Chlorpyrifos is a thiophosphate insecticide and acaricide sold under such names as Lorsban and Dursban. Dow Chemical first marketed it in 1965 as a household pesticide. Because chlorpyrifos is associated with several health problems, in 2001 FDA severely restricted its use , but it is still widely used in some countries. More recently, researchers found that it affects several regions of the brain.
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