Which herb commonly interacts with anticoagulants and antiplatelet medications?

• A. Cynara scolymus (Artichoke)
• B. Ephedra sinica (Ephedra)
• C. Echinacea angustifolia/pallida/purpurea (Echinacea)
• D. Curcuma longa (Turmeric)

Answer: (D)

Some herbs carry antiplatelet or anticoagulant effects that can amplify bleeding risk when used with blood thinners. Turmeric is one of these. The active constituent curcumin inhibits platelet aggregation and can influence coagulation pathways, which may prolong bleeding time. It can also interact pharmacokinetically by affecting liver enzymes that metabolize anticoagulants, potentially increasing their levels. This combination of herbal antiplatelet activity and possible impact on anticoagulant metabolism makes turmeric more likely to interact with anticoagulants and antiplatelet medications, elevating bleeding risk. The other herbs listed do not have as well-established or direct bleeding-risk interactions with these drugs.