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The effects of pregabalin on sleep disturbance symptoms among individuals with fibromyalgia syndrome - Source: Sleep Medicine, Apr 2009

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By I Jon Russell, Alesia Sadosky, et al. • www.ProHealth.com • May 19, 2009


Objectives: Sleep disturbances are common in patients with fibromyalgia (FM). The objective of this analysis was to evaluate the effects of pregabalin [trade name Lyrica®] on sleep in patients with FM.

Methods: Analyses were based on two randomized, double-blind, placebo-controlled trials of pregabalin (300mg, 450mg, and 600mg daily) in adult FM patients. Sleep outcomes included the Medical Outcomes Study (MOS) Sleep Scale and a daily diary assessment of sleep quality. Treatment effects were evaluated using analysis of covariance. Clinically important differences (CID) in the Sleep Quality Diary and MOS Sleep Disturbance scores were estimated using mixed-effects models of changes in scores as a function of patients' global impressions of change. Mediation modeling was used to quantify the direct treatment effects on sleep in contrast to indirect influence of the treatment on sleep via pain.

Results: A total of 748 and 745 patients were randomized in the respective studies. Patients were predominantly Caucasian females, average age 48-50 years, on average had FM for 9-10 years, and experienced moderate to severe baseline pain.

Pregabalin significantly improved the Sleep Quality Diary (P<0.001), MOS Sleep Disturbance (P<0.01), MOS Quantity of Sleep (P<0.003), and MOS Sleep Problems Index scores (P<0.02) relative to placebo.

Treatment effects for the 450mg and 600mg groups exceeded the estimated clinically important differences (CID) thresholds of 0.83 and 7.9 for the Sleep Quality Diary and MOS Sleep Disturbance scores, respectively.

Mediation models indicated that 43% to 80% of the benefits on sleep (versus placebo) were direct effects of pregabalin, with the remainder resulting from an indirect effect of treatment via pain relief.

Conclusions: These data demonstrate improvement in FM-related sleep dysfunction with pregabalin therapy. The majority of this benefit was a direct effect of pregabalin on the patients' insomnia, while the remainder occurred through the drug's analgesic activity.

Source: Sleep Medicine, Apr 2009. PMID: 19410509, Russell IJ, Crofford LJ, Leon T, Cappelleri JC, Bushmakin AG, Whalen E, Barrett JA, Sadosky A. University Clinical Research Center, University of Texas Health Science Center at San Antonio, Texas; Division of Rheumatology & Women’s Health, University of Kentucky, Lexington, Kentucky; Pfizer Inc., New York, NY, USA. [E-mail: alesia.sadosky@pfizer.com]





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