Nizoral Anti-Dandruff Shampoo is used to treat and prevent dandruff. The shampoo contains ketoconazole, which is an antifungal that targets an increased number of yeasts on the skin called Malassezia. These yeasts occur naturally on everyone’s skin, however, people with dandruff seem to have more Malassezia. The shampoo also treats the inflammation associated with dandruff, relieving scalp redness and itching. This product is for use in adults and adolescents over 12 years.