JOURNAL ARTICLE

Open-label study of the long-term efficacy and safety of pramipexole in patients with Restless Legs Syndrome (extension of the PRELUDE study)

Markku Partinen, Kari Hirvonen, Leni Jama, Anniina Alakuijala, Christer Hublin, Ilkka Tamminen, Juergen Koester, Juergen Reess
Sleep Medicine 2008, 9 (5): 537-41
18276187

BACKGROUND AND OBJECTIVE: To demonstrate the long-term efficacy and safety of pramipexole for Restless Legs Syndrome (RLS) using physician and patient RLS ratings, along with subjective assays of sleep parameters, in a 26-week, open-label trial.

PATIENTS AND METHODS: Among 107 Finnish adults with moderate to severe RLS, pramipexole initiated at 0.125 mg/day was titrated to a maximum 0.75 mg/day. Efficacy evaluations included the International RLS Study Group Rating Scale (IRLS), Patient Global Impression (PGI) scale, Clinical Global Impressions-Improvement (CGI-I) scale, Epworth Sleepiness Scale (ESS), and Short Form-36 (SF-36) Health Survey. Subjective Sleep Quality was assessed by patient ratings of sleep and morning tiredness. Safety was documented by Adverse Events reported in >5% of patients.

RESULTS: The mean reduction in IRLS score was 73.5% (P<0.05). The IRLS responder rate, defined by score reduction of >or= 50%, was 81.3%. On the PGI scale, 89.7% of patients rated themselves as "very much" or "much" better. By CGI-I assessment, 94.8% of patients were considered either "very much" or "much" improved. Mean ESS score showed a modest but statistically significant reduction (P<0.05) within the normal range, indicating that long-term pramipexole did not increase daytime sleepiness. On the SF-36 all 8 domains showed improvement, 5 of them statistically significant (P<0.05) and 4 of these 5 (role-physical, bodily pain, vitality, and role-emotional) by >10 points on a 100-point scale. Subjective Sleep Quality also improved. The most frequent Adverse Events were influenza (17.8%), headache (15.0%), and fatigue (10.3%).

CONCLUSION: Pramipexole is well tolerated and effective for long-term treatment of RLS.

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