What a difference three short years can make. Flashback to 2023, and Irish-American pharmaceutical giant Mallinckrodt was reeling a year after emerging from examinership and Chapter 11 bankruptcy in the United States.  A $1.3 billion (€1.13 billion) debt writedown and a settlement of litigation claims involving thousands of US opioid victims was meant to rehabilitate the drugmaker. Instead, Ebitda dropped by 30 per cent year-on-year and the Dublin-headquartered group had to apply to be saved for a second time. Round two saw a US court approve a pre-pack rescue plan where Mallinckrodt’s primary lenders took over the manufacturer in a…