Our expert says:
There should be no problem with omega 3 and 6 fatty acids and Centrum, but you are quite right to query as many drugs and foodstuffs can modify the effect of warfarin. To err on the side of safety, I suggest check your INR a week after starting the supplements.
Also remember it is changes that cause problems, so just as you should not take new drugs or foods without checking your INR, so also you should check your INR if you stop drugs or foods you have been taking.
Hopefully you will not need to take warfarin for very long especially as a new drug called dabigatran will soon be available in place of warfarin for some people. Its main problem at present is its very expensive, but the price should decrease by more than half within a few months
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