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Here is a short list of medications that will actually prevent a patient from being anticoagulated by coumadin. These medications will make it difficult for the patient to reach therapeutic levels and need to be warned about this drug-drug interaction with coumadin:
- Antacids
- Antihistamines
- Barbituates
- Carbamazepine
- Cholestyramine
- Corticosteroids
- Griseofulvin
- OCPs
- Phenytoin
- Rifampin
- Vitamin K
Reference: Goldfrank's Textbook of Toxicologic Emergencies, 6th Edition