Only a few interactions between popular herbal medicines and prescribed drugs are known to have serious consequences

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Herbal medicines are often taken concomitantly with pharmacotherapy. A recent systematic review of possible interactions between seven popular herbal medicines (ginkgo, St John's wort, ginseng, garlic, echinacea, saw palmetto and kava) and conventional drugs found numerous interactions between herbal medicines and conventional drugs. The significance of many interactions is uncertain; however, several interactions, particularly those with St John's wort, may have serious clinical consequences.

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