Herb and Drug Interactions
Following is information not verified or researched by me. The apparent author
source is listed below. This information suggests certain circumstances in which using
herbs may cause concerns. Since this information was not confirmed please use it in an
advisory manner. To me this information suggests caution if considering using herbs.
- Echinacea,if used for more than eight consecutive weeks, could cause liver toxicity and
should not be used with drugs such as anabolic steroids, amiodarone and methotrexate which
are toxic to the liver as the affect may be additive.
- Feverfew, garlic, ginger, ginseng, and ginkgo biloba all affect bleeding time and should
not be taken by patients using warfarin or by patients that have decreased platelet
- St John's wort should not be taken with monoamine oxidase inhibitors or selective
serotonin reuptake inhibitors like Prozac and Paxil until more information is available.
- Licorice, plantain, hawthorn and ginseng may interfere with digoxin therapy and valerian
root should not be taken when barbiturates are used because it could cause an increase in
the barbituate effects.
- 'Evening primrose oil and borage are contraindicated in patients taking anticonvulsants
- lmmunostimulants such as echinacea and zinc should not be given with immuno suppressants
such as corticosteroids (like prednisone) and cyclosporine and are contraindicated in
patients suffering from rheumatoid arthritis, systemic lupus erythematosus and autoimmune
- Source: Hans Larsen is a health sciences researcher living in Victoria, British Columbia
from Alive Magazine March 1999 with some changes by D. Morrow