PMID: 9004052Feb 1, 1997Paper

Electrocardiographic effects of fluoxetine and doxepin in patients with major depressive disorder

Journal of Clinical Psychopharmacology
B BakerM J Irvine

Abstract

Cardiovascular adverse effects are amongst the most serious observed with antidepressant drugs and are often due to effects on cardiac conduction and refractoriness. However, such electrophysiologic effects may not be evident when using conventional electrocardiographic measures. Forty patients with major depressive disorder (according to DSM-III-R criteria) were enrolled in a 6-week double-blind parallel group study of fluoxetine (N = 20) or doxepin (N = 20). Cardiac conduction (QRS duration) and repolarization (corrected QT interval, QTc), were measured using signal-averaged electrocardiograms and 12-lead electrocardiogram at baseline and after 2, 4, and 6 weeks of treatment. Patients taking doxepin (mean daily dosage at 6 weeks 169 +/- 42 mg) were similar to those taking fluoxetine (37 +/- 18 mg) for demographic variables and improvement in depression scores but volunteered more side effects (p = 0.011), especially dry mouth (p < 0.001) and dizziness/lightheadedness (p = 0.005). After 6 weeks, doxepin increased heart rate (69 +/- 12 to 81 +/- 13 beats per minute; p = 0.0003) and prolonged QTc (from 417 +/- 36 to 439 +/- 28 msec; p < 0.03); overall QRS duration was not prolonged but was correlated with serum doxepin concentra...Continue Reading

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