Flaxseed Oil and Warfarin

People use flaxseed oil for a variety of conditions including: arthritis, cancer, anxiety, dry eyes and prevention of heart attacks. The use of flaxseed and flaxseed oil for medicinal use has not been regulated by the Food and Drug Association.

Patients on warfarin need to pay special attention when using flaxseed products as an increase in INR may result. Flaxseed and flaxseed oil has shown a propensity to decrease platelet aggregation and therefore increase bleeding time.1

Flaxseed and flaxseed oil is used primarily as a food additive, in cooking oil and in margarines. Additionally, flaxseed oil is a component in paint, varnishes, linoleum, soap and a waterproofing agent.2

Patients are recommended to speak with their healthcare professional before starting or stopping flaxseed products. 

  1. Prasad, K. Flaxseed and Cardiovascular Health. Journal of Cardiovascular Pharmacology: . November 2009. vol 54, issue 5. 369-377.
  2. Jellin, F. Natural Medicines Comprehensive Database. 2005. 1268.