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  • Title: Efficacy and safety of pramipexole in idiopathic restless legs syndrome: a polysomnographic dose-finding study--the PRELUDE study.
    Author: Partinen M, Hirvonen K, Jama L, Alakuijala A, Hublin C, Tamminen I, Koester J, Reess J.
    Journal: Sleep Med; 2006 Aug; 7(5):407-17. PubMed ID: 16815748.
    Abstract:
    BACKGROUND AND PURPOSE: To evaluate the effects of pramipexole (0.125-0.75 mg/d) on polysomnographic (PSG) measures and patient and clinician ratings of restless legs syndrome (RLS). PATIENTS AND METHODS: Patients (n=109) with moderate to severe RLS were randomized to placebo or fixed doses of pramipexole during a 3-week, double-blind, placebo-controlled, dose-finding study. RESULTS: In each pramipexole dose group, the periodic limb movements during time in bed index (PLMI) decreased significantly, compared with placebo (adjusted mean difference in log-transformed data: 0.125 mg, -1.54; 0.25 mg, -1.93; 0.50 mg, -1.89; and 0.75 mg, -1.52; P<0.0001). At all doses, International RLS Study Group Rating Scale (IRLS) scores were also significantly reduced, with the greatest adjusted mean reduction in the 0.50mg group (-17.01). At all but the lowest pramipexole dose, the percentage of responders (> or =50% reduction of IRLS score) was substantially higher than for placebo (61.9-77.3, vs 33.3%). In the pramipexole groups, 50.0-77.3% of patients rated their condition as 'much better' or 'very much better', compared with 38.1% of patients in the placebo group (P=0.0139 for the 0.50 mg dose). Clinical global impressions (CGI) scale ratings of 'much improved' or 'very much improved' were given to 61.9-86.4% of patients in the pramipexole groups, compared with 42.9% in the placebo group (P<0.05 for the 0.25, 0.50, and 0.75 mg groups). Pramipexole was well tolerated and did not produce somnolence at any dose. CONCLUSION: Pramipexole is effective and safe in the treatment of both objective and subjective facets of RLS.
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