It was previously unknown whether macrolide antibiotics increased the risks of heart arrhythmia, a serious heart rhythm disturbance that can lead to death. New research is now bringing more clarity to this issue.

Fluoroquinolones are commonly prescribed to treat urinary tract infections and other illnesses. Recently, these antibiotics have been shown to cause potentially harmful side effects.

A common treatment for bronchitis, strep throat, pneumonia and earaches, azithromycin may also cause a deadly reaction in some patients, according to a new FDA warning.

If a pregnant woman needs azithromycin , a common antibiotic for various infections, her dosage amount may be determined by her race.