Not all shamphoo are same to you may need to try this and that.There are many anti-dandruff shampoo in town but before you buy better search for shampoos which contains either Ketoconazole,Selenium sulfide,Salicylic acid and sulfur,Pyrithione zinc.For mild dandruff normal anti-dandruff shampoos might help but if its severe like say "seborrheic dermatitis" you need to consult doctor for this before using shampoos you will get the best prescription.if you are in india you can get Selsun Shampoo