• Marit Stordal Bakken, Anders Engeland, Lars B Engesæter, Anette Hylen Ranhoff, Steinar Hunskaar, and Sabine Ruths.
• Department of Global Public Health and Primary Care, University of Bergen, PB 7804, 5020, Bergen, Norway, marit.bakken@igs.uib.no.
• Eur. J. Clin. Pharmacol. 2014 Jul 1; 70 (7): 873-80.

PurposeAnxiolytics and hypnotics are widely used and may cause injurious falls. We aimed to examine associations between exposure to anxiolytics and hypnotics and the risk of hip fracture among all older people in Norway. Further, we wanted to examine associations between exposure to hypnotics and time of fracture.MethodsA nationwide prospective cohort study of people in Norway born before 1945 (n=906,422) was conducted. We obtained information on all prescriptions of anxiolytics and hypnotics dispensed in 2004-2010 (the Norwegian Prescription Database) and all primary hip fractures in 2005-2010 (the Norwegian Hip Fracture Registry). We compared the incidence rates of hip fracture during drug exposure and non-exposure by calculating the standardized incidence ratio (SIR).ResultsAltogether, 39,938 people (4.4%) experienced a primary hip fracture. The risk of hip fracture was increased for people exposed to anxiolytics (SIR 1.4, 95% confidence interval (CI) 1.4-1.5) and hypnotics (SIR 1.2, 95% CI 1.1-1.2); the excess risk was highest regarding short-acting benzodiazepine anxiolytics (SIR 1.5, 95% CI 1.4-1.6). Benzodiazepine-like hypnotics (z-hypnotics) were associated with higher excess risk of hip fracture at night (SIR 1.3, 95% CI 1.2-1.4) than during the day (SIR 1.1, 95% CI 1.1-1.2).ConclusionsOlder people had an increased risk of hip fracture during anxiolytic or hypnotic drug use, including short-acting benzodiazepine anxiolytics and z-hypnotics that were previously considered less harmful; cautious prescribing is therefore needed. People using z-hypnotics were at greatest excess risk at night; this association deserves further investigation.

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