Jeil Pharmaceutical (제일약품) is a company that develops and manufactures pharmaceutical products. It specializes in pharmacology and toxicology, organic synthesis, formulation, and analysis of new drug ingredients, modified drugs, and generic drugs. The company provides products in the areas of antibiotic, gastrointestinal, cardiovascular, neuropsychiatry, oncology, endocrinology, urology, antiviral, and antihistamine.