It is an alpha-cyano (type II) pyrethroid
All pyrethroids have at least four stereoisomers, with different orientation of the substituents on the cyclopropane ring (or the equivalent part of the phenylacetate).
Toxicity of cypermethrin depends strongly on the ration of cis:trans isomers; cis isomers are biologically more active . Alpha-cypermethrin contains majority of the most active pair of the cis isomers of cypermethrin.
Toxicity of cypermethrin also vehicle-dependent ; Oral acute LD50 in rats, 250 (oily vehicle) to 5150 mg/kg (aqueous vehicle).
Following skin exposure, paraesthesiae generally start 30 . . .
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