A Randomized, Double‐Blind, Controlled Phase II Study of Foliglurax in Parkinson's Disease

BACKGROUND: Agents targeting the metabotropic glutamate receptor 4 have emerged as a potentially attractive new class of drugs for the treatment of Parkinson's disease (PD). OBJECTIVE: The objective of this study was to evaluate the efficacy and safety of foliglurax in reducing off time and dyskinesia in patients with PD. METHODS: This was a 28‐day, multicenter, randomized, placebo‐controlled, double‐blind clinical trial of foliglurax 10 and 30 mg as adjunct to levodopa in 157 randomly assigned patients with PD and motor complications. RESULTS: Although dose‐dependent decreases in daily awake off time were apparent following treatment with foliglurax, the change from baseline to day 28 in off time (primary endpoint) and dyskinesia (secondary endpoint) did not improve significantly compared with placebo for either foliglurax dose. Treatment with foliglurax was generally safe, and there were no relevant safety signals. CONCLUSIONS: There was no evidence in this study that foliglurax has efficacy in improving levodopa‐induced motor complications in PD. © 2022 The Authors. Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society