Objectives Alterations in serotonin impact bone metabolism in animal models, and selective serotonin reuptake inhibitors (SSRI) have been associated with increased fracture risk in older adults. SSRIs are commonly used in anorexia nervosa (AN), a condition that predisposes to low bone mineral density (BMD). Our objective was to determine whether SSRI use is associated with low BMD in AN. Methods We examined Z-scores for spine, hip and whole body (WB) BMD, spine bone mineral apparent density and WBBMC/height (Ht) in females with AN 12-21 years old who had never been on SSRIs, on SSRIs for <6 months (<6M) or >6 months (>6M). Results Subjects on SSRIs for >6M had lower spine, femoral-neck and WBBMD Z-scores than those on SSRIs for <6M. Hip BMD and WBBMC/Ht Z-scores were lowest in subjects on SSRIs for >6M. Duration of SSRI use, duration since AN diagnosis and duration of amenorrhea inversely predicted BMD, whereas BMI was a positive predictor. In a regression model, duration of SSRI use remained an independent negative predictor of BMD. Discussion Duration of SSRI use >6M is associated with low BMD in AN. Conclusion It may be necessary to monitor BMD more rigorously when duration of SSRI use exceeds 6M.
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