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	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

I read with interest the letter by Feingold¹ about a case of hypokalemia induced by herbal tea. Herbs have been used as both medicines and foods since the beginning of human civilization. Herbal medicines have made many important contributions to modern pharmacology, including ephedrine from Ephedra sinica (Ma Huang), digoxin from Digitalis purpurea (foxglove), aspirin from Salix alba (willowbark), and reserpine from Rauwolfia serpentina (snakeroot), to name just a few.² In recent years, the herbal market in the United States has experienced unprecedented growth; one third of the nation's adults used herbal remedies,³ and over two thirds of patients did not reveal their herbal use to their physicians.³ Hence, not only is the potential for drug-herb interaction unmonitored, but the concomitant use of drugs and herbs may not even be acknowledged.⁴

The importance of unrecognized interactions between herbs and conventional drugs is particularly relevant in cardiology because many cardiovascular drugs . . . [Full Text of this Article]

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