – The full consultation and dispensing process explained.
- About Slinic – Who we are, our GPhC registration, and our pharmacist-led model.
- Complete our online consultation – Start your treatment.
Medical References and Guidance
Clinical guidance in this article is based on the Mounjaro (tirzepatide) and Wegovy (semaglutide) Summary of Product Characteristics (SPC) as approved by the MHRA for use in the UK. Trial data is from the SURMOUNT-1 trial (NEJM 2022), STEP-1 trial (NEJM 2021), and SURMOUNT-5 head-to-head trial (NEJM 2025). NICE Technology Appraisal TA1026 covers tirzepatide for weight management in adults (published December 2024). All medical facts in Slinic content are verified against MHRA, NICE, NHS, and BNF sources.
Thinking About Switching to Wegovy?
Switching from Mounjaro to Wegovy isn’t about starting over — it’s about finding the right fit for your body, budget, and goals. Complete our online consultation and a pharmacist will review your information within 24 hours.
Complete Our Online ConsultationMedical Disclaimer
This article provides educational guidance about switching between weight loss medications and is not a substitute for professional medical advice. Both Mounjaro and Wegovy are prescription-only medicines and should only be used together with a reduced-calorie diet and increased physical activity under appropriate clinical supervision. Always consult qualified healthcare providers before starting or switching weight loss medication. Individual results vary. Prices correct as of April 2026 and may be subject to change.
Related Blog Posts From Slinic
Mounjaro and Wegovy Together: Clinical Safety and Switching Protocols – clinical safety and switching protocols for Mounjaro and Wegovy.
Wegovy 7.2mg Guide: Mastering the Maintenance Phase – mastering the Wegovy 7.2mg maintenance phase of medical weight loss.
Best Time of Day to Take Wegovy: A Specialist Clinical Guide – a specialist clinical guide to the best time of day to take Wegovy.