The U.S. Food and Drug Administration recently warned that the popular anti-biotic azithromycin (Zithromax or Zmax) aka Z Pack has a potentially fatal side effect. The drug can cause an irregular heart rhythm from electrical activity changes. Those most at risk include those with:
– low blood evels of potassium or magnesium
- an abnormally slow heart rate
- arrhythmias and
- an existing QT interval prolongation.
Also, anyone already using drugs for treatment of abnormal heart rhythms is at risk. More information is available here.