Sanofi

Company overview

Sanofi is a French drug maker and one of the world's largest vaccine producers, based in Paris. Its best-known medicine, Dupixent, treats eczema, asthma and other inflammatory diseases, and it makes vaccines for flu, meningitis, polio and other infections. It also develops treatments for rare diseases, blood disorders and multiple sclerosis, and invests in mRNA technology to develop new vaccines more quickly. Its vaccines are designed using the genetic sequences of viruses and bacteria. Sanofi spun off its consumer health business, Opella, in 2025. It works with Regeneron on Dupixent and other antibody medicines.