Hi Danette,
A book that I really like is Herbal Contraindications and Drug Interactions plus Herbal Adjuncts with Medicines, by Francis Brinker there is an expanded 4th edition for this. There is also the A-Z Guide to Drug-Herb-Vitamin Interactions book.
You can also gain some information off of Drugs.com . On occasion this site has good information about interactions between herbs and drugs, but it doesn’t have all herbs on there.
With warmth,
Benna