Table 1

Score awarded to drugs, according to the evidence and impact of interaction with warfarin

Enhancement, +1
Enhancement, +2

acetaminophen
alcohol
acetylsalicylic acid
amiodarone
amoxicillin/clavulanate
anabolic steroids
azithromycin
cimetidine
celecoxib
ciprofloxacin
chloral hydrate
clofibrate
citalopram
cotrimoxazole
clarithromycin
entacapone
dextropropoxyphene
erythromycin
disulfiram
fenofibrate
diltiazem
fluconazole
fluorouracil
fluoxetine
fluvastatin
isoniazid
fluvoxamine
metronidazole
gemcitabine
miconazole
interferon
phenylbutazone
itraconazole
piroxicam
levamisole/fluorouracil
propafenone
levofloxacin
sulfinpyrazone
omeprazole
sulfamethoxazole-
paclitaxel
trimetoprim
phenytoin
tamoxifen
propranolol
thyroid hormone
quinidine
voriconazole
ropinirole
zileuton
sertraline

simvastatin

tetracycline

tolterodine

tramadol


Inhibition, -1
Inhibition, -2

azathioprine
antithyroid drugs
chlordiazepoxide
barbiturates
dicloxacillin
bosentan
raloxifene
carbamazepine
ribavirin
cholestyramine
ritonavir
dichloralphenazone
sucralfate
griseofulvin

mercaptopurine

mesalamine

nafcillin

rifampin

Schulman et al. Thrombosis Journal 2008 6:15   doi:10.1186/1477-9560-6-15