Dandruff

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Hi... I had my HT surgery 4 months ago... I have noticed new growth... I am also using minoxidil as per instructions. But i have developed dandruff in my hair. I have had dandruff problem before HT surgery. I am using ketoconazole every 3rd day but it isn't helping with the dandruff. Prior to HT surgery i used to use it on a daily basis which controlled my dandruff. Now I am afraid if i use it daily it might overdry my skinand may damage my new growth. Also I am wondering whether the dandruff is due to minoxidil which I am using twice daily and if it is so what would happen if i stop using it.
Thirdly I have bought an anti dandruff hair tonic containing Climazol for dryness after shampoo but I am afraid to use it thinking it may damage the hair growth if used daily.
Sorry for the long post but I am very confused... Kindly help