hydroxychloroquine sulfate · Medicine question

Can hydroxychloroquine sulfate prolong the QT interval and cause heart rhythm disturbances?

Name: Can hydroxychloroquine sulfate prolong the QT interval and cause heart rhythm disturbances?
Published: 2026-11-08T01:53:19.124Z

iatroX medicinesPublished 8 November 2026

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Yes, hydroxychloroquine sulfate can prolong the QT interval in patients with specific risk factors, potentially causing torsade de pointes or ventricular tachycardia; the frequency is unknown.

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Hydroxychloroquine sulfate 200mg FC tabletsZentiva · emc · SmPC §4.8 Undesirable effects · Version 13Document updated 20 January 2026

Sources checked 8 November 2026

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