I bought some "Head and Shoulders Intensive Treatment" from ASDA by pure luck and it fixed my dandruff in a few weeks. When the bottle ran out and I bought a different version of Head and Shoulders it came back. The Intensive Treatment one seems to have an ingredient called Selenium Sulphide that does the trick. http://www.nhs.uk/Medicine-Guides/pages/MedicineOverview.aspx?medicine=Selenium sulphide.

Vagisil!![]()
specialist told me to use head and shoulders but had some pretty bad itching going on as well think it was a yeast problem or something ! anyway he said there was something in head and shoulders that made it better than the others (this was late 80s or early 90s iirc)
Coal Tar shampoo proper thick strange smelling stuff, but is pretty good.