A nurse told me to slather my daughter's head in mayonnaise before bed and then cover it with a shower cap secured with hair elastics. From the Dollar Store, this treatment was $2 and I had a pile of leftover shower caps for the next time. In the morning, we got in the shower and the dead bugs poured out of her hair. Sheets and towels washed it hot water and we were good to go. This works because the mayo suffocates them. They can only hold their breath for like an hour. After that, they die.
Many drugs such as Nix ect but this ones seems to do the job still with one application. If you have any kids that come home with lice, try this first and see what happens instead of buying those expensive products that you still have to pick them out.