Momenta Pharmaceuticals Inc. has discovered that reining in the cost of health care can be hugely profitable.

The company’s generic version of the anti-blood-clotting drug Lovenox - priced about 30 percent cheaper than the brand-name drug made by French pharmaceutical giant Sanofi SA - helped boost Momenta’s revenues by 142 percent to $283 million last year, while profits zoomed 383 percent to $180 million.