Basic features It is used against pityriasis, dandruff, and seborrheic dermatitis. Contains 2% ketoconazole which is known for its antifungal properties. A suitable choice for someone with dandruff. Overview Instructions for use: Shake the shampoo well before use. Shampoo twice a week for a month. Then once a week for a month. Then once every two weeks if necessary. Leave the shampoo for ten minutes on the head, then rinse it with clean water