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SIBIA Neurosciences Commences Phase I
Clinical Trials in Parkinson's Disease With Its
Proprietary Compound Targeting Nicotinic
Acetylcholine Receptors

Source: PR Newswire

LA JOLLA, Calif., Feb. 18 /PRNewswire/ via Individual Inc. -- SIBIA
Neurosciences, Inc. (Nasdaq NNM: SIBI) today announced that it has
commenced under a U.S. IND a Phase I clinical trial in Parkinson's
disease with SIB-1508Y, the Company's proprietary neuronal nicotinic
acetylcholine receptor agonist.

The trial will evaluate the safety and pharmacokinetics of SIB-1508Y
in a rising dose study of healthy male volunteers under both fasted
and fed conditions. Based on the results of this study, SIBIA plans to
conduct Phase II studies to evaluate the compound's effect on motor
and cognitive deficits in Parkinson's disease patients.

SIB-1508Y is one of several new classes of compounds discovered by
SIBIA that are selective for specific human receptor/ion channel
subtypes in the brain. These receptor subtypes modulate communication
between nerve cells and play a key role in a variety of neurological
disorders. Since SIB-1508Y exhibits subtype-selective activity, SIBIA
believes the compound could be more effective and have fewer side
effects than existing drugs.

SIB-1508Y acts at certain nicotinic acetylcholine receptor subtypes
that regulate the release of dopamine and acetylcholine
neutotransmitters, both relevant in the deficits caused by Parkinson's
disease. A deficiency of dopamine in specific brain regions has been
shown to be a major factor in the onset and progression of Parkinson's
disease, which has traditionally been viewed as a disorder of motor
function. It is now recognized that cognitive deficits, including
difficulties in planning and abstract thinking, are also seen in
Parkinson's patients, and acetylcholine is presumed to be important to
these aspects of the disease. In pre-clinical animal models of
Parkinson's disease, SIB-1508Y has demonstrated a positive effect on
both motor and cognitive deficits. Based on these studies, SIBIA
believes SIB-1508Y may offer a new treatment paradigm for Parkinson's
disease, with distinct advantages over currently available therapies
that only address the motor deficits of this disorder.

Commenting on the announcement, SIBIA President and CEO William T.
Comer, Ph.D., stated, "The commencement of human clinical trials with
our lead compound for Parkinson's disease is an important milestone
for SIBIA. While we have successfully demonstrated the desired effects
on both motor and cognitive deficits in animal models, our goal now
will be to demonstrate the safety, then the efficacy. of the compound
in humans. SIB-1508Y is the first selective nicotinic agonist being
evaluated in Parkinson's patients, and we believe that this novel
mechanistic approach will provide significant benefits to patients."

SIBIA Neurosciences, Inc. is engaged in the discovery and development
of novel, small molecule therapeutics for treating disorders of the
nervous system based on its unique approach to characterizing the
molecular processes involved in such disorders. SIBIA is focusing its
efforts on developing compounds for the treatment of Parkinson's
disease, Alzheimer's disease, stroke, head trauma, epilepsy, chronic
pain, schizophrenia and other disorders. The Company currently has
collaborations with Eli Lilly and Company, Novartis (formerly
CIBA-GEIGY Limited) and Bristol-Myers Squibb Company.

This press release contains forward-looking statements that involve
risks and uncertainties. As a result, actual results could differ
materially from those discussed herein. These risks and uncertainties
include SIBIA's early stage of development, the new and uncertain
state of SIBIA's technologies, SIBIA's future capital needs and the
uncertainty of receiving additional funding, uncertainties regarding
patents, proprietary rights and regulatory matters, and other
research, development and market risks. These and other risks and
uncertainties are more fully set forth in SIBIA's Prospectus included
in its Registration Statement on Form S-1 filed in connection with its
initial public offering, as well as in SIBIA's most recently filed
Form 1O-Q. SOURCE SIBIA Neurosciences, Inc.

/CONTACT: Michael J. Dunn, Vice President, Business Development or
Thomas A. Reed, Vice President, Finance & Administration, and CFO,
both of SIBIA Neurosciences, Inc., 619-452-5892/ (SIBI) CO: SIBIA
Neurosciences, Inc. ST: California IN: MTC SU: PDT   MZ-CW -- LATU037
-- 2010 02/18/97 07:01 EST http://www.prnewswire.com  [02-18-97 at
12:00 EST, PR Newswire]


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