What is a common side effect of levofloxacin?

Levofloxacin is a fluoroquinolone antibiotic that is known to be associated with several side effects, one of which is QT prolongation. This effect is particularly relevant because levofloxacin can interfere with the heart's electrical system, potentially leading to serious arrhythmias, including torsades de pointes, especially in patients with pre-existing risk factors such as electrolyte imbalances or those taking other medications that prolong the QT interval. Monitoring of the QT interval is important in patients who are prescribed levofloxacin.

While nausea is a common adverse effect of many medications, including levofloxacin, it is generally more common and less serious compared to the potential for QT prolongation. Nephrotoxicity is also a consideration with certain antibiotics; however, levofloxacin does not have a strong association with nephrotoxicity in the same way that some other classes of antibiotics do. Arrhythmia itself is a potential consequence of QT prolongation, but it is not a common direct side effect of levofloxacin without the context of QT interval changes.

Overall, the recognition of QT prolongation as a notable side effect of levofloxacin highlights the importance of being cautious with its use, especially in patients who may already