AI Study Examines Reddit Posts for GLP-1 Side Effect Reports
Researchers at the University of Pennsylvania say artificial intelligence may help identify side effects of popular weight loss and diabetes drugs that patients discuss online but that may not be fully captured in clinical trials or official drug documents.
In a study published in Nature Health, the research team analyzed more than 400,000 Reddit posts from nearly 70,000 users over more than five years. The posts focused on GLP-1 medications, including semaglutide and tirzepatide, which are widely used for obesity treatment and blood sugar control.
The researchers found that many users reported known side effects, especially gastrointestinal symptoms such as nausea. They said this supported the usefulness of the method. However, the analysis also identified less commonly documented complaints, including menstrual irregularities, chills, hot flashes, feeling cold, and fatigue.
The authors emphasized that the study does not prove the medications caused these symptoms. Instead, they said the findings should be viewed as signals that may merit further scientific review. Nearly 4% of Reddit users in the sample reported menstrual-related symptoms, a figure researchers said could be higher in a female-only group.
The study used large language models to connect informal descriptions from social media posts with standardized medical terminology. Researchers said this approach allows large volumes of patient discussion to be reviewed more quickly than older methods.
The team noted several limitations. Reddit users are not representative of the general population and are more likely to be younger, male, and based in the United States. The researchers plan to expand their work to other platforms, languages, and countries.
They said AI-assisted monitoring of online health discussions is not a substitute for clinical trials or formal adverse event reporting. However, they suggested it could help identify emerging patient concerns more rapidly, particularly as widely used medications and wellness products spread quickly.