Permethrin is a common chemical, widely used as an insecticide.It belongs to the family of chemicals called pyrethroids and functions as a neurotoxin, affecting neuron membranes by slowing the access of important sodium ions.

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... PERMETHRIN (Nix® Creme Rinse) is used to treat head lice infestations. It acts by destroying both the lice and their eggs. Permethrin is also used to treat pubic lice. Generic permethrin lotion is available. ...
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Properties General Name 3-phenoxybenzyl (1RS)-cis,trans-3-(2,2-dichlo ...
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