candidemia
"Diflucan can change the serum level of Dilantin. In my father's case, it drove his Dilantin level to toxic levels within a matter of days (it reached 32; the normal threshold for seizure protection is a level between 10 and 20). His infectious disease specialist knew that he was on Dilantin (for a brain tumor) but did not warn us of a possible interaction. It took us a while to "even things out" afterward."