Two federal investigations — one examining opioid sales, another about a multiple sclerosis drug whose price had soared to $34,000 a vial — were only part of the troubles Mallinckrodt faced as the year began.
The stock of the drugmaker, whose United States headquarters are in St. Louis, was tanking. Wall Street worried that Medicare might reduce the half-billion dollars it was spending yearly on a Mallinckrodt drug with limited evidence of effectiveness.
