I saw this on the People's Pharmacy.
Possible Interactions:
A recent case report warns of the dangers of cinnamon interacting with oral anticoagulants (European Journal of Case Reports in Internal Medicine, online July 19, 2019). An 80-year-old man who had been taking dabigatran (Pradaxa) for atrial fibrillation started taking a solution of cinnamon and ginger. Three days later he was vomiting blood and his stool was black with blood. The doctors were unable to control his intestinal bleeding and he died. There may be other factors that contributed to this tragedy. However, to be prudent, people taking anticoagulant medicines should not use cinnamon as medicine.