Answer
Yes. It has been associated with QT prolongation and rare serious ventricular arrhythmias, particularly when electrolyte or cardiac risk factors are present.
Sources for this answer
- Foscarnet sodium Tillomed 24 mg/ml 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.