MAOIs started off due to the serendipitous discovery that iproniazid was a potent MAO inhibitor (MAOI).  Originally intended for the treatment of tuberculosis, in 1952, iproniazid's antidepressant properties were discovered when researchers noted that the depressed patients given iproniazid experienced a relief of their depression. Subsequent in vitro work led to the discovery that it inhibited MAO and eventually to the monoamine theory of depression . MAOIs became widely used as antidepressants in the early 1950s. The discovery of the 2 isoenzymes of MAO has led to the development of selective MAOIs that may have a more favorable side-effect profile. 
recommend 3 additional guides that are particularly helpful and accessible.
Each because each: (a) is free and available on the internet so that
that clinicians, graduate students, interns, supervisors, and others anywhere
in the world can access them as long as an internet connection is available,
even in the absence of access to a professional library; (b) is free so
that those who may be struggling to make ends meet or with limited funds
can obtain them without burdening the budget; and (c) and was written by
a psychologist elected to serve on the American Psychological Association's
Ethics Committee and has experience in working with the ethics code as
it impacts the lives of individual psychologists. These guides are
Jeff Youngren's "Ethical Decision-making and Dual Relationships" available
at http:///dual/ ;
Janet Sonne's "Nonsexual
Multiple Relationships: A Practical Decision-Making Model for Clinicians" at http:///site/multiple- ;
and Mike Gottlieb's "Avoiding Exploitive Dual Relationships: A Decision-making
Model" available at http:///dual/ .
Stone, Michael H. (1993). Abnormalities of personality: within and beyond the realm of treatment . New York: . Norton.
Tamney, Joseph B. (2002). The Resilience of Conservative Religion . New York: Cambridge UP.
Histrionic Personality Disorder: links Personality Disorders