The effect of eszopiclone in patients with insomnia and coexisting rheumatoid arthritis: a pilot study.

OBJECTIVE To evaluate the efficacy and safety of eszopiclone 3 mg, a nonbenzodiazepine medication/hypnotic indicated for the treatment of insomnia with comorbid rheumatoid arthritis (RA). METHOD This multicenter, double-blind, placebo-controlled pilot study was conducted in 153 patients aged 25-64 years with American College of Rheumatology-defined RA who met DSM-IV criteria for insomnia. The data were collected from February to November of 2004. Patients were randomly assigned to either eszopiclone or placebo nightly for 4 weeks, followed by a 2-week placebo run out. Efficacy was evaluated using patient reports of sleep (wake time after sleep onset [WASO], sleep latency [SL], and total sleep time [TST]), daytime function, pain, and RA assessments. Insomnia severity was evaluated using the Insomnia Severity Index. Safety was also evaluated. RESULTS Eszopiclone significantly improved all patient-reported sleep measures (WASO, SL, and TST), sleep quality, depth of sleep, and daytime function (P < .05 vs placebo). At week 4, 48% of eszopiclone-treated patients had no clinically meaningful insomnia as assessed by ISI score (versus 30% of placebo-treated patients, P = .03). Eszopiclone was significantly better than placebo on some RA-associated pain measures: (1) overall (P = .05), pain (P = .006), and pain and other symptoms (P = .02) scores of the Arthritis Self-Efficacy Scale, (2) tender joint counts (P = .03) and pain severity scores (P = .023), (3) the activities domain of the Health Assessment Questionnaire-Disability Index (P = .04), and (4) the role physical (P = .03) and bodily pain (P = .01) scales of the 36-item Medical Outcomes Study Short-Form General Health Survey. The most commonly reported adverse events with eszopiclone were unpleasant taste and transient increases in RA symptoms. CONCLUSIONS In this pilot study of patients with insomnia comorbid with RA, eszopiclone 3 mg improved all assessed sleep and daytime function measures over the treatment period, as well as some measures of RA-associated pain, disability, and quality of life. TRIAL REGISTRATION clinicaltrials.gov Identifier: NCT00367965.