Mounjaro and Wegovy are both once-weekly prescription medicines used to support weight management, but changing treatment may be appropriate if your treatment needs change over time. As they contain different active ingredients, switching involves a personalised dosing approach rather than an equivalent dose replacement.
Understanding the correct switching from Mounjaro to Wegovy dosage is important for a safe and effective transition. This guide explains how the switch is usually managed in the UK and what you can expect throughout the process.
GLP-1 / GIP
Mounjaro
Dual-agonist support that helps curb appetite, hunger, and cravings to drive substantial, sustained weight loss.
- ✔~22.5% average body weight loss
- ✔Significant weight reduction
- ✔Improves blood sugar levels
- ✔Clinically proven weight loss
Key Takeaways: Eating Enough While Taking Mounjaro
- ✔Switching from Mounjaro to Wegovy requires a personalised treatment plan, as there is no direct dose conversion between the two medicines.
- ✔A 7-day gap is usually recommended between your final Mounjaro injection and your first Wegovy dose, with the starting dose determined by your clinician.
- ✔During the first few weeks, you may notice temporary changes in appetite, digestion or weight while your body adjusts to Wegovy and dose escalation.
- ✔During the first few weeks, you may notice temporary changes in appetite, digestion or weight while your body adjusts to Wegovy and dose escalation.
Can You Switch From Mounjaro to Wegovy?
Yes, many people can switch from Mounjaro to Wegovy following a clinical assessment. Before recommending the change, your prescriber will review your medical history, current treatment and whether Wegovy is a suitable option for your ongoing weight management.
In most cases, Wegovy is started around seven days after the final Mounjaro injection to allow one treatment to clear before the next begins. Your starting dose will be determined by your clinician rather than matched to your previous Mounjaro strength.
When Might a Healthcare Professional Recommend Switching?
Changing from Mounjaro to Wegovy may be appropriate in certain circumstances. The decision is based on your response to treatment, overall health and long-term weight management needs rather than a single factor.
Difficulty Managing Side Effects
Mild digestive side effects are common when starting or increasing the dose of GLP-1 medicines, but persistent nausea, vomiting, diarrhoea or other gastrointestinal symptoms may require a treatment review. If these symptoms continue despite appropriate dose adjustments and supportive measures, your clinician may recommend switching to Wegovy if it is considered a better-tolerated option.
Cost and Long-Term Affordability
Treatment cost can influence long-term weight management decisions, particularly when ongoing therapy is required. At Online Weight Loss Clinic, Wegovy is generally priced lower than Mounjaro across comparable treatment stages. However, affordability should be considered alongside clinical suitability and treatment effectiveness rather than as the sole reason for switching.
| Mounjaro | Price | Wegovy | Price |
|---|---|---|---|
| 2.5 mg | £139 | 0.25 mg | £88 |
| 5 mg | £179 | 0.5 mg | £98 |
| 7.5 mg | £230 | 1 mg | £109 |
| 10 mg | £239 | 1.7 mg | £164 |
| 12.5 mg | £265 | 2.4 mg | £198 |
| 15 mg | £279 | 7.2 mg | £279 |
Different Long-Term Treatment Goals
Your treatment plan may change as your health needs evolve over time. Wegovy may be recommended if it better aligns with your medical history, cardiovascular risk profile or long-term weight management goals. Your healthcare professional will consider your overall health, treatment priorities and expected benefits before deciding whether switching is the most appropriate option for you.
Individual Response to Treatment Results
Mounjaro may not produce the same results for everyone. If your weight loss has plateaued despite following your treatment plan, your clinician may consider whether Wegovy is a more suitable option. Clinical studies have reported average weight loss of around 21% with higher-dose Wegovy compared with 22.5% for the highest dose of Mounjaro over 72 weeks, although individual results depend on factors such as adherence, lifestyle and overall health.
How to Switch From Mounjaro to Wegovy Safely
Once you and your healthcare professional have decided to change treatment, following the correct switching process is essential. Knowing when to stop Mounjaro, when to start Wegovy and how the dose is adjusted can help make the transition as smooth as possible.
Step 1: Complete a Clinical Assessment
Before changing treatment, your healthcare provider will review your medical history, current Mounjaro dose, weight loss progress and any side effects you have experienced. This assessment helps determine whether Wegovy is an appropriate option and identifies the most suitable starting dose.
Step 2: Take Your Final Mounjaro Dose
Continue taking Mounjaro as prescribed until your agreed stopping point. Unless your healthcare professional advises otherwise, take your final injection on your usual treatment day before preparing to begin the transition.
Step 3: Observe the Recommended Waiting Period
In most cases, a 7-day interval is recommended between your final Mounjaro injection and your first Wegovy dose. This allows one treatment cycle to finish before the next begins and reduces the likelihood of overlapping gastrointestinal side effects.
Step 4: Start Wegovy at the Recommended Dose
Rather than matching your previous Mounjaro strength, your clinician will recommend a Wegovy starting dose based on your previous treatment response, tolerability and individual circumstances. This personalised approach helps your body adjust safely to the new medicine while reducing the likelihood of gastrointestinal side effects during treatment.
Step 5: Increase the Dose Gradually
Wegovy is introduced using a gradual dose-escalation schedule to help your body adjust to treatment. If you tolerate each dose well, your healthcare professional will advise when to increase to the next strength until you reach your maintenance dose.
Step 6: Continue Monitoring Your Progress
During the first few weeks after switching, your healthcare provider may review your weight loss progress, side effects and overall response to treatment. These follow-up assessments help determine whether your current dose remains appropriate or if any adjustments are needed.
Store Wegovy Correctly
Store your Wegovy pen in a refrigerator at 2°C to 8°C before first use and avoid placing it near the freezer compartment where temperatures may fluctuate. Once in use, follow the storage instructions supplied with your medicine and always keep the pen out of reach of children.
Can You Start Wegovy at a Higher Dose After Mounjaro?
Yes, some people may start Wegovy at a higher dose when switching from Mounjaro. Your healthcare professional will recommend a suitable Wegovy starting dose after reviewing your current Mounjaro dose, previous treatment response and overall health.
| Current Mounjaro Dose | Possible Wegovy Starting Dose* |
|---|---|
| 2.5 mg | 0.25 mg |
| 5 mg | 0.5 mg |
| 7.5 mg | 0.5 mg |
| 10 mg | 1 mg |
| 12.5 mg | 1 mg |
| 15 mg | 1 mg |
Important: This table is a general guide only. It is not an approved dose-conversion chart, and your healthcare professional will determine the most appropriate Wegovy starting dose based on your individual clinical needs.
What to Expect During the First Few Weeks After Switching
Most people transition from Mounjaro to Wegovy without significant problems when following their prescribed treatment plan. However, because Wegovy is often started at a lower dose than your previous Mounjaro treatment, it is normal to notice temporary changes as your body adjusts. These effects are usually mild and improve as treatment continues.
Week 1: The Initial Transition
During the first week, some people notice their appetite increases slightly, particularly during the seven-day gap before starting Wegovy or after beginning a lower dose. Mild digestive symptoms, including nausea or digestive issues, bloating, constipation or diarrhoea, may also occur, although many people experience few or no side effects.
Weeks 2–4: Adjusting to Wegovy
As your body adapts, appetite control usually begins to improve and any digestive symptoms often become less noticeable. Weight loss may continue steadily, although some people experience temporary fluctuations while adjusting to the new medicine. Energy levels also tend to stabilise as treatment progresses.
After Dose Escalation
Each increase in your Wegovy dose may temporarily trigger symptoms such as nausea, headache, stomach discomfort or tiredness, similar to when you first started treatment. These effects are generally short-lived and often improve within a few days as your body becomes accustomed to the higher dose.
When Should You Seek Medical Advice?
Seek medical advice if side effects are severe, persist beyond the first few weeks, or prevent you from eating or drinking normally. You should also contact your healthcare professional if you experience persistent vomiting, severe abdominal pain, signs of dehydration, or if your weight loss does not progress despite following your prescribed treatment plan.
If you're considering switching from Mounjaro to Wegovy, the clinicians at Online Weight Loss Clinic can provide a personalised assessment, answer your questions and support you throughout your treatment journey.
Conclusion: Making the Switch to Wegovy
Changing treatment is a personalised decision that should reflect your health needs, treatment experience and long-term weight management goals. While switching from Mounjaro to Wegovy dosage is not the same for everyone, understanding the process can help you make informed decisions and approach the transition with greater confidence.
If you're considering a switch, speak with a qualified healthcare professional before making any changes to your treatment. A personalised plan, regular follow-up and realistic expectations can help ensure your new treatment continues to support your weight management journey effectively.
GLP-1
Wegovy
A weekly GLP-1 treatment proven to reduce hunger and support meaningful, long-term fat loss.
- ✔~16.9% average body weight loss
- ✔Boosts metabolic & cardiovascular health
- ✔Proven, long-established safety profile
- ✔Weekly injection, easy to use
GLP-1 / GIP
Mounjaro
Dual-agonist support that helps curb appetite, hunger, and cravings to drive substantial, sustained weight loss.
- ✔~22.5% average body weight loss
- ✔Significant weight reduction
- ✔Improves blood sugar levels
- ✔Clinically proven weight loss
FAQs About Switching From Mounjaro to Wegovy
Is there a Wegovy to Mounjaro conversion chart?
No. There is no approved Wegovy to Mounjaro conversion chart because the medicines contain different active ingredients and dosing schedules. Any switch should be planned by a healthcare professional based on your treatment response, tolerability and individual clinical needs.
What is the Mounjaro equivalent of Wegovy 1.7 mg?
There is no direct 1.7 Wegovy equivalent to Mounjaro. Although healthcare professionals may use your current Wegovy dose to help guide treatment, there is no clinically approved dose that matches 1.7 mg of Wegovy.
What is the Mounjaro equivalent of Wegovy 2.4 mg?
There is no direct 2.4 mg Wegovy equivalent to Mounjaro. The most appropriate Mounjaro starting dose depends on factors such as your previous treatment, tolerability and overall health rather than your Wegovy dose alone.
Can you switch from Wegovy to Mounjaro?
Yes, switching from Wegovy to Mounjaro may be appropriate if your healthcare professional believes another treatment better meets your needs. As with any medication change, the switch should follow a personalised treatment plan rather than a like-for-like dose replacement.
How long does it take to adjust after switching from Mounjaro to Wegovy?
Most people begin adapting to Wegovy within the first few weeks, although the adjustment period varies between individuals. Appetite, digestion and energy levels often improve as your body becomes accustomed to the medicine and the dose is gradually increased.
Has anyone switched from Mounjaro to Wegovy successfully?
Yes. Many people have successfully switched from Mounjaro to Wegovy under medical supervision. Individual experiences vary, but following the recommended dosing schedule and attending regular follow-up appointments can help support a smoother transition.
Can I restart Mounjaro if Wegovy is not suitable?
If Wegovy is not well tolerated or does not provide the expected results, your healthcare professional may discuss alternative treatment options, including restarting Mounjaro where clinically appropriate. Do not change medicines without medical advice.
Is Wegovy as effective as Mounjaro for weight loss?
Both medicines are effective weight management treatments, although clinical studies suggest Mounjaro produces slightly greater average weight loss at the highest doses. Individual results vary, and the most suitable treatment depends on your health, treatment response and long-term goals.
