Answer
It can prolong cardiac repolarisation, seen as QT prolongation, and rarely contribute to torsade de pointes, particularly when other risk factors are present.
Sources for this answer
- Hydroxyzine hydrochloride 25 mg film-coated tablets — Current selected SmPCemc · Summary of Product Characteristics
- UK GovernmentUK Government · Reputable Web
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.