Used primarily as an organophosphate insecticide in veterinary and agricultural settings, it controls external parasites such as flies, lice, and mites on livestock and in poultry houses. Commonly applied in formulations for dipping, spraying, or dusting animals, it is effective in managing ectoparasite infestations in cattle, sheep, and pigs. Also used in aquaculture to treat sea lice on farmed fish, particularly in salmon production. Its mode of action involves inhibiting acetylcholinesterase in insects, leading to nervous system disruption and death. Due to environmental and toxicity concerns, its use is regulated in many regions, especially in outdoor agricultural applications.