Treats and prevents Dandruff and seborrhoeic dermatitis. Benefits: Treats and prevents Dandruff and seborrhoeic dermatitis. Relieves scalp dryness, flaking, redness and itching. Nizoral Dandruff Shampoo not only treats and prevents dandruff and seborrhoeic dermatitis but also the associated inflammation, relieving scalp redness and itching. Its targeted action specifically treats the underlying cause of dandruff, yet it is pleasantly gentle to your hair.