As is true of any pediculicide pyrethroids do not remove the eggs from the hair

As is true of any pediculicide pyrethroids do not

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As is true of any pediculicide, pyrethroids do not remove the eggs from the hair. Some physicians treat apparently resistant infestations with a prescription-strength pyrethroid (3 - 5%) preparation normally meant for treating scabies infestations. In our recently published article we report that some head lice in the United States are resistant to permethrin, and that higher doses of this insecticide generally were not more effective. Thus, prescription-strength pyrethroids are not likely to be effective. Although permethrin and pyrethrins differ in chemical structure, their mode of action is quite similar. Thus, we would anticipate that pyrethrins would also be ineffective in killing permethrin-resistant lice. Non-pyrethroid insecticides Other insecticides should be avoided unless specifically prescribed by a physician. The organochlorine insecticide lindane , and the organophosphate insecticide malathion are two of the active agents within pediculicides available by prescription. The current susceptibility of these insects to lindane or malathion has not yet been analyzed in the United States. Prescription preparations containing these insecticides may be considered as alternative pediculicides if live lice persist after two treatments with pyrethroid-based pediculicides. Use caution when dealing with any insecticidal agent, particularly on children. Read and follow label directions. Do not apply any insecticide or other chemical not specifically labeled for use on people. Well-intentioned parents treating their children with toxic or flammable substances have caused several deaths and poisonings.
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Essential oils Numerous "home recipes" and commercial preparations are based on mixtures of essential oils, salts or other "natural" substances. Data is lacking to support the claims of their efficacy. Enzyme treatments The chemical structure of the "cement" that binds the egg to the hair is not well-defined. Nonetheless, it is an exceptionally stable substance that resists degradation by diverse chemicals. Several commercial products are advertised to "dissolve" the eggs or the cement by which the eggs are attached to the hair. Antibiotics The guts of human lice contain a specialized organ that harbors an unusual type of bacteria. These bacteria may aid the louse in digesting the blood meal or by providing essential nutrients. Certain antibiotics may affect or eliminate these bacteria from the louse's gut, and body lice that have fed upon antibiotic-laden blood of people may be burdened and die. The effect of antibiotics on the health of head lice has yet to be determined conclusively. Physicians increasingly seem to prescribe combinations of the antibiotic agents trimethoprim and sulfamethoxazole (e.g. "Bactrim", 'septra") in attempts to treat head lice. We oppose this practice because these antibiotics are not approved as pediculicides, and they are valuable in fighting life-threatening infections. Their use for treating such a relatively
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  • Summer '14
  • Head louse, Facial hair, Pediculosis, Body louse, Crab louse, Louse

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