September 25, 2002

Neurochem files Investigational New Drug application for Cerebril™ to treat Hemorrhagic Stroke due to Cerebral Amyloid Angiopathy.

Neurochem Inc. (TSX : NRM) announced today that it has filed an Investigational New Drug (IND) application with the U.S. Food and Drug Administration for Cerebril™, the Company's candidate for the treatment of Hemorrhagic Stroke due to Cerebral Amyloid Angiopathy (CAA). The IND submission precedes the initiation of a Phase II clinical trial in the United States for patients suffering from this life-threatening disease.

"This IND filing for Cerebril™ marks an important step for Neurochem as we move towards a more clinical focus in our pipeline with the possibility of three drug candidates in Phase II and Phase II/III stages of development," said Dr. Louis R. Lamontagne, President and CEO of Neurochem. "Neurochem's programs have the potential to strategically address large and specialty disease markets."

A Phase II clinical trial, scheduled to begin in four U.S. centers this fall, is expected to investigate the safety, tolerability and pharmacokinetic profile of Cerebril in CAA patients who have had lobar cerebral hemorrhage. The study is designed as a multi-center, randomized, double-blind, placebo-controlled and parallel design study. A total of 24 CAA patients with lobar cerebral hemorrhage will be randomized to receive placebo or Cerebril™ (3 dose levels) twice a day (BID) for a period of twelve weeks.

Neurochem has previously investigated the safety, tolerability and pharmacokinetic profiles of Cerebril in healthy volunteers in four Phase I clinical trials. In all four studies, Cerebril™ was shown to be safe and well tolerated at the anticipated therapeutic dose in both young and elderly volunteers.

About Cerebril™

Cerebril™ is a small organic molecule that has been designed to modify the course of Hemorrhagic Stroke due to CAA by interfering with the association between glycosaminoglycans (GAGs) and Aß amyloid protein in the blood vessels of the brain of patients with CAA. As part of a "disease modifying" class of drug candidates, Cerebril™ is expected to act at two levels: to prevent and stop the formation and deposition of amyloid fibrils and in binding to soluble Aß, to inhibit the inflammatory response associated with amyloid build-up in Hemorrhagic Stroke due to CAA. Cerebril™ is an oral, safe drug candidate that has simple manufacturing and a good pharmacokinetic profile.

Hemorrhagic Stroke due to Cerebral Amyloid Angiopathy

Hemorrhagic Stroke due to CAA, is characterized by the progressive invasion of the blood vessel walls in the brain by amyloid fibrils. The blood vessels becomes brittle and lead to recurrent strokes and potentially devastating lobar hemorrhages in the brain. It is considered a major type of stroke for which there is no effective treatment. While up to 80 percent of lobar hemorrhages are not fatal the first time, they are frequently recurrent and carry very high morbidity and mortality rates.

About Neurochem

Neurochem is an industry leader in the development of therapeutic drugs and diagnostic tools for central nervous system (CNS) and amyloid-related diseases associated with aging. The Company has to date advanced three drug candidates to clinical trials: Fibrillex™, for the life-threatening orphan disease, secondary amyloidosis in a pivotal Phase II/III clinical trial, Alzhemed™, for the treatment of Alzheimer's Disease advancing to Phase II clinical trials, and Cerebril™, for hemorrhagic stroke also advancing to Phase II clinical trials. The Company has built a strong product pipeline by developing a novel, proprietary series of compounds that inhibit the formation, deposition and toxic effects of amyloid fibrils within the body. Neurochem's overall therapeutic programs target CNS disorders including Alzheimer's disease, epileptic seizures caused by head trauma or acute brain injury, and hemorrhagic stroke (due to cerebral amyloid angiopathy), and other life-threatening diseases including systemic amyloidosis and amyloid-associated diabetes type II. (www.neurochem.com).

All of the statements contained in this news release, other than statements of fact which are independently verifiable at the date hereof, are forward-looking statements. Such statements, based as they are on the current expectations of management, inherently involve numerous risks and uncertainties, known and unknown. Some examples of known risks are: the impact of general economic conditions, general conditions in the pharmaceutical industry, changes in the regulatory environment in the jurisdictions in which Neurochem does business, stock market volatility, fluctuations in costs, and changes to the competitive environment due to consolidation or otherwise. Consequently, actual future results may differ materially from the anticipated results expressed in the forward-looking statements.

For further Information, please contact:
Dr. Lise Hébert
Vice President, Corporate Communications
lhebert@neurochem.com

275 Armand-Frappier
Laval (Quebec)
H7V 4A7
Tel: (450) 680-4500
Fax: (450) 680-4501

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