PW2101

Treatment for Hypertension, Angina Pectoris

Penwest Receives Non-Approvable Letter from FDA for PW2101

DANBURY, Conn., June 29, 2005 -- Penwest Pharmaceuticals Co. (NASDAQ:PPCO) today announced that the U.S. Food and Drug Administration (FDA) has issued a non-approvable letter for the Company's New Drug Application (NDA) for PW2101, a beta blocker intended for the treatment of hypertension and angina.

In its letter, the FDA stated that the NDA was non-approvable due to, among other things, the degree of kinetic variability of PW2101 observed among individuals and because beta blockade as a surrogate for efficacy was not demonstrated across the entire inter-dosing interval on an individual subject basis.

Given the FDA's concerns, the time and resources the Company expects it would take to address them, and the commercial window for this product opportunity, Penwest has decided not to undertake the additional activities on PW2101 that it believes would be required to address the FDA's concerns.

Robert J. Hennessey, President and Chief Executive Officer of Penwest, said, "We are very disappointed by the FDA's decision. We have concluded that given these circumstances it is not in the best interests of our Company and our shareholders to continue with the additional activities we believe would be required for this product. We are continuing the development of the other product opportunities in our portfolio and are pleased with the progress we are making in developing compounds targeted at diseases of the central nervous system."

Penwest Pharmaceuticals
Penwest develops pharmaceutical products based on innovative oral drug delivery technologies. We are focusing our development efforts principally on products that address diseases of the central nervous system. The foundation of our technology platform is TIMERx(R), an extended release delivery system that is adaptable to soluble and insoluble drugs and that is flexible for a variety of controlled release profiles. We have also developed three additional oral drug delivery systems, Geminex(R), SyncroDose(TM) and a gastroretentive system. Geminex is a dual drug delivery system that is designed to provide independent release of different active ingredients contained in a drug, SyncroDose is a drug delivery system that is designed to release the active ingredient of a drug at the desired site and time in the digestive tract, and the gastroretentive system is designed to deliver drug in the stomach and the upper gastrointestinal tract.

Source: Penwest Pharmaceuticals Co.

Posted: June 2005

PW2101 FDA Approval History

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