| Drug | Effect |
| Anticoagulants | |
| Alfalfa | Coumarin constituents |
| Angelica | Coumarin constituents |
| Aniseed | Coumarin constituents |
| Arnica | Coumarin constituents |
| Asafoetida | Coumarin constituents, anticoagulant in vivo |
| Celery | Coumarin constituents |
| Chamomile, German | Coumarin constituents |
| Chamomile, Roman | Coumarin constituents |
| Clove | Eugenol powerful inhibitor of platelet activity |
| Fenugreek | Coumarin constituents |
| Feverfew | Inhibits platelet aggregation |
| Fucus | Anticoagulant action |
| Garlic | Interaction with warfarin reported |
| Ginger | Inhibition of platelet activity |
| Ginseng, Panax | Reduction of blood coagulation |
| Horse-chestnut | Coumarin constituents |
| Horseradish | Peroxidase stimulates synthesis of arachidonic acid metabolites |
| Liquorice | Inhibition of platelet activity |
| Meadowsweet | Salicylate constituents |
| Poplar | Salicylate constituents |
| Prickly ash, northern | Coumarin constituents |
| Prickly ash, southern | Coumarin constituents |
| Quassia | Coumarin constituents |
| Red clover | Coumarin constituents |
| Willow | Salicylate constituents |
| Coagulants | |
| Agrimony | Coagulant, human |
| Goldenseal | Heparin antagonist |
| Mistletoe | Lectins, agglutinating activity |
| Yarrow | Coagulant, in vivo |
