Functions of Shampoo
     
         Depending on their functions, shampoos are used as cleaning agents for cosmetic purposes, antidandruff agents, antiseborrhoeic agents and keratolytic agents. [5]
As cleaning agents: these shampoos should be mild, effective, without causing irritation and should be used daily or on alternate days as needed. They remove dust and excess oil from the hair.
As antidandruff agents: these treat dandruff due to fungi like pityriasis versicolor. Rapidly relieves scaling and pruritis which are associated with fungal infections.
As antiseborrhoeic agents: they have cytostatic effect on cells of the epidermis and follicular epithelium, thus reducing corneocyte production.
As keratolytic agents: they remove ointment, pastes, which are used in the treatment of psoriasis. They also remove hard scales from the scalp