What to Expect and When: The Typical Timeline
Because Wegovy is a once-weekly injectable GLP-1 receptor agonist, side effects tend to follow a fairly recognisable pattern linked to the injection schedule. Understanding that pattern can make the early weeks feel a lot less uncertain.
The first 24–72 hours after a dose
For many people, any side effects are most noticeable in the first one to three days after each injection. Nausea is the most commonly reported symptom during this window, often accompanied by a reduced appetite, burping, or feelings of fullness that arrive quickly when eating. Some people also report fatigue or mild headache during this period.
After a dose increase
Wegovy is typically started at a lower dose and adjusted upward by a prescriber over time. Side effects often re-emerge — or feel more pronounced — each time the dose is stepped up, before settling again as the body acclimatises. This is also a common pattern seen with Mounjaro (tirzepatide); you can read more about when Mounjaro side effects typically begin if you are switching or comparing experiences.
Over the longer term
For many people, gastrointestinal side effects gradually ease over several weeks at a stable dose, though this varies considerably from person to person. Some people experience very little, while others find certain symptoms persist for longer. A broader overview of commonly reported Wegovy side effects covers what tends to come and go over the course of treatment.
According to information published on the electronic Medicines Compendium (eMC), gastrointestinal reactions are among the most commonly reported adverse effects associated with semaglutide, and are most frequent during the dose-escalation phase.
If you are also curious about the timing of side effects on tirzepatide, our page on how long after taking Mounjaro nausea tends to arrive explores this in detail. For a wider look at side effects across both medicines, the full guide to GLP-1 side effects is a useful reference.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Tracking Side Effect Timing with GLP Trackr
One of the most useful things you can do when side effects appear is log them as they happen — not because the app replaces clinical advice, but because a clear record of when symptoms started, how intense they were, and how long they lasted is genuinely valuable to bring to your prescriber or doctor.
GLP Trackr's side-effect tracker lets you log symptoms at the moment you notice them, giving you a timeline that maps directly onto your injection schedule. Over time, you can see whether nausea consistently peaks at a certain point in your weekly cycle, whether it is easing dose by dose, or whether there is a pattern worth discussing at your next appointment. The app can also generate a doctor report — a summary of your logged data that you can share with your healthcare professional, so the conversation is grounded in your actual experience rather than memory.
If you want to keep tabs on how symptoms evolve alongside other factors — sleep, energy, food intake — the daily check-in captures the full picture in about 30 seconds each morning.
GLP Trackr is available free on the App Store and Google Play. Start a 7-day free trial and begin building a side-effect log from your very next dose.
A note on safety: if any symptom feels severe, is getting worse rather than better, or is worrying you in any way, contact your healthcare professional promptly. GLP Trackr helps you record what you are experiencing so you can discuss it with them — it is not a substitute for their advice. Any concerns about your dose or treatment should always go to your prescriber, not the app. Side effects such as severe or persistent abdominal pain should be assessed by a healthcare professional without delay. Any side effects worth reporting can also be submitted to your national reporting scheme (such as the UK's Yellow Card scheme) in addition to telling your prescriber.
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Morning Check-In
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.
Injection Tracking
Log every dose with a single tap. Track your dose history, phase in your cycle, estimated medication levels, and upcoming injection dates — with reminders so you never miss a scheduled shot.
Hydration Reminders
Staying hydrated is especially important on GLP-1 medications. Set daily water targets, log intake throughout the day, and receive smart nudges when you're falling behind your goal.
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Recipe Library
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Beautiful, easy-to-read charts show your weight loss trajectory, weekly nutrition trends, medication responses, and wellbeing scores over time — turning raw data into genuine insights.
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Snap a photo of any meal and get a full nutrition breakdown in seconds — calories, protein, carbs, fat, and fibre. No searching. No manual logging. Just point, snap, and track.
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Log walks, workouts, and movement with activity targets that flex with your energy levels. On lower-energy dose days, gentler targets keep you moving without burning out.
Community Support
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Frequently asked questions.
For many people, side effects from Wegovy begin within the first one to three days after an injection. Nausea and digestive symptoms are most common during this window, particularly after a new or increased dose, and often ease as the body adjusts.
Side effects from Mounjaro (tirzepatide) are commonly reported within the first 24 to 72 hours after an injection, following a similar pattern to Wegovy. Symptoms are often most noticeable after a dose increase and tend to settle over time at a stable dose.
Yes, many people experience a temporary return or increase of side effects — particularly nausea — each time their dose is stepped up. This is commonly reported with both Wegovy and Mounjaro, and usually settles within a couple of weeks at the new dose level.
Contact your prescriber or doctor promptly if any symptom is severe, persistent, or getting worse rather than better. Severe or worsening abdominal pain in particular should always be assessed by a healthcare professional without delay. Never rely on an app to manage serious symptoms.
Logging symptoms as they occur — noting timing relative to your injection, intensity, and duration — gives you a useful record to discuss with your prescriber. GLP Trackr's side-effect tracker and daily check-in make this straightforward to do from your phone.