The government publicly released reports Friday of injuries that cited the possible involvement of Red Bull, the country’s top-selling energy drink, just days after its producer said it was unaware of such cases.

The Food and Drug Administration posted online 21 reports that had been filed with the agency since 2004 that mentioned Red Bull, including ones that involved hospitalizations for heart problems and vomiting. The mention of a product in a report of an injury or a death does not mean it caused it or contributed to it.

The release of the filings, after similar releases for three other highly caffeinated energy drinks, appears to underscore the crazy-quilt regulatory pattern governing such products. It also highlights the dearth of data that F.D.A. officials are confronting in determining whether to impose additional regulations.

On Saturday, Red Bull reiterated that it was not aware of any injury filings to the F.D.A. that mentioned it. In a statement, the company said, “As the F.D.A. stated, ‘the existence of an adverse event report does not necessarily mean that the product identified in the report actually caused the adverse event’.” Red Bull has said its beverages are safe.