Drugs diminishing the effect of warfarin: Acetamenaphthone, alcohol (chronic ingestion w/o liver impairment), aminoglutethimide, barbiturates, carbamazepine, dichloralphenazone, ethchlorvynol, glutethimide, griseofulvin, nafcillin, phytomenadione, rifampicin. Drugs enhancing the effect of warfarin: Alcohol (acute or chronic ingestion), allopurinol, amiodarone, aspirin, cefamandole, chloramphenicol, cimetidine, clofibrate, chloral hydrate, co-trimoxazole, danazol, dextropropoxyphene, dextrothyroxine, dipyridamole, disulfiram, erythromycin, ethacrynic acid, ethylestrenol, fluconazole, glucagon, itraconazole, ketoconazole, metronidazole, miconazole, norethandrolone, NSAIDs, oxymetholone, quinidine, stanozolol, sulfinpyrazone, tamoxifen, thyroid agents, tienilic acid, triclofos Na.
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