Just wanted to mention that there is an interaction between CoQ10 and Warfarin (Coumadin).
Here's what's on Al Lodwick's site, which is a marvelous resource: warfarinfo.com
COENZYME Q10 INTERACTIONS WITH WARFARIN
Coenzyme Q10 has a chemical structure very close to that of vitamin K. There is an excellent review article covering interactions of alternative therapies and warfarin written by Amy Heck et al. in the July 1, 2000 edition of the American Journal of Health-System Pharmacy. In this article she cites four cases of interactions where coenzyme Q10 interfered with warfarin. Her conclusion is that until more is known about the effect of coenzyme Q10 and warfarin, patients should be advised to avoid the combination because of the possible risk of thrombotic (blood clotting) complications. If warfarin and Coenzyme Q10 are used together, the patient's INR should be monitored periodically within the first two weeks.
Reference: Heck AM et al. Potential Interactions Between Alternative Therapies and Warfarin. Am J Health-Syst Pharm 2000;57:1221-30.
The following was written by one of my students
Co-enzyme Q-10 is used to prevent cellular damage during myocardial ischemia and reperfusion and as a free radical scavenger (clinical studies do appear to support its usefulness in CHF and ischemic heart disease) 2 However, co-enzyme Q-10 is closely related in structure to vitamin K, and as such concurrent intake with warfarin may result in antagonism of warfarin?s anticoagulant effect. In rat studies, antagonism of Co-enzyme Q-10 had resulted in increased PT time. 1 There are a few case reports of interactions found in the literature.
Case reports:
3 patients on warfarin experienced a decreased INR after starting coenzyme Q-10, with a return to baseline after coenzyme Q-10 was discontinued.
68 year-old male treated with warfarin X 6 years for PE and CV emboli
72 year-old male treated for PE
70 year-old female treated for several years with warfarin
References:
1. Spigset O. Reduced effect of warfarin caused by ubidecarenone (letter). Lancet 1994; 344: 1372-1373.
2. Greenberg S, Frishman WH. Co-enzyme Q-10: a new drug for cardiovascular disease. J Clin Pharmacol 1990; 30: 596-608.
© 2001 Patricia Chuong
Back to interactions list Home
© 2000, 2001 Lodwick Creations, LLC
Contact Mr. Lodwick at:
[email protected]
Last modified April 1, 2001