I'm struggling with dandruff i have used medicated shampoos but they not helping. what can i do?

Controlling dandruff: Dandruff (seborrhea) is common. Shampoos with zinc, salicylic acid, selenium, or coal tar are sold in many stores. Nizoral (ketoconazole) shampoo (anti-fungal) is also available. Prevent dryness (don't wash hair too often). A primary doctor or dermatologist can look for psoriasis, eczema, or fungal infections if unusual or worrisome scalp symptoms. Common brands are Head-and-Shoulders, etc...