Interaction between warfarin and astaxanthin: A case report.

This report explains the potential interaction between warfarin and astaxanthin in a 69-year-old Thai woman with history of ischemic stroke. Before taking astaxanthin, the patient used constant doses of warfarin, atenolol, digoxin, aspirin, omeprazole, and simvastatin concomitantly for 17 days without any signs and symptoms of adverse events. One day after astaxanthin was supplemented to her treatment regimen, ecchymosis was found on the right side of her groin and thigh.