ILSUNG IS Co., Ltd. engages in the development, manufacture and sale of pharmaceutical products. Its products include contrast media, patches, antibiotics, antiviral agents, dermatologic agents, cardiovascular agents, antidiabetic agents, analgesics, muscle relaxants, neuropsychiatric agents, antitussives, and expectorants. The company was founded by Yoon Byung-Kang in 1954 and is headquartered in Seoul, South Korea.