Pharmaceutical US clinical-stage firm Apnimed, which is developing an oral drug product candidate, AD109, that is designed to address a root cause of obstructive sleep apnea (OSA), has announced that Japan’s Shionogi have entered into a definitive agreement for Shionogi to acquire Apnimed's 50% ownership of Shionogi-Apnimed Sleep Science (SASS). 25 March 2026