A Parent Has Been Instructed to Apply a Combination Product

A parent has been instructed to apply a combination product of pyrethrins with piperonyl butoxide [RID] to treat head lice in a child. The parent asks the nurse why it is necessary to repeat the application in 9 days. The nurse will respond by telling the parent that:

A) a second treatment helps combat medication resistance.
B) the dose needed to kill lice is too toxic to use all at once.
C) the combination is active only against adult lice and not ova.
D) the second dose helps rid the hair of nits and ova.

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