Self-Reported Adverse Effects in Social Media Users of Unapproved Retatrutide

By
Neil K. R. Sehgal
Jena Shaw Tronieri
Benjamin Rader
Lyle Ungar
Sharath Chandra Guntuku
October 14, 2026

Jama Network Open

Overview

A cross-sectional analysis of Reddit posts identified 7,823 users with at least one mapped symptom after excluding prespecified weight-loss and appetite-suppression terms. The most frequently reported terms included increased appetite, fatigue, increased energy, nausea, food craving, insomnia, and increased heart rate; these are self-reported social media observations, not verified adverse drug reactions.

Background

Retatrutide is an investigational once-weekly agonist of the GIP, GLP-1, and glucagon receptors, and nonapproved products have been marketed directly to consumers. The FDA has cautioned about these products, including items labeled for research or not for human consumption. In a phase 2 obesity trial, gastrointestinal events—nausea, diarrhea, vomiting, and constipation—were the most frequent adverse events, while phase 3 trials were ongoing in the article’s reporting context. Social media analysis may complement conventional pharmacovigilance by capturing patient-reported experiences that are not adequately represented in spontaneous reporting systems.

Data Highlights

Measure	Finding
Reddit material analyzed	148,640 posts and comments from 38,936 users across 27 communities, May 2021–December 2025
Posts/comments classified as reporting current retatrutide use	45,592, from 13,589 unique users; use reports dated March 10, 2023–December 31, 2025
Users with at least one extracted MedDRA concept before exclusions	9,699 (71.4%)
Analytic denominator after prespecified exclusions	7,823 users (57.6%) with at least one mapped Preferred Term
Leading reported Preferred Terms	Increased appetite, fatigue, increased energy, nausea, food craving, insomnia, and increased heart rate
Comparison with prior semaglutide and tirzepatide social media analyses	Retatrutide discussions had greater representation in appetite, general-system, muscle-related, sleep, and heart-rate or pulse categories; semaglutide and tirzepatide discussions had greater representation in nausea and vomiting and gastrointestinal motility categories. Comparisons were descriptive, with no statistical testing or matching of demographic and clinical characteristics.

Key Findings

The analysis used a large public Reddit dataset and language-model classification to identify self-reported retatrutide use, symptoms, and MedDRA Preferred Terms; manual review of 100 posts demonstrated high precision and recall for use classification and symptom extraction.
After prespecified weight-related and appetite-suppression terms were removed, 7,823 users (57.6% of those classified as current users) had at least one mapped symptom term.
The leading reported terms were increased appetite, fatigue, increased energy, nausea, food craving, insomnia, and increased heart rate.
Compared descriptively with prior social media analyses, retatrutide discussions showed greater representation of appetite, general-system, muscle-related, sleep, and heart-rate or pulse categories; semaglutide and tirzepatide discussions showed greater representation of nausea and vomiting and gastrointestinal motility categories.
The authors noted that increased-appetite reports were unexpected in light of early-trial weight-loss findings; the social media analysis does not establish causality or verify product contents or exposure.
Related social media pharmacovigilance studies describe these data as complementary to regulatory reports and other sources, while recognizing that natural-language processing may not capture or map all adverse-event reports.

Clinical Implications

The findings describe symptoms attributed by Reddit users to retatrutide and may inform formal pharmacovigilance attention, as the study authors proposed. They should be interpreted as descriptive, self-reported signals rather than incidence estimates or evidence of causation; the analysis did not verify exposure, match comparison samples, or perform statistical comparisons.

Conclusion

This Reddit analysis identified a range of self-reported symptoms among users describing retatrutide use, including appetite, fatigue, sleep, and heart-rate-related terms. The observations provide a complementary source of safety information but require interpretation alongside clinical-trial and formal pharmacovigilance evidence.