Recommended shampoos for seborrheic dermatitis

I used to suffer from seborrheic dermatitis, and the product I researched and purchased back then was Head & Shoulders Clinical Strength Advance Shampoo. It can only be bought through international direct shipping, so I waited a few weeks to receive it. As soon as I started using it, the itching on my scalp disappeared immediately. It took about a week for the dandruff to disappear as well. Since it is quite strong, they say you only need to use it 2-3 times a week.