Vomiting while using a GLP-1 is worth recording carefully, even if it happens only once. GLP-1 medicines can cause gastrointestinal side effects, but a log cannot prove why you were sick. Its job is to give your prescriber a clear account of what happened.
For each episode, write the date, approximate time, and how many times you vomited. Add where you were in your treatment week, such as the day of injection or how many days after it, without using that timing as proof of cause. If your dose, product, or schedule recently changed, record the date of that change.
The most useful notes are practical: whether you could keep fluids down, whether you missed food or other medicines, and whether vomiting interrupted sleep, work, travel, childcare, or usual activities. Use simple wording such as "vomited twice after dinner; could sip fluids later" rather than trying to classify the episode.
Add related symptoms separately. Nausea, diarrhoea, constipation, abdominal pain, dizziness, fever, or a general unwell feeling can all matter to the conversation. Do not rank the symptoms or decide from the log whether the medicine should be changed.
Contact your prescriber, pharmacist, or another qualified healthcare professional if vomiting is severe, keeps happening, worries you, or makes it hard to drink. Seek urgent medical help for severe or rapidly worsening symptoms, severe persistent abdominal pain, or signs that you may be becoming dehydrated.