I don't know if this is any help, but I just stumbled across it and remembered your post.
What drug(s) may interact with warfarin?
Warfarin interacts with many other medicines; some are listed below:
•agents that dissolve blood clots
•agents that lower cholesterol
•alcohol
•allopurinol
•amiodarone
•antibiotics or medicines for treating bacterial, fungal or viral infections
•antiinflammatory drugs, NSAIDs, such as ibuprofen
•aprepitant
•aspirin, acetaminophen (Tylenol®)
•azathioprine
•barbiturate medicines for inducing sleep or treating seizures
•bosentan
•cimetidine
•cyclosporine
•disulfiram
•female hormones, including contraceptive or birth control pills
•fish oil (omega-3 fatty acids) supplements
•herbal products such as danshen, garlic, ginkgo, ginseng, green tea, or kava kava
•influenza virus vaccine
•male hormones
•medicines for some types of cancer
•certain medicines for heart rhythm problems
•certain medicines for high blood pressure
•quinidine, quinine
•seizure or epilepsy medicine such as carbamazepine, phenytoin, and valproic acid
•testolactone
•thyroid medicine
•tolterodine
•vitamin K (including vitamin, mineral, and food supplements that contain vitamin K)
Source: www.drugdigest.org