Conclusions : International differences in prescriber behaviour may influence , and in turn be influenced by , the conduct of clinical trials .
Objective : International differences are thought to exist in dosages used by clinicians treating mood disorders .
This study examined international dosage differences in antidepressant clinical trials , using a data base formed and maintained as a component of a Cochrane review of comparative clinical trials of fluoxetine .
Acute Efficacy of Fluoxetine Versus Sertraline and Paroxetine in Major Depressive Disorder Including Effects of Baseline Insomnia
This study assessed whether fluoxetine , sertraline , and paroxetine differ in efficacy and tolerability in depressed patients and the impact of baseline insomnia on outcomes . Patients ( N = 284 ) with DSM-IV major depressive disorder were r and omly assigned in a double-blind fashion to fluoxetine , paroxetine , or sertraline for 10 to 16 weeks of treatment . Using the Hamilton Rating Scale for Depression ( HAM-D ) sleep disturbance factor score , patients were categorized into low ( < 4 ) or high ( ≥4 ) baseline insomnia subgroups . Changes in depression and insomnia were assessed . Safety assessment s included treatment-emergent adverse events ( AEs ) , reasons for discontinuation , and AEs leading to discontinuation . In addition , AEs were evaluated within insomnia subgroups to determine emergence of activation or sedation . Depression improvement , assessed with the HAM-D-17 total score , was similar among treatments in all patients ( p = 0.365 ) and the high ( p = 0.853 ) and low insomnia ( p = 0.415 ) subgroups . Insomnia improvement , assessed with the HAM-D sleep disturbance factor score , was similar among treatments in all patients ( p = 0.868 ) and in the high ( p = 0.852 ) and low insomnia ( p = 0.982 ) subgroups . Analyses revealed no significant differences between treatments in the percentages of patients with substantial worsening , any worsening , worsening at endpoint , or improvement at endpoint in the HAM-D sleep disturbance factor in either insomnia subgroup . Treatments were well tolerated in most patients . No significant differences between treatments in the incidence of AEs suggestive of activation or sedation were seen in the insomnia subgroups . These data show no significant differences in acute treatment efficacy and tolerability across fluoxetine , sertraline , and paroxetine in major depressive disorder patients . Improvement in overall depression and in associated insomnia was achieved by most patients regardless of baseline insomnia
Conclusions : International differences in prescriber behaviour may influence , and in turn be influenced by , the conduct of clinical trials .
Objective : International differences are thought to exist in dosages used by clinicians treating mood disorders .
This study examined international dosage differences in antidepressant clinical trials , using a data base formed and maintained as a component of a Cochrane review of comparative clinical trials of fluoxetine .