Why the Two Medicines Can Produce Different Results
Both medicines act on GLP-1 receptors, which are involved in appetite regulation and the sense of fullness. The key difference is that Mounjaro also activates GIP receptors — making it a dual agonist — while Wegovy targets GLP-1 alone. In practice, this means the two medicines can affect appetite, digestion, and how the body responds to food in subtly different ways.
What "not working" can mean
Before concluding a medicine isn't working, it's worth considering what that means. Common reasons people feel a medicine isn't effective include:
- Not yet being at a therapeutic dose — both medicines are typically started low and adjusted over time by a prescriber, and the full effect may not be felt until a higher dose is reached
- Expecting results faster than is realistic — progress on either medicine is rarely linear and varies considerably between individuals
- Side effects that make it difficult to stay consistent
- Lifestyle factors such as protein intake, sleep, and activity levels, which interact with how well appetite changes translate into progress
If you feel Wegovy isn't working — or wonder whether it will after a difficult experience with Mounjaro — the most useful first step is a detailed conversation with your prescriber. They can review your dose history, how long you've been on treatment, and whether a switch or adjustment makes clinical sense for you.
For a closer look at how each medicine works individually, see how Wegovy works and explore whether Mounjaro is actually working for a broader view of what to expect.
How long does Wegovy take to work?
Many people notice some appetite change within the first few weeks, but meaningful progress in weight typically becomes more apparent after several months, particularly once a prescriber-directed dose increase has been in place for a while. Individual responses vary widely, and comparing your timeline to someone else's is rarely helpful. Your prescriber is the right person to assess whether your response is on track.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Tracking Your Journey Closely — Whichever Medicine You're On
One of the most useful things you can do when questioning whether a medicine is working is to build a clear, detailed picture of your own data — because "it doesn't feel like it's working" is much harder to act on than a log showing dose history, weight trends, side-effect patterns, and daily food intake over several weeks.
GLP Trackr's insights and analytics feature is particularly relevant here. Rather than relying on memory or gut feeling, the app surfaces correlations between your habits and your results — for example, how your protein intake, sleep quality, or consistency with doses relates to your weight trend over time. That kind of picture is genuinely useful to bring to a prescriber appointment when discussing whether to adjust, continue, or reconsider your treatment.
Alongside insights, logging each dose and its date means you can clearly show your prescriber how consistent your schedule has been — which matters when evaluating whether a medicine has had a fair trial. The weight and progress charts give a week-by-week view that puts any plateau or slow period in honest context.
GLP Trackr works with both Mounjaro and Wegovy, so whether you're mid-journey on one or considering what comes next, your tracking history travels with you. For a broader understanding of how these medicines work and what shapes your response, the guide to how Mounjaro works covers the mechanism in detail, and how quickly results typically appear gives useful context on timelines.
If you have concerns about your response to either medicine — or about switching — always raise them with your prescriber or doctor. They have your full clinical history and are the only person qualified to advise on whether a change is appropriate. GLP Trackr helps you record and organise the information that makes that conversation more informed; it isn't a substitute for their guidance.
Start building that detailed picture today — download GLP Trackr free on the App Store or Google Play and try it free for 7 days, no commitment needed.
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Start every day with a 60-second wellness check-in. Log how you're feeling, track nausea, appetite, energy, and mood — giving you and your care team a complete picture of how your medication is working.
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Frequently asked questions.
There is no guaranteed answer — individual responses to tirzepatide and semaglutide vary, and only your prescriber can assess whether switching is appropriate for you. The two medicines act through related but distinct mechanisms, so some people do respond differently to each.
Common reasons include still being on a low starting dose, not yet enough time at a therapeutic dose, or lifestyle factors affecting results. If Wegovy doesn't feel effective, speak with your prescriber — they can review your dose history and overall response before drawing conclusions.
Some appetite changes may be noticed within the first few weeks, but meaningful weight progress often becomes clearer after several months at a prescriber-directed dose. Individual timelines vary considerably, and your prescriber is best placed to assess whether your response is on track.
Some people report improvements in energy as their weight changes on a GLP-1 medicine, but this isn't universal and isn't a guaranteed effect. If changes in energy or mood are a concern, discuss them with your prescriber or doctor, as they can have multiple causes.
Logging your doses, weight, food intake, and how you feel over time creates a clear record to discuss with your prescriber. It replaces vague impressions with concrete data, helping both of you assess whether the medicine has had a fair trial and what might need to change.