Overview
Weight gain is unlikely when switching GLP-1 medications, such as between Mounjaro® and Wegovy®, but it isn't impossible. Understanding how your body may react during the transition can help you manage your expectations and stay on track with your weight-loss goals.
Use this article when you want to:
Understand potential changes in your weight-loss progress during a GLP-1 medication switch
Find out why your body might react differently to a new GLP-1 medication
Learn how to maintain your weight-loss momentum during the switch
What Should I Expect When Switching GLP-1 Medications?
When you switch between GLP-1 treatments, such as from Mounjaro® to Wegovy® (or vice versa), your body needs time to adapt to a different active ingredient (tirzepatide or semaglutide). During this period, you may notice:
A brief slowdown: some people experience a temporary plateau, where weight loss slows down for a short time while the body adjusts to the new GLP-1 medication.
Continued progress: many patients find they continue to lose weight steadily on their new GLP-1 medication, without any interruption.
Increased momentum: in some cases, progress actually picks up again a few weeks after switching, as the new GLP-1 medication begins to take full effect.
How Do I Maintain My Progress During a GLP-1 Medication Switch?
The best way to keep your weight-loss journey moving in the right direction during a switch is to remain consistent:
Follow your schedule: stick closely to your new GLP-1 medication's weekly injection schedule, to help keep medication levels in your system stable.
Focus on your habits: continue to prioritise a balanced diet and regular physical activity — these provide the foundation for your GLP-1 medication to work effectively.
Be patient: give your body at least a few weeks to settle into your new GLP-1 medication before evaluating its effectiveness.