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How does pyrethrin-piperonyl treat lice, crabs, and scabies?

Pyrethrin-piperonyl treats lice by killing the parasite responsible for infection. The medication interferes with the parasite's nervous system, resulting in its death. Pyrethrin-piperonyl is most effective when used in combination with self-care, including the thorough decontamination of the affected home, the affected school and personal items. Wash all clothes and bed linens in hot water and dry them on a hot cycle to kill both the parasites and their eggs.