Indiplon

Treatment for Insomnia

Neurocrine Completes Review of Indiplon Action Letters

SAN DIEGO, June 15, 2006 -- Neurocrine Biosciences, Inc. announced that the Company has completed its review of the indiplon action letters and has requested a meeting with the Food and Drug Administration (FDA). During the past several weeks the Company has been preparing a briefing document which will be submitted to the FDA. This briefing document will assist the Company in articulating its understanding of the issues communicated by the FDA in the May 15th action letters. The action letters included an Approvable Letter for 5 mg and 10 mg immediate release indiplon capsules and a Not Approvable Letter for indiplon 15 mg extended release tablets received by the Company on May 15, 2006. The feedback from this FDA meeting will help the Company determine plans in moving forward.

The FDA Approvable Letter for indiplon 5 mg and 10 mg capsules requested that the Company reanalyze data from certain preclinical and clinical studies to support approval of indiplon capsules for sleep initiation and middle of the night dosing. The FDA also requested reexamination of the safety analysis for the elderly population. The FDA may require additional clinical and/or pre-clinical safety data.

The FDA Not Approvable Letter for indiplon 15 mg tablets requested that the Company reanalyze certain safety and efficacy data. The letter also questioned the sufficiency of the Company's objective sleep maintenance clinical data with the 15 mg tablet in view of the fact that the majority of the Company's indiplon tablet studies were conducted with doses higher than 15 mg. Additional clinical data will likely be required.

The Company believes that information it included in the submissions and subsequent amendments submitted during the review period have provided responses to a number of the issues raised by the FDA in the action letters. These amendments include reanalysis of certain data for indiplon capsules and a polysomnographic clinical study with indiplon 15 mg tablets.

"On May 17, we notified the FDA that we intend to further amend both applications to respond to the deficiencies raised by the FDA. Our immediate focus is to meet with the FDA to determine the nature and scope of any additional preclinical and/or clinical work the agency may require for approval," said Gary Lyons, President and Chief Executive Officer. "We will make final plans for the NDA resubmissions once we have clarified this in conference with the FDA. We are also expecting to amend financial guidance in our second quarter financial webcast."

Source: Neurocrine Biosciences, Inc.

Posted: June 2006

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