Alexion Pharmaceuticals (ALXN) announced that it would acquire Achillion Pharmaceuticals (ACHN) for approximately $930 million. There are other stipulations that were added to make this deal decent for Achillion. There are still some measures that must be closed before such a deal can be completed. This acquisition was a smart one for Alexion, because it will add another drug that treats complement mediated diseases. I believe this was a move that Alexion had to make, otherwise it could have faced competition from Achillion in the coming years. Sales of Alexion Pharmaceuticals'