Lindane 1% shampoo, lotion (None ... Repeat in 7 days. Kills head lice by asphyxiation; contains no neurotoxic pesticide. Malathion 5% lotion (Ovide) Apply to dry hair, leave on 8–12 hours ...

When Jennifer McClelland learned that her five-year-old son’s best buddy had lice ... For instance, lindane—which is usually only used as a second-line treatment after others have failed ...