Hello learningmeds. Mixing xanax with phenytoin, has its effects, and they are negative. The xanax will not work up to its full capacity in your body. The possibilty of what is called hydantoin toxicity exists. Some of these symptons are vomiting, slurred speech, being lethargic, tremors, along with nausea, vision, eyesight problems. You'll need to be very carefull when stopping the xanax. Your doctor might beable to better explain the potential interactions of these two drugs. best wishes to you.
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