Nausea after the dose, a day without energy, a stomach in slow motion - most people on GLP-1 know at least one of these feelings, especially at the start of therapy. Their mere presence is usually not the problem. The problem is when you do not know when they occur, after what, and whether things are improving - because then there is no way to manage them. The solution costs one sentence a week: a note.
The most common symptoms - and why these
GLP-1 slows stomach emptying and acts on satiety centres - hence the typical set:
- nausea (the most common, especially in the first weeks and after a dose increase),
- constipation or diarrhoea - the gut also adjusts to the new pace,
- belching, heartburn, feeling full after smaller portions than before,
- fatigue and headaches - often secondary: you eat and drink less than you think.
Most of them are transient - the body adapts within days or weeks. But "most" and "usually" are statistics; only a written record will show your specific course.
Symptoms have a rhythm - relative to the dose
This is the most important point of the whole post: GLP-1 side effects are rarely random. For many people they hit hardest in the first day or two after the injection, and intensify temporarily after every dose increase - we explain why the therapy schedule works that way in the post on dose escalation. Once you know your rhythm, you stop being surprised: you know "tomorrow may be rough" and plan the day around it.
How to take notes that actually mean something
You do not need a medical scale or a form. One sentence at every injection is enough (right where you log the dose and site - the full scheme is in the injection log):
- "nausea in the evening, fine by morning",
- "nothing special",
- "rough day 2, ate little, drank little".
After 4-6 weeks such notes arrange themselves into a pattern you would never see from memory: whether the new dose is worse than the previous one, whether symptoms fade with time, whether they always hit the same day.
What usually helps (practice, not prescription)
- Smaller portions, slower eating - the stomach works slower, do not race it.
- Less fatty and fried food on injection day and the day after - the most common nausea triggers.
- Water in small sips throughout the day - dehydration can impersonate a "side effect of the medication"; how much to drink, calculate here.
- Fibre and movement for constipation - and before you reach for anything from the pharmacy, tell your doctor about the problem.
Red flags - not material for a "later" note
The vast majority of symptoms are harmless adaptation, but a few things require urgent contact with a doctor, not observation:
- severe, worsening abdominal pain (especially radiating to the back),
- vomiting that prevents you from drinking, and signs of dehydration,
- jaundice, strong pain under the right rib,
- signs of an allergic reaction (swelling, shortness of breath, hives).
Talking to your doctor: specifics instead of impressions
At the appointment, "I feel sick sometimes" gives your doctor nothing. Notes do: "nausea after 3 of the last 4 doses, always within the first day, weaker than a month ago". That kind of specificity genuinely shapes decisions - about the pace of escalation, about holding the dose, about supportive medication.
In Kalori you add a well-being note at the injection together with the dose and site, and in the dose history you see your notes grouped under each dose - "how I handled 0.5 mg" is one glance. Before a visit, everything folds into a ready summary for your doctor. Local, no account.
Summary
GLP-1 side effects are common, usually transient and almost always rhythmic. One sentence of notes per injection turns them from random unpleasantness into a predictable pattern - and a pattern is something you and your doctor can manage.
This article is for information only and is not medical advice. Always consult worrying symptoms with a doctor - urgently if they match the red flags above.