Answer
Yes. It can prolong cardiac repolarisation and rarely cause serious ventricular arrhythmias, particularly with existing QT risk factors or interacting medicines.
Sources for this answer
- Clarithromycin 500 mg powder for concentrate for solution for infusion — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.