Can I treat my 4-year-old child with malathion to get rid of his head lice?

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You should not treat your 4-year-old's head lice with malathion (Ovide) unless your doctor tells you to. Malathion is a prescription medication that's approved for children who are at least 6 years old, and it hasn't been tested in younger kids. Your doctor can tell you other ways to get rid of your child's head lice.