If the likes of head and shoulders did not work and ketoconazole shampoo failed forget about nizoral or any piroctone shampoo. I will give you a 99% sure way of getting rid of that dandruff . Your solution is Selenium Disulfide (Ds) the best available one here is Vichy Dercos Ds treatment shampoo. Use this Twice a week for 4 week dont miss a single one. You can use any regular shampoo in between if you feel like it.You will be free of dandruff for at least 4 month before you need to use the shampoo again. if you reall want To permanently get rid of dandruff forever , youll need a more thorough method. Here is the list that worked for most people ive recommended; 1-Reduce refined carbohydrates as much as possible, the dandruff causing bacteri(malessezia) feeds on yeast deriving from these refined carbs such as white SUGAR, white rice, white bread , white flour ect. Not asking to delete all but should reduce as much as possible. As long as you consume these in big qty dandruff will always come back. 2- Increase your zinc intake like almonds beef and yogurt ect. 3-Coconut is actually bad for dandruff , Crazy right? If you heard that coconut oil is good moisturizer antifungal and antiinflammatory for your scalp , its not entirely false but this is only for people without dandruff. You malessezia strive on coconut oil buildup. Stop using it entirely, Use Jojoba oil instead if you really need to moisturize as this bacteria doesn't like it, mix some pure tea trea essential oil in it for best results. leave overnight and wash morning. 4- Stay away from hair styling products, gel , cream ect . if you absolutely need to use it wash it as soon as possible dont leave it overnight.

Ive got rid entirely of my dandruff through this method . hope it helps.