Irlab Therapeutics AB’s phase IIb exploration of the dopamine D3-receptor with the Ipsen SA-partnered oral antagonist mesdopetam in Parkinson’s disease (PD) levodopa-induced dyskinesia (LID) fell short in terms of the primary endpoint, but the company is holding out hope. Mesdopetam missed the primary endpoint of change in daily hours of “on” time – periods of adequate PD control – without troublesome dyskinesia as shown in patient diaries, the company said.