This year, I got dandruff for the first time when the weather turned cold. Luckily, the first shampoo I tried did the trick and it hasn’t been a problem at all. I use Neutrogena Daily Control shampoo with conditioner. The first time I used it, there was no improvement. The second time, the dandruff actually seemed worse and I almost gave up on it. The third time, however, cleared it up completely. Now I use my regular shampoo and conditioner most days but use the Neutrogena two or three times a week. No itching, no flakes.
I don’t think it’s the best shampoo as far as styling goes, but if I also use a leave-in conditioner (the one I have now is by Aveeno), my hair is at least manageable (I have a lot of long hair!). The scent of the shampoo isn’t bad, and the cost is reasonable considering I don’t use the shampoo every day. In fact, I’m only on my second bottle since October.
Good luck, and I hope you find something that works for you!