Sanofi-Aventis ( , ), headquartered in Paris, France, is a multinational pharmaceutical company. The company is one of the five largest pharmaceutical companies in the world. Sanofi-Aventis engages in the research, development, manufacturing and marketing of pharmaceutical products for sale principally in the prescription market, but they also develop over-the-counter medication. Sanofi-Aventis cover 7 major therapeutic areas: cardiovascular, thrombosis, oncology, diabetes, central nervous system, internal medicine and vaccines (with its subsidiary Sanofi Pasteur).