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  • Title: Long-term open-label study of pramipexole in patients with primary restless legs syndrome.
    Author: Inoue Y, Kuroda K, Hirata K, Uchimura N, Kagimura T, Shimizu T.
    Journal: J Neurol Sci; 2010 Jul 15; 294(1-2):62-6. PubMed ID: 20451927.
    Abstract:
    A phase III, open-label, long-term clinical study was performed to evaluate the safety and efficacy of pramipexole in a cohort of 141 Japanese patients with primary restless legs syndrome (RLS). The patients were started on pramipexole 0.25 mg/day and were subsequently maintained on that dose or switched to 0.125, 0.5, or 0.75 mg/day to achieve optimal efficacy and tolerability. The International Restless Legs Syndrome Study Group Rating Scale for restless legs syndrome (IRLS) score improved from 22.3+/-4.7 at baseline to 11.1+/-7.7 at week 8 and 4.9+/-5.9 at week 52. IRLS responders, defined as patients whose IRLS total score decreased by > or =50% from baseline, accounted for 67.4% at week 12 and 86.6% at week 52. Over 90% of patients were Clinical Global Impression-global improvement (CGI-I) and Patient Global Impression (PGI) responders. The Pittsburgh Sleep Quality Index (PSQI) score decreased from 7.9+/-3.1 at baseline to 4.6+/-2.9 at week 52. Similarly, the Japanese version of the Epworth Sleepiness Scale score decreased from 9.3+/-5.2 to 4.9+/-3.8. Baseline IRLS score < or =20 was significantly associated with a complete IRLS response in this long-term study. Adverse events were typical of nonergot dopamine agonists, mild in intensity, and decreased in frequency as the study progressed. RLS augmentation was not observed. Pramipexole 0.25-0.75 mg/day is efficacious, safe, and well tolerated in patients with RLS. Pramipexole showed good efficacy, particularly in patients with an IRLS total score <20.
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