The Medical Letter on Drugs and Therapeutics
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1398
Citalopram (Celexa) and QT Interval Prolongation
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The FDA has asked the manufacturers of the selective serotonin reuptake inhibitor (SSRI) antidepressant citalopram (Celexa, and others) to revise the labeling of the drug to include new warnings about the risk of QT interval prolongation.1

THE DATA — The FDA based its warnings on postmarketing reports of QT interval prolongation and the potentially fatal torsades de pointes cardiac arrhythmia in patients taking citalopram (number of patients and clinical details not specified) and on data from an unpublished study in 119 healthy non-depressed volunteers, which found that the change in corrected QT interval [QTc] was 8.5 msec with 20 mg/d of citalopram and 18.5 msec with 60 mg/d. The baseline QT interval in the study volunteers was not included in the FDA announcements, nor did it specify whether any developed a QT interval outside the normal range. The upper limit of normal ... more      

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Title: Citalopram (Celexa) and QT Interval Prolongation
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