A contact and fumigant organophosphorous insecticide. Available commercially as concentrated emulsions, used therapeutically both as an external insecticide and as an anthelminthic.
For etiology, clinical features, lesions, treatment and investigations, see Organophosporous compounds

[toxic.gif] Toxicity
Oral doses in mg/kg or concentrations in mg/l:
LD50 rats 25-80
  chickens 15
  ducks 2-7.8
  pheasants 9
  dogs 100-300
MTD calves 10
  sheep 25
  cattle 25
  horses 25
LC50 (48 h) fish 0.7

Note: local allergic (skin) reactions have been well documented in cats and dogs wearing insecticidal flea collars.