Recorded dementia prescribed an antipsychotic in 2011 than in 2001, reflecting that recorded prevalence had increased. Time trends for individual drugs show that prescribing of the two drugs specifically warned 1317923 against (risperidone and olanzapine) fell rapidly in the Iloprost web quarter immediately after the 2004 risk communication, with partial replacement with other antipsychotics, predominately haloperidol initially (figure 2). The 2004 risk communication was associated with a transient decrease of 20.74 (21.34 to 20.14) in antipsychotic initiation, without any statistically significant change in trend. In contrast, the 2009 risk communication was not associated with any immediate change, but there was a downward change in trend of 20.17 (95 CI 20.28 to 20.06) (table 2, figure 3). For antipsychotic discontinuation, there was a 11967625 statistically significant transient increase immediately after the 2004 risk communication, but no subsequent change in trend, and no significant change of any kind following the 2009 risk communication (table 2, figure 4). Time trends in prescribing of other psychotropic drugs are shown in figure 4, with segmented regression results in table 2. The 2004 risk communication was associated with transient absolute increases in hypnotic, anxiolytic, and antidepressant prescribing of 1.37 (95 CI 0.75 to 2.00), 1.32 (0.76 to 1.89) and 1.78 (0.20 to 3.36) among patients age 65 and over with dementia respectively. Hypnotic prescribing was static before 2004, with anxiolytic and antidepressant prescribing both ITI 007 chemical information significantly increasing, but there was no significant change in trends in any of the three drug classes in association with the 2004 risk communication. The 2009 risk communication was not significantly associated with any immediate change in prescribing of any of the three drug classes, but was associated with significant decreases in trend of 20.25 per quarter for hypnotics, 20.37 per quarter for anxiolytics and 20.69 per quarter for antidepressants.Discussion Summary of FindingsAlthough causality cannot be definitively ascribed, both the 2004 and 2009 MHRA risk communications were associated with statistically significant changes in antipsychotic prescribing. However the magnitude and patterns of change associated with each risk communication differed significantly. The 2004 risk communication was associated with an immediate large fall in the level of antipsychotic prescribing and a moderate change in theRisk Communications and Antipsychotic PrescribingFigure 1. Prescribing of all oral antipsychotics in people aged 65 years with dementia. doi:10.1371/journal.pone.0068976.gTable 2. Segmented regression analysis of changes in antipsychotic and other psychotropic prescription in relation to the 2004 and 2009 risk communications.Baseline quarter 1 2001 (intercept) (95 CI) Oral antipsychotic prescribed Oral antipsychotic initiated Oral antipsychotic discontinued Hypnotic prescribed Anxiolytic prescribed Antidepressant prescribed 13.89 (13.24 to 14.53) 3.18 (2.47 to 3.89) 2.75 (1.92 to 3.58) 8.63 (8.06 to 9.20) 2.76 (2.24 to 3.27) 17.19 (15.74 to 18.63)Trend before 2004 risk communication (95 CI) 0.61 (0.53 to 0.68)b 0.04 (20.04 to 0.13) 20.06 (20.16 to 0.03) 0.02 (20.05 to 0.09) 0.14 (0.08 to 0.21)b 0.71 (0.53 to 0.88)bChange in level after 2004 risk communication (95 CI) 25.94 (26.64 to 25.23)b 20.74 (21.34 to 20.14)a 1.04 (0.24 to 1.84)a 1.37 (0.75 to 2.00)b 1.32 (0.76 to 1.89)b 1.78 (0.20 to 3.36)aChang.Recorded dementia prescribed an antipsychotic in 2011 than in 2001, reflecting that recorded prevalence had increased. Time trends for individual drugs show that prescribing of the two drugs specifically warned 1317923 against (risperidone and olanzapine) fell rapidly in the quarter immediately after the 2004 risk communication, with partial replacement with other antipsychotics, predominately haloperidol initially (figure 2). The 2004 risk communication was associated with a transient decrease of 20.74 (21.34 to 20.14) in antipsychotic initiation, without any statistically significant change in trend. In contrast, the 2009 risk communication was not associated with any immediate change, but there was a downward change in trend of 20.17 (95 CI 20.28 to 20.06) (table 2, figure 3). For antipsychotic discontinuation, there was a 11967625 statistically significant transient increase immediately after the 2004 risk communication, but no subsequent change in trend, and no significant change of any kind following the 2009 risk communication (table 2, figure 4). Time trends in prescribing of other psychotropic drugs are shown in figure 4, with segmented regression results in table 2. The 2004 risk communication was associated with transient absolute increases in hypnotic, anxiolytic, and antidepressant prescribing of 1.37 (95 CI 0.75 to 2.00), 1.32 (0.76 to 1.89) and 1.78 (0.20 to 3.36) among patients age 65 and over with dementia respectively. Hypnotic prescribing was static before 2004, with anxiolytic and antidepressant prescribing both significantly increasing, but there was no significant change in trends in any of the three drug classes in association with the 2004 risk communication. The 2009 risk communication was not significantly associated with any immediate change in prescribing of any of the three drug classes, but was associated with significant decreases in trend of 20.25 per quarter for hypnotics, 20.37 per quarter for anxiolytics and 20.69 per quarter for antidepressants.Discussion Summary of FindingsAlthough causality cannot be definitively ascribed, both the 2004 and 2009 MHRA risk communications were associated with statistically significant changes in antipsychotic prescribing. However the magnitude and patterns of change associated with each risk communication differed significantly. The 2004 risk communication was associated with an immediate large fall in the level of antipsychotic prescribing and a moderate change in theRisk Communications and Antipsychotic PrescribingFigure 1. Prescribing of all oral antipsychotics in people aged 65 years with dementia. doi:10.1371/journal.pone.0068976.gTable 2. Segmented regression analysis of changes in antipsychotic and other psychotropic prescription in relation to the 2004 and 2009 risk communications.Baseline quarter 1 2001 (intercept) (95 CI) Oral antipsychotic prescribed Oral antipsychotic initiated Oral antipsychotic discontinued Hypnotic prescribed Anxiolytic prescribed Antidepressant prescribed 13.89 (13.24 to 14.53) 3.18 (2.47 to 3.89) 2.75 (1.92 to 3.58) 8.63 (8.06 to 9.20) 2.76 (2.24 to 3.27) 17.19 (15.74 to 18.63)Trend before 2004 risk communication (95 CI) 0.61 (0.53 to 0.68)b 0.04 (20.04 to 0.13) 20.06 (20.16 to 0.03) 0.02 (20.05 to 0.09) 0.14 (0.08 to 0.21)b 0.71 (0.53 to 0.88)bChange in level after 2004 risk communication (95 CI) 25.94 (26.64 to 25.23)b 20.74 (21.34 to 20.14)a 1.04 (0.24 to 1.84)a 1.37 (0.75 to 2.00)b 1.32 (0.76 to 1.89)b 1.78 (0.20 to 3.36)aChang.
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