Warfarin
- TRADE NAMES: Aldocumar; Coumadin (Bristol-Myers Squibb); Coumadine; Marevan; Waran; Warfilone
- INDICATIONS: Thromboembolic disease, pulmonary embolism
- CLASS: Anticoagulant, Coumarin
- HALF-LIFE: 1.5–2.5 days (highly variable)
Acemetacin, Amiodarone, Amobarbital, Amprenavir, Antithyroid agents, Aprepitant, Aprobarbital, Aspirin, Atazanavir, Atorvastatin, Azathioprine, Azithromycin, Barbiturates, Beclomethasone, Betamethasone, Bezafibrate, Bismuth, Bivalirudin, Boceprevir, Bosentan, Butabarbital, Capecitabine, Cefixime, Celecoxib, Ceritinib, Chondroitin, Cimetidine, Ciprofloxacin, Clarithromycin, Clofibrate, Clopidogrel, Clorazepate, Co-Trimoxazole, Cobicistat/Elvitegravir/Emtricitabine/Tenofovir Alafenamide, Cobicistat/Elvitegravir/Emtricitabine/Tenofovir Disoproxil, Colesevelam, Cyclosporine, Danazol, Daptomycin, Darunavir, Dasiglucagon, Delavirdine, Desvenlafaxine, Dexamethasone, Dexibuprofen, Dexlansoprazole, Diclofenac, Dicloxacillin, Dirithromycin, Disulfiram, Dronedarone, Duloxetine, Econazole, Efavirenz, Enzalutamide, Ergotamine, Erlotinib, Erythromycin, Eslicarbazepine, Etoricoxib, Exenatide, Fenofibrate, Fluconazole, Flunisolide, Fluoxymesterone, Fosamprenavir, Gefitinib, Gemfibrozil, Glucagon, Grapefruit Juice, Heparin, Imatinib, Influenza Vaccine, Inotersen, Itraconazole, Ketoconazole, Leflunomide, Lepirudin, Letermovir, Levofloxacin, Levothyroxine, Liothyronine, Liraglutide, Lomitapide, Lopinavir, Menadione, Mephobarbital, Methimazole, Methyl salicylate, Methylprednisolone, Methyltestosterone, Metronidazole, Miconazole, Mifepristone, Moricizine, Moxifloxacin, Nafcillin, Nalidixic Acid, Nandrolone, Nilutamide, Norfloxacin, Obeticholic Acid, Ofloxacin, Omeprazole, Oritavancin, Orlistat, Pantoprazole, PEG-Interferon, Penicillin G, Penicillin V, Penicillins, Pentobarbital, Phenobarbital, Phenylbutazones, Phytonadione, Piperacillin, Piroxicam, Prasugrel, Primidone, Propoxyphene, Propranolol, Propylthiouracil, Quinidine, Quinine, Rabeprazole, Resveratrol, Rifampin, Rifapentine, Rofecoxib, Romidepsin, Ropinirole, Rosuvastatin, Roxithromycin, Salicylates, Secobarbital, Simvastatin, Sitaxentan, Sorafenib, St John's Wort, Stanozolol, Sulfamethoxazole, Sulfinpyrazone, Sulfisoxazole, Sulfonamides, Sulindac, Tamsulosin, Tegafur/Gimeracil/Oteracil, Telaprevir, Telithromycin, Teriflunomide, Testosterone, Tibolone, Tigecycline, Tinidazole, Tolmetin, Tolterodine, Triamcinolone, Troleandomycin, Uracil/Tegafur, Valdecoxib, Vemurafenib, Venlafaxine, Vilazodone, Vitamin A, Vitamin E, Zafirlukast, Zileuton
PREGNANCY CATEGORY: X
category D for women with mechanical heart valves
Alternative remedies, including herbals, may potentially increase the risk of bleeding or potentiate the effects of warfarin therapy. Some of these include the following: angelica root, arnica flower, anise, asafetida, bogbean, borage seed oil, bromelain, dan-shen, devil’s claw, fenugreek, feverfew, garlic, ginger, ginkgo biloba, ginseng, horse chestnut, lovage root, meadowsweet, onion, parsley, passionflower herb, poplar, quassia, red clover, rue, turmeric and willow bark
See full prescribing information for complete boxed warning.
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Page last updated 07/31/2023
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Incidence 
- <1%
- 1-5%
- 5-10%
- 10-15%
- 15-20%
- 20-30%
- >30%
Warnings in other populations 
- Breast feeding
- Geriatric
- Pediatric