6 doctors weighed in:

Does cannabis interact with cumadin/warfarin? I know that alcohol heightens irn, does marijuana lower it?

6 doctors weighed in
Mike Moore
Family Medicine
3 doctors agree

In brief: Don't know...

We don't know, as far as i can tell it has not been studied.
I do know that smoking of any type, increases the risk of vascular events of the type we are generally trying to prevent with anti-coagulation with drugs like coumadin/warfarin. But as for directly affecting inr, we don't really know. Coumadin/warfarin is a dangerous drug with a narrow therapeutic window. I would advise caution.

In brief: Don't know...

We don't know, as far as i can tell it has not been studied.
I do know that smoking of any type, increases the risk of vascular events of the type we are generally trying to prevent with anti-coagulation with drugs like coumadin/warfarin. But as for directly affecting inr, we don't really know. Coumadin/warfarin is a dangerous drug with a narrow therapeutic window. I would advise caution.
Mike Moore
Mike Moore
Answer assisted by Mike Moore, Medical Student
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Dr. Kevin Passer
Pediatrics - Psychiatry
1 doctor agrees

In brief: Possibly

It's possible that some of the 60 different organic compounds contained in cannabis, could interfere with the metabolism of the medications you mentioned, thus either raising or lowering the blood levels of the drugs and subsequently affecting clotting and anti-coagulation.
Also, if you have a medical condition requiring coumadin, (warfarin) wouldn't it make sense to try and stay very healthy by not smoking?

In brief: Possibly

It's possible that some of the 60 different organic compounds contained in cannabis, could interfere with the metabolism of the medications you mentioned, thus either raising or lowering the blood levels of the drugs and subsequently affecting clotting and anti-coagulation.
Also, if you have a medical condition requiring coumadin, (warfarin) wouldn't it make sense to try and stay very healthy by not smoking?
Dr. Kevin Passer
Dr. Kevin Passer
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