Pilot study of zatosetron (LY277359) maleate, a 5-hydroxytryptamine-3 antagonist, in the treatment of anxiety.

The aim of this study was to make a preliminary investigation of the efficacy and safety of zatosetron maleate, a selective 5-hydroxytryptamine-3 receptor antagonist for patients with a broad range of anxiety symptoms. A double-blind, parallel, placebo-controlled pilot study was conducted in 43 patients, aged 18 to 65 years, scoring >17 on the Hamilton Rating Scale for Anxiety (HAM-A). Patients were randomly assigned to either a fixed oral dose of 0.2, 1, or 5 mg of zatosetron or placebo for 4 weeks, followed by a 2-week placebo phase. Enhanced blinding procedures reduced the influence of side effects on efficacy ratings and obscured phases of the research design to patient and clinician. A change in HAM-A scores from baseline to endpoint was the principal efficacy measure; HAM-A Psychic and Somatic subscales, the Symptom Checklist-90, Montgomery-Asberg Depression Rating Scale, and Clinical Global Impressions Scale subscales provided secondary change indices. Adverse events (AEs) (spontaneously mentioned and elicited with the Udvalg for Kliniske Undersøgelser side effect rating scale), vital signs, electrocardiographic findings, and laboratory analytes were compared among treatment groups. Eighty-eight percent of the patients met the criteria for generalized anxiety disorder. No statistically significant differences in outcome measures differentiated among the four treatment groups. However, a pattern of greater change in the HAM-A scores seemed to favor zatosetron over placebo. Placebo was associated with only modest HAM-A score changes and a 30% response rate. The greatest numeric decrease in the HAM-A score and the highest response rate (45%) occurred in the groups receiving 0.2 and 1 mg of zatosetron. The secondary measures of efficacy demonstrated similar outcomes. There were no deaths or serious AEs reported in this study. This pilot study demonstrated that zatosetron at doses of 0.2 to 5 mg/day was safe. Although statistical significance was not achieved, the results show a greater numeric trend toward reducing anxiety with zatosetron than with placebo.

Fluoxetine treatment of patients with major depressive disorder who failed initial treatment with sertraline.

BACKGROUND: This study was conducted to determine if patients with major depressive disorder who had previously failed treatment with one serotonin selective reuptake inhibitor (SSRI) would respond to a different SSRI. METHOD: Adult outpatients (N = 106) with DSM-III-R major depressive disorder and a history of either intolerance (N = 34) or nonresponse (N = 72) to treatment with sertraline were treated with fluoxetine (mean dose = 37.2 mg/day) in a standardized, open-label, 6-week clinical trial. Outcome was assessed at each visit using the Hamilton Rating Scale for Depression (HAM-D), the Clinical Global Impressions (CGI-Improvement and CGI-Severity) scales, and the Patient's Global Improvement (PGI) scale. RESULTS: Ninety-one patients (86%) completed the study. Sixty-seven patients (63%) responded to fluoxetine (i.e., experienced > or = 50% reduction in HAM-D28 total score at endpoint versus baseline). In addition, clinically and statistically significant improvements were noted on all measures of depressive symptoms and global functioning. There was a nonsignificant trend for patients with a history of less vigorous sertraline trials to respond more favorably to fluoxetine. Fluoxetine therapy was generally well tolerated, and there were only slight differences in adverse events reported by patients who had been intolerant to sertraline versus those who were nonresponders. CONCLUSION: These findings indicate that fluoxetine and sertraline, two widely used SSRIs, are not interchangeable. Patients who either have had trouble tolerating or have not responded to sertraline may do well on fluoxetine treatment.