Some natural substances have blood-thinning properties. A possible risk exists when taking such a product while also taking Coumarins (coumadin-like substances), salicylates (aspirin-like substances) and anti-platelets (substances that prevent blood cells from clumping together) as these are all considered blood thinners. Too much blood thinning can lead to excessive bleeding.
*Herbs containing coumadin: angelica root, arnica flower,anise, asafoetida,celery,chamomile,fenugreek,horse chestnut,licorice root,lovage root,parsley,passionflower herb,quassia. red clover
rue,sweet clover
*Herbs thought to contain salicylates: Meadowsweet,poplar,willow bark*Herbs with Anti-platelet properties: bromelain,clove,onion, and turmeric
There are no documented reports of a proven interaction between Coumadin and any of these herbs. However, patients taking these herbs while on Coumadin should be closely watched for signs of bleeding. Herbs that potentiall can increase bleeding time should be stopped at least 2 weeks before surgery and not be taken until approval of the treating physician.
Nearly all available information on herb-Coumadin interactions is based on lab studies, animal studies, or individual case reports. Cause and effect relationships have not been proven. Available reports give limited information about the severity of these interactions. There is little reliable information about the safety and effectiveness of most herbal products. There are no regulations governing purity and potency of herbal products during manufacturing.
== Bleeding Risk ==