How to track GLP-1 side effects
A simple symptom log turns "I've felt off lately" into something your doctor or pharmacist can act on. Here's what to record and a template you can copy.
What to write down each time
| Field | Example | Why it helps |
|---|---|---|
| Date and time | Thu 8 pm | Shows patterns over the week |
| Days since last dose | Day 2 | Links symptoms to the dose cycle |
| Symptom | Nausea | Use the same words each time |
| Strength | Mild / moderate / severe | Shows if it is getting better or worse |
| Context | After a large, fatty meal | Helps find triggers |
| Dose at the time | As written on your label | Useful after a dose change |
Look for patterns, then bring them to your appointment
After two or three weeks, count how often each symptom happened and on which days after the dose. Bring that summary to your next appointment or pharmacy visit. Don't change your dose or schedule on your own; ask your prescriber.
Commonly reported side effects
Health Canada product monographs for GLP-1 medications list gastrointestinal effects (nausea, diarrhea, vomiting, constipation, abdominal pain) as the most common. Others include decreased appetite, indigestion, tiredness and injection-site reactions. Your medication's patient information has the full list.
Get medical help right away for severe stomach pain that won't go away, signs of an allergic reaction (swelling of the face or throat, trouble breathing), or signs of dehydration. In an emergency, call 911.
Frequently asked questions
What are the most common side effects of GLP-1 medications?
Product monographs list stomach and bowel effects as the most common, such as nausea, diarrhea, vomiting, constipation and stomach pain. They are often reported when starting or after a dose change. Your prescriber and pharmacist can tell you what to expect with your medication.
When should I get help right away?
Product monographs tell patients to seek medical help for severe, persistent stomach pain (with or without vomiting), signs of a serious allergic reaction, or symptoms of dehydration. In an emergency call 911.
Why log the day after my dose?
Many people notice symptoms follow a weekly pattern. Recording how many days after the dose a symptom appears gives your provider much clearer information than "I felt sick sometimes."