The two generic drug manufacturers have been attempting to sell cheaper copies of Lovenox, a blood thinner, in the US. However, the patent does not expire until 2012.
Sanofi-Aventis also sued a division of the drugs firm Novartis for copying the treatment.
Sanofi-Aventis specializes in seven major therapeutic areas: cardiovascular, thrombosis, oncology metabolic diseases, central nervous system, internal medicine, and vaccines.
Another of Sanofi-aventis’ drugs, Plavix, is being duplicated by generic companies. Plavix is the world’s second best selling drug.