Herbs and related products are commonly used by patients who also seek
conventional health care. All physicians, regardless of specialty or
interest, care for patients who use products that are neither prescrib
ed nor recommended. Some herbs have been extensively studied, but litt
le is known about others. When a patient asks for advice regarding the
use of a particular herb, how should a physician respond? Similarly,
how does a physician determine if a patient's symptoms are caused by a
''remedy''? This review attempts to answer these questions by investi
gating pertinent definitions, the history of herbs in medicine, epidem
iology and prevalence of herbal use, and relevant psychosocial issues.