Chlorpyrifos : CAS#: 2921-88-2

This fact sheet answers the most frequently asked health questions about chlorpyrifos. For more information, you may call the ATSDR Information Center at 1-888-422-8737. This fact sheet is one in a series of summaries about hazardous substances and their health effects. This information is important because this substance may harm you. The effects of exposure to any hazardous substance depend on the dose, the duration, how you are exposed, personal traits and habits, and whether other chemicals are present.Chlorpyrifos is an insecticide which has been widely used in homes and on farms. Breathing or ingesting chlorpyrifos may result in a variety of nervous system effects, ranging from headaches, blurred vision, and salivation to seizures, coma, and death, depending on the amount and length of exposure. Chlorpyrifos has been found in at least 7 or the 1,430 National Priorities List sites identified by the Environmental Protection Agency (EPA).tfacts84.pdf199