Hospira ($HSP), whose shareholders agreed this week to a $15 billion buyout from Pfizer ($PFE), has yet another class I recall in the works. The Lake Forest, IL-based drugmaker is voluntarily recalling 181,704 bags of magnesium sulfate in 5% dextrose injections because labels on the immediate container may have barcodes indicating that it is instead the blood thinner heparin. Recall notice | More