The following herbs may increase the effects of warfarin:

1. chi shao,

2. chong wei zi,

3. chuan niu xi,

4. chuan shan jia,

5. chuan xiong,

6. dan shen,

7. dang gui,  

8. e zhu,

9. gan qi,

10. garlic,

11. ginseng,

12. ginkgo (bai guo, yin guo, yin xing),

13. hong hua,

14. hu zhang, huang qin,  

15. ji xue teng

16. jiang huang,  

17. hong hua,  

18. hu zhang ,   

19. liu ji nu

20. lu lu tong,

21. ru xiang,

22. san leng,

23. shui zhi

24. si gua luo, 

25. su mu,

26. tao ren,  

27. tu bie chong,

28. wa leng zi, 

29. wang bu liu xing,  

30. wu ling zhi,

31. xue jie,

32. yan hu suo,

33. ye ju hua,

34. yi mu cao,

35. yu jin,

36. ze lan,

37. zhang hong hua,

38. zi ran tong.