Switching From Mounjaro to Wegovy: Everything You Need to Know About the Transition

People consider switching from Mounjaro to Wegovy for various reasons. Some are thinking about price, while others may want to change because they're not responding well to Mounjaro. So can you switch between the two medications?

Yes, taking Wegovy after stopping Mounjaro is possible. However, the medicines contain different active ingredients and work in slightly different ways. They also have distinct dosing schedules. This means you can't directly convert your current Mounjaro dose into an equivalent Wegovy dose.

A qualified prescriber can review your weight loss journey results so far and help you make the transition safely. This blog explains the process of switching from Mounjaro to Wegovy and how Curely can help.

Can You Switch From Mounjaro to Wegovy?

Yes, you can make the change under the guidance of a clinician. This is because being eligible for Mounjaro doesn't automatically mean you're eligible for Wegovy. While both are weight loss injections, they have different active ingredients. Their doses are also different. Switching without proper guidance can lead to adverse side effects.

The following table shows key differences between Mounjaro and Wegovy and how they can affect the transition:

Risks of Switching Without Guidance

Wegovy switching without medical supervision could lead to the following effects:

• Toxic Accumulation: Both medications have long half-lives, meaning they stay in your body for some time. If you inject Wegovy too soon after stopping Mounjaro, the overlapping active ingredients can increase severe side effects such as continuous vomiting, which can lead to dehydration.
• Acute Pancreatitis: Your pancreas is highly sensitive to the gut hormones these medications mimic. When you switch to Wegovy without guidance, the concentration of tirzepatide and semaglutide can overstimulate the pancreas, leading to abdominal pain and fever.
• Possible Loss of Glycemic (Blood Sugar) Control: Because Mounjaro acts on two receptors, it can be more powerful. Wegovy may not manage your blood sugar at the same level because it's a single agonist. Switching without help can lead to spikes in your blood sugar levels.
• Possible Weight Regain: When you switch to a dose of Wegovy that's too low, or your body doesn't adjust to it well, your cravings and hunger could return. This could cause overeating and weight regain.

The loss of the GIP receptor agonist in Mounjaro means your body may respond differently to Wegovy. Only a lisenced clinical service like Curely can balance the doses and help you make a safe transition that prevents weight regain and severe stomach problems.

Top Reasons for Transitioning from Mounjaro to Wegovy

There are many reasons why you could switch between the weight loss treatments, including:

Side Effects

Common side effects of Mounjaro include nausea, diarrhoea, vomiting and constipation. Wegovy can cause similar symptoms, so switching won’t necessarily cause them to stop. However, people don’t always respond to medicines in the same way. Your body may handle the semaglutide differently from tirzepatide.

People who have severe side effects from Mounjaro can try switching to Wegovy to see if their bodies respond with less intense symptoms. Note that mild side effects are normal. But if you're not sure, speak to Curely. We can assess your symptoms and review your current dose, then make adjustments accordingly.

Cost or Availability

Currently, Wegovy is cheaper at £89- £120 per month, while Mounjaro costs £ 140- £ 260+ per month. Eli Lilly, the company that makes Mounjaro, increased UK prices for the injection to match the rest of Europe.

Some people may want to switch to Wegovy for maintenance doses to decrease costs. However, note that price shouldn't be the only factor to consider when picking a weight loss medication. Your health should come first.

It's also worth noting that availability can warrant switching weight loss injections. According to an article by the World Health Organization (WHO), there is a global shortage of GLP-1 medications that's causing the manufacture of counterfeit and falsified versions.

The Medicines and Healthcare products Regulatory Agency (MHRA) advises against buying GLP-1 medications from illegal and unregulated sources.

When your specific Mounjaro dose is out of stock at legitimate UK pharmacies, switching to Wegovy may be the only way to avoid reversing your weight loss results. If this happens, reach out to Curely. We'll help you get back on track with new medication or dose adjustments.

Treatment Response

You can request a dose review or a medication change if you're no longer losing weight or if the medication no longer controls your appetite as usual.

Note that it's normal not to lose weight during the first few weeks of taking Mounjaro. The starting dose is supposed to help your body adjust. However, there are other signs that it's working. Symptoms such as loss of appetite and food cravings show Mounjaro is working as intended even if the scale doesn't move.

However, if you go a while without losing weight and feel your cravings return, discuss it with your provider to switch or make a dose adjustment.

Cardiovascular Benefits

Wegovy is the first weight loss medication to be approved for preventing life-threatening cardiovascular events such as heart attacks and strokes in eligible adults at risk. A clinician may suggest switching to Wegovy if your heart health is the priority.

What Changes When You Switch from Mounjaro to Wegovy?

While Mounjaro and Wegovy are both prescription weekly injections, your body can react differently when you make the switch. The following may happen:

Appetite

It's normal to feel your appetite return temporarily. You may also get food cravings. This usually happens during the first 14 to 21 days of the switch because your body is adjusting to the new medication. It can also happen if the clinician starts you on a lower dose. Note that this should only last a few weeks. Your appetite suppression and food cravings should stabilize after some time on Wegovy.

Side Effects

Both medicines can cause nausea, vomiting, diarrhoea, constipation and abdominal discomfort. These effects are often more noticeable when starting treatment. It may also happen when moving to a higher dose.

Some people experience symptoms after starting Wegovy. It can happen even if you tolerated Mounjaro well. This is normal because you're still adjusting to the medication, and the symptoms should clear over time. Speak to a clinician if your side effects on Wegovy are persistent and intense or refer to the Patient Information Leaflet.

Effectiveness

STEP UP clinical trials show that patients lost an average of 19% body weight on Wegovy 7.2mg. However, these results can vary from person the person.

After switching to Wegovy, you may lose more or less weight than average depending on factors such as your starting body weight, treatment duration, dose, and side effects. Eating a healthy diet and exercising can also affect results.

Curely will always check your weight loss progress with each dose. We focus on your response to Wegovy treatment and review your average weight loss results to make sure the medication is working as intended.

How Clinicians Switch You From Mounjaro to Wegovy

There is no universal Mounjaro-to-Wegovy dose conversion chart approved by the MHRA or The National Institute for Health and Care Excellence (NICE).

Your prescriber should decide the interval between treatments and the most appropriate dose after reviewing your current Mounjaro dosage and treatment plan. Stopping Mounjaro and starting Wegovy usually goes as follows:

Step 1: Stop Mounjaro Dosing

Tell your healthcare provider the date and strength of your last Mounjaro injection. Follow the treatment dates they give you. Avoid taking a final dose unless your clinician advises you to.

Step 2: Complete a Clinical Review

Your clinical team will usually need to know details such as:

• Your current and previous Mounjaro doses
• The date of your last shot
• How long you’ve used Mounjaro
• Any side effects you’ve experienced
• Your current weight and recent progress
• Other prescription and non-prescription medication you're taking
• Relevant changes to your physical or mental health
• Why you want to change treatment

Answer the consultation questions accurately, as omitting any other medications or health conditions could affect which Wegovy dose is safe for you.

Step 3: Follow the Prescribed Interval

Your prescriber will tell you how much time to allow between your final Mounjaro dose and first injection for Wegovy. This break is called the washout period. It varies according to the person but is usually a minimum of seven days and may depend on factors such as:

• Your current Mounjaro dose
• When you took it
• Whether you still have side effects
• How severe those symptoms are
• Other medicines and health conditions
• How long you've gone without a dose of weight-loss medication

Avoid shortening the break even if your appetite returns. Taking the medicines too close together could be like taking a double dose, which can increase the risk of side effects.

Step 4: Take Your First Wegovy Dose

Taking a higher Mounjaro dose doesn't mean you'll take a higher Wegovy amount after switching. Avoid matching the amounts by milligram.

A prescriber will determine which Wegovy dose you can start with. The injection usually starts at 0.25mg once a week. However, you may start at a higher dose depending on your health and response to the medication. Only take the dose that your doctor prescribes.

Step 5: Report Symptoms

Always monitor your symptoms during the first few weeks after switching to Wegovy. Tell your prescriber about:

• Nausea & vomiting
• Bowel changes
• Hunger and fullness
• Your ability to eat regular meals
• Your weekly weight loss
• New or worsening symptoms

This information can help your healthcare provider decide whether you should remain on the current dose.

Curely Helps You Switch Safely

Curely's prescribing team will guide you through every step of switching to Wegovy if you're on Mounjaro. We provide safe, UK-licensed weight management methods.

After you complete a quick online consultation, we'll review your medical history, current and previous medications, weight-loss progress, and treatment goals to determine whether switching is ideal for you.

Curely will recommend the right starting dose and explain when to begin your new treatment. You'll have access to expert clinical support if you have questions about side effects or your progress.

Curely makes it simple to switch safely. There are no in-person GP appointments or pharmacy visits to slow you down. Start your consultation today.

Frequently Asked Questions

Can I Take Mounjaro and Wegovy at the Same Time?

No, you should avoid taking both injections at the same time. Taking Wegovy and Mounjaro simultaneously could lead to an overdose and severe digestive complications such as persistent vomiting and intense pain. Only take your prescribed dose of Mounjaro or Wegovy.

What Wegovy Dose Will I Start on After Mounjaro?

There's no universal starting dose when switching because the two medications are different. It depends on what your clinician advises after evaluating your last Mounjaro dose strength and how long you have been on it. It can also depend on your history of side effects. Speak to Curely, and we'll complete an assessment for safe dose switching.

Will Wegovy Work After Mounjaro?

Wegovy can help with weight loss after switching from Mounjaro. However, how much you lose depends on your individual response and factors such as lifestyle changes and diet. It's normal not to lose weight immediately after switching. Give your body time to adjust.

Can I Switch Back to Mounjaro Later?

Yes, you can. However, because switching affects your body, you must do it under the guidance of your prescriber. Curely can help you safely transition back to Mounjaro if you're on Wegovy, after completing a thorough online consultation.

Will I Get Withdrawal Symptoms When Switching to Wegovy?

Stopping Mounjaro and starting Wegovy don't cause withdrawal symptoms. However, you may notice increased hunger or reduced feelings of fullness as effects of Mounjaro wear off. When you start Wegovy, appetite suppression and other effects will return after some time. Speak to Curely if you're concerned about switching to Wegovy.

Conclusion

Switching from Mounjaro to Wegovy may be a good option if your current treatment no longer meets your needs or is unavailable. However, you can only make the change safely under clinical guidance.

Your healthcare provider must consider your current Mounjaro dose, last injection, side effects, medical history, and other medications to help you transition. They’ll then tell you when to start Wegovy and which dose to use.

Give your body time to adjust to the new medication and follow the prescribed dosing schedule. Also, always report severe symptoms. Complete Curely’s online weight loss consultation today, and we'll help you find the best treatment.

Reference List

• England N. NHS England » Over a million people could be offered Wegovy to cut heart attack and stroke risk on the NHS. England.nhs.uk. Published April 2026.
• Sheppard S. Shortages impacting access to glucagon-like peptide 1 receptor agonist products; increasing the potential for falsified versions. www.who.int. Published January 29, 2024.
• Results With the Pen. Wegovy.com. Published 2026. Accessed July 13, 2026.
• Wharton S, Freitas P, Jøran Hjelmesæth, et al. Once-weekly semaglutide 7·2 mg in adults with obesity (STEP UP): a randomised, controlled, phase 3b trial. The Lancet Diabetes & Endocrinology. Published online September 1, 2025.