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How old are you?
Since when have you had the itchy scalp?
What medicines or shampoos have you tried so far?
If Nizoral has not worked, it is likely that you do not have a simple dandruff but a condition known as Seborrhoeic dermatitis.
Please consult a dermatologist - you will need prescription strength medicines.
Your local doctor or FP will be able to refer you to a good dermatologist in your area.