✓ Independent editorial reviews of U.S. telehealth providers · Updated June 1, 2026 · Educational only — not medical advice
Journal · Evidence review

GLP-1 Side Effects: What the Evidence Says and How They're Managed

The most common GLP-1 side effects reported in trials, who should be cautious, and how gradual titration and clinician oversight reduce risk.

Published by Ranika Editorial Group LLCUpdated June 1, 2026
Direct Answer

What are the side effects of GLP-1 medications?

The most common GLP-1 side effects in trials are gastrointestinal — nausea, vomiting, diarrhea, and constipation — usually mild to moderate and most frequent during dose escalation. Gradual titration and clinician oversight reduce them. Some people should avoid GLP-1s; a licensed clinician should assess eligibility.

Disclaimer: American Telehealth Review is an editorial resource and does not provide medical advice, diagnosis, or treatment. Compounded medications are not FDA-approved finished drug products and should only be prescribed when clinically appropriate by a licensed healthcare provider. Brand-name medications such as Ozempic, Wegovy, Mounjaro, and Zepbound are FDA-approved under their own applications. Compounded semaglutide and compounded tirzepatide are not FDA-approved finished drug products.

What trials reported

Across STEP, SURMOUNT, and head-to-head data, gastrointestinal effects were the leading adverse events, generally easing after titration. Discontinuation due to side effects was relatively low but real, and varied between agents.

Reducing risk

Slow titration, hydration, dietary adjustments, and accessible clinician support reduce side-effect burden. Verify a program offers real medical oversight — see the evaluation checklist.

Frequently asked questions

What are the most common GLP-1 side effects?

Gastrointestinal symptoms — nausea, vomiting, diarrhea, constipation — usually mild to moderate and most common during dose escalation.

Who should avoid GLP-1 medications?

People with certain conditions should not take GLP-1s; a licensed clinician should evaluate eligibility.

Sources

  • Wilding JPH et al. Once-weekly semaglutide in adults with overweight or obesity (STEP 1). N Engl J Med. 2021.
  • Aronne LJ et al. Tirzepatide as compared with semaglutide for the treatment of obesity (SURMOUNT-5). N Engl J Med. 2025.
  • U.S. FDA — Medications containing semaglutide and tirzepatide; Compounding and the FDA (fda.gov).

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