What is the role of pediculicides in the treatment of pediculosis and pthiriasis (lice infestation)?

Updated: Mar 01, 2018
  • Author: Lyn C C Guenther, MD, FRCPC, FAAD; Chief Editor: Michael Stuart Bronze, MD  more...
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Not all treatment preparations are ovicidal. For weakly ovicidal or non-ovicidal pediculicides, routine retreatment is recommended typically 7-9 days after the first treatment. For strongly ovicidal pediculicides, retreatment is recommended only if live (ie, crawling) lice are still present after treatment. [4] Retreatment should ideally occur after all eggs have hatched but before new eggs are produced. [4] It is extremely important to use medications as directed to ensure total eradication of the lice through their life cycle. In addition, all infested persons in a household and their infested close contacts and bedmates should be treated at the same time.

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