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J Cutan Med Surg. 2000 Oct;4(4):199-201.

Clinical evidence of lice resistance to over-the-counter products.

Author information

1
Department of Medicine, Medical College of Ohio, Toledo, Ohio, USA.

Abstract

BACKGROUND:

Over-the-counter insecticidal solutions continue to be the mainstream treatment for most cases of head lice. Recorded insecticidal activity 15 years ago was at 100%, with ovicidal kill at 80%. Recently scattered accounts of possible resistance have surfaced.

OBJECTIVE:

This article is to document the general consensus that head lice are becoming resistant to standard over-the-counter therapies.

METHODS:

Direct testing of lethality of adult lice with permethrin and pyrethroid was assessed.

RESULTS:

Present over-the-counter products proved to be successful in only 9 of 32 head lice tested (28% insecticidal activity).

CONCLUSIONS:

Our series of cases further documents that over-the-counter head lice preparations no longer achieve high levels of insecticidal activity, suggesting increased resistance to these insecticides.

PMID:
11231198
DOI:
10.1177/120347540000400405
[Indexed for MEDLINE]

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