Dainippon Sumitomo Pharma Co., Ltd. and Sepracor, Inc. Announce Completion of Subsequent Offering Period and Exercise of Top-Up Option

OSAKA, Japan & MARLBOROUGH, Mass.--(BUSINESS WIRE)--Dainippon Sumitomo Pharma Co., Ltd. (“DSP”) and Sepracor Inc. (“Sepracor”) (NASDAQ: SEPR) today announce the successful completion of the cash tender offer by DSP’s indirect wholly-owned subsidiary, Aptiom, Inc. (“Offeror”), to acquire all of the outstanding shares of common stock of Sepracor for $23.00 per share. The subsequent offering period for the tender offer expired, as scheduled, at 5:00 p.m., New York City time, on Monday, October 19, 2009. The depositary for the tender offer has advised DSP that, as of the expiration of the subsequent offering period, a total of approximately 96,590,423 shares were validly tendered in the tender offer (including during the subsequent offering period), representing approximately 86.9% of all outstanding shares of Sepracor. Offeror has accepted for payment all shares that were validly tendered in the tender offer and not properly withdrawn during the initial offering period, and payment for such shares has or will be made promptly, in accordance with the terms of the tender offer.