Permethrin is toxic to lice
Symptoms of Lice
2 Of the 3 lice types, head lice get the most attention because they are thought to be highly prevalent
PERMETHRIN RESISTANCE in veterinary parasites: ticks, flies, lice, fleas, mites
Pediculosis is a prevalent parasitic infestation of humans, which is increasing due, in part, to the selection of lice resistant to either the pyrethrins or pyrethroid
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Malathion resistance was not observed in this study and it killed the permethrin-resistant head lice approximately 10 times faster than permethrin
1995;3:30-32
Crotamiton lotion or cream 10% We identified and determined the presence of the T917I kdr substitution in all 83 head lice collected (Table 1)
Compared to other nations, the frequency of permethrin resistance mutation in the head louse population in Saudi Arabia was low
Permethrin is the most common insecticide for treatment of human pediculosis, but nowadays resistance to permethrin and other pyrethroids has caused many treatment failures
Evidence for double resistance to permethrin Resistance
Conclusions: The presence of the T929I and L932F mutations was confirmed by DNA sequencing in lice collected from children in south Florida that were resistant to the pediculicidal effects of permethrin and the leading Topical treatment of pediculosis capitis (head lice infestation) in adults and children ≥2 months of age
To be most effective, retreatment should occur after all eggs have hatched but before new eggs are produced
Prescription drugs such as ivermectin may be needed in more difficult cases
Molecular analysis of kdr-like resistance in permethrin-resistant strains of head lice, Pediculus capitis
doi Permethrin resistance in head lice is mostly conferred by the kdr trait
The regimen is repeated after 5 days to coincide with the mites’ life cycle which requires 4 to 7 days for the mites to reach adulthood