As a synthetic insecticide, permethrin is found in many spray on insect protection products. Check with your local hardware store or drug store for such products.
Permethrin will kill crickets that are in the area where it is sprayed. It does not keep crickets from coming back to that area though.
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You can buy permethrin over the counter at a %1 strength which is strong enough to kill lice but the kind of permethrin (%5 strength) that cures scabies you need a prescription for
Permethrin does kill yellow jackets as well as hornets, ground bees, wasps, and other stinging insects. You can discourage yellow jackets from nesting in trees and shrubbery around your yard by spraying them with permethrin as well.
Permethrin cream is used to treat scabies also known as Norwegian scabies. Scabies is an contagious skin infection caused by mites.
Permethrin is safe for children so long as it is sufficiently attached to the clothing it's applied to. Once this is the case it is unlikely to be absorbed.
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Ovide, a newer medication containing malathion, appears to be effective in treating patients with permethrin-resistant lice.
Permethrin is considered preferable for head lice because lindane is absorbed through the skin and may produce symptoms of neurotoxicity.