How to Switch from Wegovy to Mounjaro After Stopping Wegovy

Wegovy obesity injection was

launched in Korea in October 2024.

Now that more than a year has passed, some users have successfully completed their diet plan until reaching their target weight, while others have stopped the medication and seen their weight increase again.

As a result, many people are considering switching to Mounjaro or wondering whether it is possible to switch from Wegovy to Mounjaro. Rather than simply viewing it as switching obesity injections, it is important to judge whether it is a better option for you and then decide whether to make the change.

If you are thinking about switching from Wegovy to Mounjaro today, please pay close attention for a moment.

Reasons for considering a change in obesity treatment The reasons for considering switching from Wegovy, an obesity treatment, to Mounjaro are different for each person.

✔️ A plateau in weight loss

When first starting an obesity treatment, weight loss may occur, but at some point the loss may plateau, or the person may not reach their target weight.

✔️ Differences in individual side effects

Severe nausea, vomiting, or bloating that interferes with daily life

✔️ Expectations for a stronger effect

Because research results show a higher rate of weight loss, there may be a larger reduction in body weight.

✔️ Expectations for improved blood sugar control

Mounjaro was approved as a treatment for type 2 diabetes. Therefore, because it works by regulating insulin secretion and suppressing appetite at the same time, it may be considered in cases of prediabetes, insulin resistance, or high fasting blood sugar.

Differences between Wegovy and Mounjaro Both injection treatments can achieve weight loss and blood sugar control at the same time by suppressing appetite and increasing satiety. Wegovy and Mounjaro are both once-weekly subcutaneous injections, but there are major differences in their active ingredients and how they work in the body.

👉 Wegovy

Wegovy works on only one receptor called GLP-1 (semaglutide). It acts on the brain’s appetite center to suppress appetite and increase satiety.

👉 Mounjaro

Mounjaro is a dual-acting agent in which two hormones, GLP-1 and GIP, work together. It helps regulate appetite and affects energy expenditure. It helps insulin secretion and regulates fat cell metabolism, showing a greater effect on weight loss, and it has been reported to help reduce side effects such as nausea.

If Wegovy acts like an appetite brake, Mounjaro could be said to control both the brake and the accelerator that raises energy expenditure.

Switching from Wegovy to Mounjaro Since Wegovy was released first in Korea, it is only natural that interest in Mounjaro, which came later, would be high.

You may be considering switching to Mounjaro because of news that its weight loss effect is greater.

Because the two drugs have different mechanisms of action, dosage systems, and indications, a gradual transition guided by a medical professional is essential for a safe switch. For a safe switch, the key points are the washout period and dose adjustment.

📌 Washout period before switching

No separate washout period is needed before switching. Wegovy is an injection given at weekly intervals. Although there is no fixed rule, Mounjaro is also injected every 7 days, so you can start Mounjaro at the time when your next injection would normally be due.

📌 How to adjust the dose

Even if you were using a high dose of Wegovy, new stimulation of the GIP hormone may occur, so you should start Mounjaro from the first step. Although it varies from person to person, we recommend starting at a low dose and switching in a way that allows your body to safely adapt to the new medication.

📌 Follow-up after switching

Because the ingredients of the two drugs are different, cross-tolerance is not guaranteed. Careful monitoring is needed to see how effective it is, whether there are concerns about side effects, and whether metabolic indicators such as blood pressure and blood sugar improve.

Precautions after switching For a safe and successful transition, it is important to receive a precise evaluation from medical staff with extensive clinical experience and determine whether a switch is truly necessary.

✔️ Possibility of side effects returning

Even if you did not have side effects with Wegovy, there is no guarantee that you will be fine with Mounjaro. Because the two drugs work differently, symptoms such as nausea, abdominal discomfort, or constipation may occur, so the same caution as when starting for the first time is needed.

✔️ Be careful about muscle loss

Because the weight loss effect is strong, you should also watch for loss of muscle mass. It is good to intentionally combine adequate protein intake with strength training.

Clinical trial results have shown that Mounjaro is more effective than Wegovy for weight loss, but some data show that the difference in effectiveness between the two drugs is not large or is similar. Therefore, it is good to remember that the effects of medication can vary from person to person. So if Wegovy is working well for you, there is no need to switch unnecessarily, and when changing injections, be sure to decide after consulting with a medical professional.

At Bliss Clinic, through Wegovy, Mounjaro, and the DT-7 program, we consider the patient’s health condition, side effects, and lifestyle patterns and provide the most suitable method for each person.