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Home > Departments (Clinics) > Anticoagulation Clinic > Drug Interactions

Drugs Which Interfere with Coumadin® Regulation

Increased Warfarin Effect


Highly Probable
  • Alcohol (if concomitant liver disease)
  • Amiodarone
  • Cimetadine
  • Clofibrate
  • Cotrimoxazole
  • Erythromycin
  • Fluconazole
  • Isoniazid
  • Metronidazole
  • Miconazole
  • Omeprazole
  • Phenylbutazone
  • Piroxicam
  • Propafenone
  • Propanolo
  • Sulfinpyrazone Probable
  • Acetaminophen (Tylenol®)
  • Anabolic steroids
  • Aspirin
  • Chloral Hydrate
  • Ciprofloxacin
  • Dextropropoxyphen
  • Disulriam
  • Quinidine
  • Phenytoin (Dilantin®)
  • Simvastatin
  • Tamoxifen
  • Tetracycline
  • Influenza vaccine Possible
  • Disopyramide
  • 5-Fluorouracil
  • Ifosphamide
  • Lovastatin
  • Metolazone
  • Nalidixic Acid
  • Norfloxacin
  • Ofloxacin
  • Cefamandole
  • Cefazolin
  • Gemfibrozil
  • Heparin
  • Indomethacin
  • Sulfisoxazole

Decreased Warfarin Effect


Highly Probable
  • Barbiturates
  • Carbamazepine
  • Chlorodiazepoxide
  • Cholestyramine
  • Griseofulvin
  • Nafcillin
  • Rifampin
  • Sucralfate Probable
  • Dicloxacillin Possible
  • Azathioprine
  • Cyclosporine
  • Etrelinate
  • Trazodone

No Warfarin Effect


Highly Probable
  • Antacids
  • Atenolol
  • Bumetanide
  • Diflunisal
  • Enoxacin
  • Famotidine
  • Felodipine
  • Fluoxetine
  • Ketorolac
  • Metoprolol
  • Moricizine
  • Naproxen
  • Nitrazepam
  • Nizatidine
  • Psyllium
  • Ranitidine probable
  • Ibuprofen
  • Ketoconazole
  • Ketoprofen doubtful
  • Diltiazem
  • Tobacco
  • Vancomycin


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