Interactions by Drug
The Vitamin Cottage lists brand-name and generic prescription drugs and the herbs and supplements that may interact with them, so that you can avoid potentially harmful interactions.
http://www.vitamincottage.com/common/adam/DisplayMonograph.asp?name=ConsLookups_InteractionsByDrug&storeID=47821D90B2AA4A7C91E85DD915331B09
Interactions by Herb or Supplement
If you prefer to check for potential harmful interactions with drugs you are taking by starting with the herbs and supplements you use, go to this site.
http://www.vitamincottage.com/common/adam/DisplayMonograph.asp?name=ConsLookups_InteractionsByHerbSupp&storeID=47821D90B2AA4A7C91E85DD915331B09
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