A Study to Evaluate the Efficacy and Safety of Cabergoline Compared With Placebo for the Treatment of RLS

Inclusion Criteria: * Idiopathic RLS * Moderate to severe symptoms as indicated by an IRLS total score greater than or equal to 10 and a severity at night score of greater than or equal to 4 * In a baseline polysomnography, patients had to have periodic leg movements during sleep arousal index greater than 5/hour of total sleep time Exclusion Criteria: * Patients suffering from seconadry RLS, due to causes such as iron deficiency or renal disease, or suffering from secondary RLS while taking drugs suspected of causing secondary forms of RLS