Pyrethroids are found in more than 3,500 products used inside homes and on crops, yards, and gardens - including lice shampoos, indoor foggers, fleasprays for pets and pesticides to fight ants, wasps, mosquitoes, aphids and spiders.
As part of the total flea eradication effort, you should also wash all pet bedding and spray any outdoor patio or garden areas that your pets frequent.