Is Ketoconazole Good For A Two Year Old Rottweiler Male

is ketoconazole good for a two year old rottweiler male pure bred who has a little irratated red spot in rite ear flap my vet gave me a scrip for 45 pills take 1 n a half daily ,before that mometavet wasadministered by me now his ear is still irratated this has been going on way to long a year,im not happy with my vet