LONDON, Sept. 15, 2015 (GLOBE NEWSWIRE) -- GW Pharmaceuticals plc (Nasdaq:GWPH) (AIM:GWP) ("GW," "the Company" or "the Group"), a biopharmaceutical company focused on discovering, developing and commercializing novel therapeutics from its proprietary cannabinoid product platform, today announced positive top line results from an exploratory Phase 2a placebo-controlled clinical trial of Cannabidiol (CBD) in 88 patients with schizophrenia who had previously failed to respond adequately to first line anti-psychotic medications. In the trial, patients remained on their anti-psychotic medication and were randomized to receive CBD or placebo as adjunct therapy.

Over a series of exploratory endpoints, CBD was consistently superior to placebo, with the most notable differences being in the PANSS positive sub-scale (p=0.018), the Clinical Global Impression of Severity (p=0.04) and Clinical Global Impression of Improvement (p=0.02). The proportion of responders (improvement in PANSS Total score greater than 20%) on CBD was higher than that of participants on placebo,...