Hi I am kunal, I have scalp dandruff on my head, previous I had used fongitar but now due to company has closed the production I couldn't get fongitar shampoo in the market, I have also read some articles on the internet. Actually Fongitar is combination of coal tar and ZPTO, but in the market we didn't get the alternative shampoo which has the same combination. So, my question is, is it possible to use two different shampoo simultaneously which has coal tar in one shampoo and other has ZPTO (Zinc pyrithione) like 8x shampoo and ionax t.