Proven Safety and Low Cost of Metformin
“We don’t have therapies for long COVID, and we don’t know how to prevent it in people who have SARS-CoV-2 infections,” Dr. Erbelding noted. “This analysis points to metformin, a drug that millions of people have taken safely for their diabetes or their borderline diabetes. It’s licensed, it’s out there, and it’s inexpensive. The fact that we have data that point to this potentially being a therapy is important. I think that’s the power of this.”
Dr. Erbelding said a strength of the study is the size of the N3C Electronic Health Record Database (with data on nearly 9 million COVID cases) the researchers used to simulate the randomized controlled trial.
“(These results) gives us a reason to think about doing a large randomized controlled study with metformin,” she said. However, there are some limitations, she noted.
“The definition of long COVID may not have been applied exactly the same way across all the patients and you don’t know what led the prescribers to prescribe metformin. There might have been confounders that couldn’t be controlled for or weren’t evident in the way they approached the data.”
This study has “relatively rigorous methodology for an observational study,” Dr. Erbelding said. “It’s novel to try to simulate a randomized controlled trial through a large, observational, electronic record–based cohort. Maybe we should be doing more of this because these bioinformatic systems exist now. And we need to get all the public health use out of them that we can.”
“The fact that they may be unlocking something new here that needs follow-up in a truly randomized controlled trial is important as well because there are a lot of people out there suffering from long COVID.”
Bramante and Erbelding disclosed no relevant financial relationships. This research was supported in part by the intramural/extramural research program of the National Center for Advancing Translational Science, National Institutes of Health.
A version of this article appeared on Medscape.com.