Observed herb/drug interactions associated with Dang Gui, Dong Quai, Tang-Kuei (Angelica sinensis). [Source]

Patient Abstract Herb and Use Drug Believed to Interact Other Drugs Being Taken Medical Observation Mechanism Legitimacy
46 year old woman with history of stroke, rheumatic heart disease and atrial fibrillation [44] Dong quai Angelica sinensis (Gynaecological conditions) Warfarin Digoxin, frusemide ↑ INR Herb acts as Cox inhibitor Likely
Woman with history of mitral valve replacement [45] Dong quai Angelica sinensis (Gynaecological conditions) Warfarin None stated INR = 10, widespread bruising Herb acts as Cox inhibitor Possible