Clinical Efficacy of a Kava Extract in Patients with Anxiety Syndrome/Double-blind placebo controlled study over 4 weeks. In a randomized, placebo-controlled double-blind study two groups each containing 29 patients with anxiety syndrome not caused by psychotic disorders were treated for a period of 4 weeks with kava extract WS 1490 (Laitan) 3 x 100 mg/day or a placebo preparation. Therapeutic efficacy was assessed by the Hamilton-Anxiety-Scale (main target variable), the Adjectives-List and the Clinical-Global-Impression-Scale (secondary target variables) after 1, 2 and 4 weeks of treatment. The HAMA overall score of anxiety symptomatology revealed a significant reduction in the drug receiving group already after one week of treatment. This difference between the two groups of patients increased in the course of the study. The results of the secondary target variables were in agreement with the HAMA-score and demonstrate the efficacy of WS 1490 in patients with anxiety disorders. No adverse experiences caused by the medication were noted during the 4 week administration of WS 1490.