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Drug Interactions With Phenytoin

Vitamin D
Phenytoin may make vitamin D less effective. People taking phenytoin may need extra vitamin D. Ask your healthcare provider if you need supplementation.
 
Warfarin
Warfarin and phenytoin may interact unpredictably, perhaps increasing or decreasing the risk of bleeding. This combination may also increase the risk of phenytoin side effects. Check with your healthcare provider before taking these medications together, changing your dosage of either of these medications, or stopping either of these medications (if you had been taking them together).
 

Final Thoughts on Drug Interactions With Phenytoin

It is possible that not all phenytoin drug interactions were discussed in this article. Therefore, you should talk with your pharmacist or healthcare provider about any specific drug interactions with phenytoin that may apply to you. Because so many medications interact with phenytoin, it is a good idea to let your healthcare provider know anytime you start, stop, or change your dose of any medication (including nonprescription medications) during treatment with phenytoin.
 
 
Know the Signs - Concussion Safety

Phenytoin Sodium

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