Coumaphos is a nonvolatile, fat-soluble phosphorothioate with ectoparasiticide properties: it kills insects and mites.

It is well known by a variety of brand names as a dip or wash, used on farm and domestic animals to control ticks, mites, flies and fleas.

[4] The compound has been linked to neurological problems in bees, and may be a factor in colony collapse.

[5] It is classified as an extremely hazardous substance in the United States as defined in Section 302 of the U.S.

§ 11002), and is subject to strict reporting requirements by facilities which produce, store, or use it in significant quantities.