Azithromycin Might Kill You, but That’s Not Why You Shouldn’t Take It


This week the ” target=”_blank”>New England Journal of Medicine (NEJM) published a study that tried to confirm this. The study compared rates of sudden death while taking a course of azithromycin to the risk while taking amoxicillin, ciprofloxacin, levofloxacin, or no antibiotic. The study was not randomized. It simply matched hundreds of thousands of antibiotic prescriptions to death certificates.

The study found a tiny increased risk in patients taking azithromycin. How tiny? Compared to taking amoxicillin, taking azithromycin contributed 47 additional cardiovascular deaths per 1 million antibiotic courses. That’s one extra death per 21,276 courses. If you took 5-day azithromycin courses continuously, it would take 291 years to take that many courses of antibiotics. That’s a much slower way to die than, say, hemlock.

All patients did not have the same risk of having a fatal heart rhythm abnormality. Older patients, patients taking medications for heart rhythm abnormalities, and patients with heart disease, certain EKG abnormalities, and certain electrolyte abnormalities were at greater risk of this side effect. The patients at highest risk face one additional death every 4,100 courses of antibiotics, while those at lowest risk have one additional death every 110,000. These are very, very small risks.

So doctors should try to avoid all macrolides in high risk patients. But patients should probably forget the whole thing and avoid azithromycin for a different reason.

The reason you should avoid azithromycin is the same as the reason you should avoid all antibiotics. The risk of ” target=”_blank”>a cold, or for ” target=”_blank”>sinus infection, all of which resolve without antibiotics.

It would be a sad irony if we needed the irrational fear of extremely rare side effects to counter the irrational exuberance that patients have for unnecessary antibiotics. I hope instead that educated patients armed with reliable information will make good decisions.

Learn more:

” target=”_blank”>FDA Strengthens Warnings On Pfizer Antibiotic (Wall Street Journal)
” target=”_blank”>Azithromycin (Zithromax or Zmax) and the risk of potentially fatal heart rhythms (FDA Drug Safety Communication)