Introduction
Many of today's drugs have been derived from plant resources
Historically, medicinal plants have provided a source of
inspiration for novel therapeutic drugs, as plant derived
medicines have made large contributions to the health and well
being of humans. According to the World Health Organization
(WHO), nowadays, 80% of the world's population rely on
or their primary health care The medicinal value of
a
plants is due to the substances that it contains which pr
physiological action on the human body. Some examples of
these substances are alkaloids, essential oils, tannins, resins, and
many others. Moreover, some negative effects obtained in the
use of local plants as source of medicine are basically due to
over dosage and lack of adequate knowledge of other
detrimental by-products contained in some plants