Background In nursing home residents, the use of tricyclic andother heterocyclic antidepressants is associated with an increasedrisk of falls. The newer selective serotonin-reuptakeinhibitorantidepressants are largely free of the side effects of thetricyclic agents thought to cause falls and so have been hypothesizedto be safer for those at high risk for falls.
Methods We retrospectively identified an inception cohort of2428 nursing home residents in Tennessee who were new usersof tricyclic antidepressants (665 subjects), selective serotonin-reuptakeinhibitors (612 subjects), or trazodone (304 subjects) or nonusersof antidepressants (847 subjects). We ascertained the numberof falls during therapy and during a similar follow-up periodfor nonusers, then calculated the rate ratios for falls withadjustments for an extensive set of potential confounding factors.
Results The new users of each type of antidepressant had higherrates of falls than the nonusers, with adjusted rate ratiosof 2.0 (95 percent confidence interval, 1.8 to 2.2) for tricyclicantidepressants, 1.8 (1.6 to 2.0) for selective serotonin-reuptakeinhibitors, and 1.2 (1.0 to 1.4) for trazodone. The rate ratiosincreased with the daily dose for tricyclic antidepressants,reaching 2.4 (95 percent confidence interval, 2.1 to 2.8) fordoses of 50 mg or more of amitriptyline or its equivalent, andfor the serotonin-reuptake inhibitors, reaching 1.9 (1.7 to2.2) for 20 mg or more of fluoxetine or its equivalent. Theelevated rates of falls persisted through the first 180 daysof therapy and beyond.
Conclusions In this large study of nursing home residents, therewas little difference in rates of falls between those treatedwith tricyclic antidepressants and those treated with selectiveserotonin-reuptake inhibitors. Hence, the preferential use ofthe newer antidepressants is unlikely to reduce the higher rateof falls among nursing home residents taking antidepressants.
Source Information
From the Division of Pharmacoepidemiology, Department of Preventive Medicine, Vanderbilt University School of Medicine, Nashville (P.B.T., P.G., W.A.R.); Cost Consulting, Nashville (T.W.C.); and Pharmaceutical Consulting Services, Murfreesboro, Tenn. (A.B.M.).
Address reprint requests to Dr. Ray at the Department of Preventive Medicine, Medical Center North, A-1124, Vanderbilt University Medical Center, Nashville, TN 37232.
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