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Abstract
hroids belong to most widely used synthetic insecticidal agents. They are structurally derived from the naturally occurring pyrethrin esters and are well known for their high insecticidal potency combined with low mammalian toxicity (Heder et al., 2001). Their role in the etiology of diseases related to the patients indoor environment remains to be elucidated. Generally, two types of pyrethroid insecticides leading to specific toxicity following high-dose exposure in mammals can be structurally differentiated into: Type I pyrethroids such as permethrin without a cyano group, which cause T syndrome (classified by tremor), and type II pyrethroids such as cypermethrin bearing a cyano group.