Phenytoin vs Vitamin K Antagonists (eg, warfarin)

Interacting Drugs
Phenytoin
vs
Vitamin K Antagonists (eg, warfarin)
Security Level
Moderate, Consider therapy modification
Mechanism
Vitamin K Antagonists (eg, warfarin): Phenytoin may enhance the anticoagulant effect of Vitamin K Antagonists. Vitamin K Antagonists may increase the serum concentration of Phenytoin.
Management
Anticoagulant dose adjustment will likely be necessary when phenytoin is initiated or discontinued. Monitor patients extra closely (INR and signs/symptoms of bleeding) when using this combination.

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Other Interactions of Phenytoin

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Other Interactions of Vitamin K Antagonists (eg, warfarin)

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