In a recent breakthrough study, researchers identified previously hidden and unreported side effects resulting from GLP-1 weight loss and diabetes medications such as semaglutide and tirzepatide.
The research is based on an analysis of more than 400,000 messages on the social media platform Reddit, over a period of more than 5 years.
The findings published in Nature Healthhave highlighted two main types of symptoms, including reproductive and temperature-related symptoms.
Specifically, users reported symptoms such as irregular menstrual cycles, heavy bleeding, intermenstrual bleeding, hot flashes, fever and chills, which were not described during the clinical trials.
Moreover, in these online posts, users also complained of fatigue as a persistent symptom.
According to Sharath Chandra Guntuku, Research Associate Professor in Computer and Information Science (CIS) at Penn Engineering and senior author of the study: “Some of the side effects we found, such as nausea, are well known, which shows that the method is picking up a real signal.”
“The underreported symptoms are clues that came unsolicited from the patients themselves, and doctors could potentially pay attention to them,” Guntuku added.
While the study’s findings are limited by Reddit’s specific demographics, focusing on younger American men, the side effects reported by this group closely match established clinical data for semaglutide and tirzepatide.
About 44% of users reported experiencing at least one known side effect, with gastrointestinal problems being the most common complaint.
Lyle H. Ungar, PhD, professor at Penn Engineering, notes that while clinical trials are excellent at identifying high-risk safety issues, they often miss the day-to-day symptoms that most affect patients.
“Online patient communities work much like a neighborhood community. People living with these medications exchange notes with each other in real time and share experiences that rarely result in a doctor’s visit or an official report. Even though social media is not necessarily representative, a large collection of messages can reflect additional concerns,” he added.
According to researchers, these findings will encourage experts and drug developers to take into account the symptoms posted by users online.
In the near future, the study authors hope to expand their research beyond Reddit with the aim of delving into even more unreported symptoms.
