Rozana shampoo offers a unique formula that combines medicinal efficacy with natural and safe remedies to eliminate lice and their eggs , use shampoo to eliminate lice and their eggs as well as small insects that infect the scalp , is also used to prevent infection in people who have contact with the infected person also its used to safely treat and prevent lice for all family members , provides protection against lice up to 12 hours after application, sprayer provides protection against lice up to 12 hours after application