Daiichi Sankyo Receives Approval to Manufacture and Market Inavir(R) Influenza Antiviral Inhalant for Treatment in Japan

For Immediate Release Company name: DAIICHI SANKYO COMPANY, LIMITED Representative: Joji Nakayama, President and CEO (Code no.: 4568, First Section of Tokyo, Osaka and Nagoya Stock Exchanges) Please address inquiries to Toshiaki Sai, Corporate Officer, Vice President, Corporate Communications Department Telephone: +81-3-6225-1126 (Public Relations) +81-3-6225-1125 (Investor Relations) http://www.daiichisankyo.com/ Daiichi Sankyo Receives Approval to Manufacture and Market Inavir(R) Influenza Antiviral Inhalant for Treatment in Japan Tokyo, Japan (September 10, 2010) – Daiichi Sankyo Company, Limited (hereafter, Daiichi Sankyo), today announced that it has received approval in Japan to manufacture and market Inavir® Dry Powder Inhaler 20mg, for treatment of influenza that is a laninamivir octanoate hydrate prodrug. Inavir® is a long-acting neuraminidase inhibitor that Daiichi Sankyo developed for the Japanese market. Inavir® directly delivers the drug to the infected airways of influenza patients, and a single inhaled dose has proven to be as effective as a five-day course of oseltamivir for treatment of influenza. The company is confident that Inavir® will be an important alternative for treating influenza, both benefiting patients and contributing to society. Daiichi Sankyo has a solid record in developing and selling antibacterial agents, and also offers influenza vaccines. Inavir® complements the company’s lineup for preventing and treating primary and secondary influenza infections. Inavir® Overview Product name Inavir® Dry Powder Inhaler 20mg Generic name Laninamivir (International Nonproprietary Names) Indication Treating influenza A and B viruses Dosage and Administration Adults: A single inhaled dose of 40 mg of laninamivir octanoate hydrate Children: If less than 10 years old, a single inhaled dose of 20 mg of laninamivir octanoate hydrate. If 10 years old or older, a single inhaled dose of 40 mg. Approval date September 10, 2010 End

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