What is the GLP-1 side effects timeline?
Medically reviewed
The pattern across STEP and SURMOUNT trials is consistent: nausea, constipation, and reflux peak within the first few days of each dose escalation, then taper. By week 12 on a stable dose, most participants report symptoms as mild or absent (FDA post-market safety).
- Weeks 1–4: Initial dose. Mild nausea, fatigue, headache common.
- Weeks 4–12: Dose escalations. Each step triggers a 24–72h symptom window.
- Weeks 12–24: Maintenance dose reached. Symptoms typically fade.
- Beyond 6 months: Most users are largely asymptomatic.
Related questions
Does slower titration reduce side effects?
Yes — extending each step to 6–8 weeks instead of 4 is a well-tolerated way to reduce GI symptoms.
When should I worry?
Severe abdominal pain radiating to the back, persistent vomiting, or signs of dehydration warrant urgent medical review.