(Higher concentrations of permethrin are used in medications for treating both head lice and scabies.) Spray only your clothing. We said it before, but it’s worth repeating: Permethrin spray is ...

Some medical practitioners recommend pesticide treatments containing permethrin, pyrethrin, or malathion. These therapies have been the first line of treatment for head lice since World War II.

Head lice affect more than 100 million people worldwide annually. Permethrin (1% formulation) is efficacious but resistance is emerging. Malathion (0.5% formulation) is an alternative, but ...