Azinphos-ethyl (also spelled azinophos-ethyl) was a broad-spectrum organophosphate insecticide.
It is very toxic to mammals with a World Health Organization hazard classification as class IB, highly hazardous.[1] It is classified as an extremely hazardous substance in the United States as defined in Section 302 of the U.S. Emergency Planning and Community Right-to-Know Act (42 U.S.C. 11002), and is subject to strict reporting requirements by facilities which produce, store, or use it in significant quantities.[2]