Citing a warning by the FDA and a study published in the New England Journal of Medicine that reported the Zithromax Z-Pak antibiotic raises the risk for sudden cardiovascular death by a factor of 2.5 over other antibiotics, ABC news reports that the US federal government has required the labels of Zithromax Z-Pak be changed to include new warnings.

Read the full story about the danger of Zithromax Z-Pak here, where ABC News has also provided an explanatory video clip.