The drug maker specializes in heart and cancer ailments and has promising new medicines. Stroke drug Lovenox is its top seller, and sales are rapidly growing for its insulin brand Lantus.
The French pharma giant has managed to grow the franchise for its insomnia drug Ambien, despite a recently-expired patent, largely because of creative patented spin-offs. Sanofi is also trying to get its weight-loss drug Acomplia approved in the U.S.
In addition, the company is a leading vaccine maker in a once-sluggish industry that's ramping up: The U.S. government recently awarded Sanofi a $100 million grant to find a faster way to make bird flu vaccines.