About Otsuka

Otsuka Pharmaceutical was established in 1964.
At Otsuka Pharmaceutical, we are committed to a holistic approach to health and well-being of people and are striving to create innovative, thoroughly-original pharmaceutical and nutraceutical products based on our corporate philosophy
"Otsuka-people creating new products for better health worldwide".

Message from Top Management

As a total healthcare company
we strive to support the unique potential of each individual

Otsuka-people creating new products for better health worldwide

Otsuka People Talk

Otsuka employees share their stories of continually rising to the challenge

Corporate Profile

Timeline of Otsuka's History

Contact Addresses in Japan

Affiliated Companies Around the World

Production Activities

Business Collaborators

Corporate Governance

Other Information

Corporate brochure

Download our corporate brochure

(PDF：25.6MB)

Otsuka Virtual Factory Tour (Japanese)

News Releases

Pharmaceuticals

Otsuka BioVentures Begins Strategic Equity Investments

Pharmaceuticals

Otsuka Presents Landmark Final Phase 3 VISIONARY Results at ASN Demonstrating VOYXACT^® (sibeprenlimab-szsi) Stabilized Kidney Function and Reduced Risk of Disease Progression and Kidney Failure, Redefining Treatment Paradigm in IgA Nephropathy

Pharmaceuticals

Otsuka Presents New Phase 3b Results for SIMTRIYO® (centanafadine) Highlighting Consistent Improvements Across ADHD Symptoms, Anxiety, and Associated Features in Adults with ADHD and Comorbid Anxiety Disorders at Psych Congress 2026