http://www.epa.gov/pesticides/factsheets/petproduct.htm

Not long ago there was a post about terrible reactions to spot-on type flea products.  I found this link on another site, apparently in the U.S. (elsewhere potentially I suppose) these products are being counterfeited and substandard and potentially dangerous substitutions are made in the ingredients.  I wonder if these counterfeit products are the cause of the horrible reactions being reported.

Stacey