The Food and Drug Administration said Wednesday it has expanded existing warnings on the two leading COVID-19 vaccines about a rare heart side effect mainly seen in young men. Myocarditis, a type of heart inflammation that is usually mild, emerged as a complication after the first shots became widely available in 2021. Prescribing information from both Pfizer and Moderna already advises doctors about the issue. In April, the FDA sent letters to both drugmakers asking them to update and expand the warnings to add more detail about the problem and to cover a larger group of patients. While the FDA can mandate label changes, the process is often more of a negotiation with companies.
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