Drug General Information (ID: DDIJ7TZ80X)
Drug Name			Nabumetone		Drug Info		Warfarin		Drug Info
Drug Type		Small molecule				Small molecule
Therapeutic Class		Nsaids/Analgesics				Anticoagulants
Structure

Mechanism of Nabumetone-Warfarin Interaction (Severity Level: Major)
Increased risk of bleeding Click to Show/Hide Mechanism Graph
Drug Name		Nabumetone				Warfarin
Mechanism		Risk of bleeding Antiplatelet effects				Risk of bleeding Anticoagulant
Key Mechanism Factor 1
		Factor Name		Bleeding
		Factor Description		Patients may be at risk for bleeding when the outcome of a disease or disease treatment confounds the standard mechanisms for maintaining hemostasis. Signs or symptoms of abnormal bleeding include: bleeding that takes a long time to stop (including nosebleeds, bleeding gums, bleeding from cuts and abrasions, and menstrual bleeding); severe unexplained bruising, or bruising that becomes larger; blood in the urine or stool, etc.
Mechanism Description		Increased risk of bleeding by the combination of Nabumetone and Warfarin

Recommended Action
Management		NSAIDs should be administered with oral anticoagulants only if benefit outweighs risk. The INR should be checked frequently and oral anticoagulant dosage adjusted accordingly, particularly following initiation or discontinuation of NSAIDs in patients who are stabilized on their anticoagulant regimen. Patients should be advised to promptly report any signs of unusual bleeding or bruising to their physician, including pain, swelling, headache, dizziness, weakness, prolonged bleeding from cuts, increased menstrual flow, vaginal bleeding, nosebleeds, bleeding of gums from brushing, red or brown urine, or red or black stools. Salicylates (except aspirin) appear to have less effect on coagulation and may be preferable in patients treated with oral anticoagulants.

References
1	Penning-van Beest F, Erkens J, Petersen KU, Koelz HR, Herings R "Main comedications associated with major bleeding during anticoagulant therapy with coumarins." Eur J Clin Pharmacol 61 (2005): 439-44. [PMID: 15947920]
2	Loftin JP, Vesell ES "Interaction between sulindac and warfarin: different results in normal subjects and in an unusual patient with a potassium-losing renal tubular defect." J Clin Pharmacol 19 (1979): 733-42.[PMID: 536470]
3	Gabb GM "Fatal outcome of interaction between warfarin and a non-steroidal anti-inflammatory drug." Med J Aust 164 (1996): 700-1.[PMID: 8657040]