Parasidose Shampoo kills head and body lice and their eggs this Extra strength, double Shampoo treatment is suitable for the whole family. The trick to treating headlice is to make sure you kill not only the lice but get rid of the eggs, It is important to keep treating them until they are gone to prevent re infestation. We recommend treaming up a Shampoo with a lice comb to make sure you rid your head of any nasty nits and their eggs.