drug is defined as any substance that, when taken internally
(e.g. swallowed or injected into the body) modifies one or
more bodily functions - such as physical functions, cognitive
functions, immune system functions, etc. Technically, the
classification of drug includes not only medication and drugs
of abuse but also such substances as alcohol, caffeine and
Article : "GINKGO"
by Catherine E. Myers. Copyright © 2006 Memory Loss and the Brain