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These are chemicals used to treat and control parasites that reside on, or in, the skin and coat of animals. They are a diverse set of products that can be applied in various ways. Some important terms must be discussed first before mentioning how each drug works.
'''Insecticides''' kill [[Insecta|insects]], whilst '''acaricides''' kill [[Arachnida|mites and ticks]].
'''Endectocides''' are active against both endo and ectoparasites. This are discussed on the antihelmintic pages.
'''Insect Growth Regulators''' don't kill adult stages but are able to prevent hatching, larval development or metamorphosis.
==Modes of Action==