What the DEA had to say,from here:
http://www.beyond-the-illusion.com/...Archive/drugs/politics/laws/us/fr/59.FR.10718
It seems it has been used rather widely...

"...Chemically ALPHA-ET is ALPHA-ethyl-1H-indole-3-ethanamine or 3-(2-
aminobutyl) indole. It is also known as etryptamine or Monase
(brand name, acetate salt). In the early 1960's, it was marketed
by the Upjohn Company as an antidepressant in the United States.
After less than one year of marketing, Upjohn withdrew its New
Drug Application when it became apparent that ALPHA-ET administration
was associated with agranulocytosis. The Food and Drug Administration
(FDS) has notified the DEA that there are no exemptions or approvals
in effect under section 505 of the Federal Food, Drug, and Cosmetic
Act for ALPHA-ET. A search of the scientific and medical literature
revealed no indications of current medical use of ALPHA-ET in the
United States.
In animal studies, ALPHA-ET has a pharmacological profile similar
to other Schedule I controlled substances. In drug discrimination
paradigms, ALPHA-ET fully substituted for both 1-(2,5-dimethoxy-
4-methylphenyl)-2-aminopropane (DOM) and 3,4-methylenedioxymethamphetamine
(MDMA). In a behavioral paradigm that distinguishes between
stimulants, classical hallucinogens and MDMA-like substances,
ALPHA-ET closely resembles MDMA. Recent data indicate that ALPHA-ET,
like MDMA, may be toxic to serotonergic neurons. In human studies,
ALPHA-ET's most prominent effect was an immediate feeling of exhilaration
and intoxication at an oral dose of 150 mg.
DEA first encountered ALPHA-ET in 1986 at a clandestine laboratory
in Nevada. Several exhibits of ALPHA-ET have been analyzed by DEA
and state forensic laboratories since 1989.
Individuals in Colorado and Arizona have purchased several
kilograms of this substance from chemical supply companies.
It has been distributed and sold primarily to high school and
college students. Trafficked as ``ET'' or ``TRIP'', it has been
touted as an MDMA-like substance. The death of a nineteen year
old female in Arizona was attributed to ALPHA-ET toxicity. Illicit
use has been documented in both Germany and Spain. In Germany,
ALPHA-ET has been sold as ``Love Pearls'' or ``Love Pills'' and
its abuse has been associated with a number of deaths. At least
one death has been attributed to ALPHA-ET abuse in Spain...."