Shampoos that treat lice can be found in drug stores. Keep the shampoo away from the skin as much as possible. These shampoos will also come with a lice comb to remove the lice from the hair. Lice must also be removed from the home and other places the person infected may have been. Disinfect combs and brushes, wash all fabrics in hot water, and places other items that cannot get wet in the dryer on high heat to kill the lice that remain. Other items should be sealed in a plastic bag for at least two weeks to kill the lice.
There is no real prevention for head lice other than avoiding close contact with anyone who has a case of head lice. Do not share certain items such as brushes or hats.
American Academy of Dermatology Kids Health