Patients' use of alternative and complementary health services has cre
ated a need for physicians to become informed about the current litera
ture regarding these treatments. Herbal remedies may be encountered in
psychiatric practice when they are used to treat psychiatric symptoms
; produce changes in mood, thinking, or behavior as a side effect; or
interact with psychiatric medications. English-language articles and t
ranslated abstracts or articles (where available) found on MEDLINE and
sources from the alternative/complementary health field were reviewed
. Each herb was assessed for its safety, side effects, drug interactio
ns, and efficacy in treating target symptoms or diagnoses, A synopsis
of the information available for each herb is presented. In many cases
the quantity and quality of data were insufficient to make definitive
conclusions about efficacy or safety. However, there was good evidenc
e for the efficacy of St John's wort for the treatment of depression a
nd for ginkgo in the treatment of memory impairment caused by dementia
. More research is required for most of the herbs reviewed, but the in
formation published to date is still of clinical interest in diagnosin
g, counseling, and treating patients who may be taking botanical remed
ies.