I've read that you are supposed to only use nizoral only every 3-4 days because it can cause iritation to the scalp. Well, I ran out of my normal shampoo and had to use nizoral for 3 days in a row. Even since I have gotten my normal shampoo back I have continued to use nizoral almost every other day with NO iritation. Is this bad, good? Should go back to the normal routine or use as often as possible until it starts to bother me?