>So the important point is that Amphastar was sufficiently concerned about an MNTA only approval that they would take this step. And what caused them to act now (rather than earlier)?<
As previously discussed (#msg-33858393), Amphastar’s prospects to get FDA approval dimmed when the FDA did not act during Amphastar’s 180-day exclusivity period, which ended on 3/31/09. The new action by Amphastar relating to Dr. Woodcock adds to the circumstantial evidence that Amphastar’s ANDA is unlikely to be approved.