Davis v. McKesson Corporation

Davis, Munnuru, and Fischer (plaintiffs) developed symptoms after exposure to a gadolinium-based contrast agent (GBCA) used in MRI scans and sued McKesson and other manufacturers (defendants) in consolidated litigation; none of the claimants' four designated experts could testify that GBCA was capable of causing the range of symptoms they experienced, and no regulatory or medical authority had found sufficient evidence that GBCA causes disease. The manufacturers moved for summary judgment for lack of general causation, while the claimants argued their treating physicians' differential diagnoses (ruling out other causes) sufficiently established causation.