Mallinckrodt Pharmaceuticals, facing billions of dollars in legal costs over its role in the nation's opiod crisis, filed for bankruptcy early Monday. Mallinckrodt Pharmaceuticals is a registered business name of Mallinckrodt plc, which is registered in Ireland as a public limited company with registration number 522227 and has its registered office at … Mallinckrodt Pharmaceuticals is an Irish–tax registered manufacturer of specialty pharmaceuticals (namely, adrenocorticotropic hormone), generic drugs and imaging agents. In 2017 it generated 90% of sales from the U.S. healthcare system.

Mallinckrodt Pharmaceuticals is a registered business name of Mallinckrodt plc, which is registered in Ireland as a public limited company with registration number 522227 and has its registered office at … While Mallinckrodt is headquartered in Ireland for tax purposes, its operational headquarters are in the U.S. Mallinckrodt's 2013 tax inversion to Ireland drew controversy when it was shown Acthar, was Medicaid's most expensive drug.