A study has shown Z-Pak #2 (the five-day regimen) to increase the risk of cardiovascular death, mainly for those who already have cardiac issues. This information just shows that no medication is perfect. Doctors always have to weigh the bad with the good and Azithromycin has proven to be a very effective drug. http://www.lexi.com/
In dentistry, we usually use Z-Pak#1 which is the three-day regimen. It is extremely effective for fighting intraoral infections.