The U.S. Food and Drug Administration (FDA) is refusing to say whether it will add the possible side effect of seizures to labels for the two most widely used COVID-19 vaccines, after researchers with the agency detected a safety signal for seizures following Moderna and Pfizer-BioNTech COVID-19 vaccination.
In a preprint paper published in late 2023, researchers with the FDA said that seizures and convulsions among children aged 2 to 5 after COVID-19 vaccination set off a safety signal in health care databases. A peer-reviewed version of the paper was published on April 24.





