Head lice are becoming resistant to permethrin (Nix)
November 1999
A new Harvard study shows what many frustrated parents and physicians have long suspected...
Head lice are becoming resistant to permethrin (Nix)...and probably OTC pyrethrins such as R&C, Para Special, Licetrol, etc.
In spite of this bad news, OTC lice treatments are still appropriate for INITIAL therapy.
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