Side effects on Ozempic, Wegovy, and Mounjaro are real — but they're not random. They follow predictable patterns tied to your injection cycle, what you eat, and how you sleep. Tracking them turns guesswork into insight.
Not medical advice · Built for GLP-1 users · No wearable needed
Most GLP-1 users report side effects verbally to their prescriber: "I've been nauseous." But without data — severity, timing, triggers — your prescriber has nothing actionable to work with. A daily log changes that.
Weekly GLP-1 injections create predictable cycles — nausea and fatigue peak 24–72 hours post-injection, then ease. You only see this pattern if you're logging daily.
High-fat meals, large portions, and alcohol reliably worsen GLP-1 nausea. But your personal triggers are unique. Tracking meals alongside symptoms reveals yours in 2–3 cycles.
"Nausea 7/10 on injection days 1–2, improving to 2/10 by day 5, consistent for 6 weeks" gives your doctor something to act on. Anecdotes don't.
Most side effects improve substantially by weeks 8–12. Tracking week-over-week shows the trend — which is motivating when you're in the difficult early weeks.
Rate each one 0–5 (0 = none, 5 = severe). Takes under 60 seconds. After 2–3 weeks, you'll see patterns that change how you manage your treatment.
The most reported GLP-1 side effect. Log severity 0–5 each morning. Note whether you had a large meal, fatty food, or alcohol the night before. Peak is usually injection days 2–4. See full nausea tracking guide →
Fatigue on GLP-1 can come from the medication itself, from under-eating (especially insufficient calories or protein), or from poor sleep. Logging fatigue alongside nutrition and sleep separates these causes within weeks.
Emotional blunting, reduced motivation, anxiety, or irritability are all reported by GLP-1 users. These are tied to dopamine receptor interactions. Without a daily mood score, you can't tell if you're adapting or worsening. See GLP-1 mood tracker →
GLP-1 medications significantly slow gastric motility, making constipation common. Log bowel regularity and any cramping or discomfort as a simple 0–3 severity. Fibre intake, hydration, and movement all affect this — and tracking shows which.
Headaches in the first weeks are often dehydration-related rather than medication-specific. GLP-1 users eat less and therefore consume less water from food. Tracking headaches alongside water intake usually reveals the connection within 1–2 weeks.
Hair thinning (telogen effluvium) is caused by rapid weight loss, not the medication itself. It typically peaks 8–16 weeks in and resolves as weight stabilises. Log hair shedding and protein intake together — inadequate protein significantly worsens it.
Redness, swelling, or itching at the injection site. Note the site used (abdomen, thigh, upper arm) and whether the area was rotated. Site rotation reduces reactions significantly — tracking shows whether a specific site is worse for you.
Dizziness is often tied to low blood pressure (especially after dose increases) or to low blood sugar from eating too little. Log alongside meal timing, water intake, and blood pressure if you have a monitor. Patterns usually become clear within 2 weeks.
tr8ck's medication module logs your injection date, dose, and side effects. tr8ck then correlates these automatically with your meal logs, sleep scores, water intake, and mood — surfacing the patterns that matter.
No wearable · No credit card · 15 seconds a day
Nausea, fatigue, GI symptoms (constipation/diarrhoea), headaches, mood changes, hair thinning, injection site reactions, and dizziness. Nausea is the most common. Log each as a 0–5 severity score daily — it takes under a minute.
For weekly injections, side effects typically peak 24–72 hours post-injection when blood concentration is highest. By days 5–7 most users feel significantly better. This cycle improves with adaptation — most users see substantial relief by weeks 8–12.
The only reliable way is to track daily. If symptoms consistently peak on injection days and ease by day 5–7, it's the medication cycle. If symptoms are random with no weekly pattern, look at sleep, nutrition, or stress first.
Usually yes. Hair thinning is caused by rapid weight loss (telogen effluvium), not the medication chemistry. It typically resolves within 3–6 months. Adequate protein intake significantly reduces severity — tr8ck helps you track both.