There is more to this news than meets the eye.The past two years have been challenging for Novo Nordisk (NVO +0.80%). The Denmark-based pharmaceutical company has dealt with worse-than-expected earnings, clinical-trial setbacks, and significant competition in its core therapeutic area that has eroded its market share.And it seems like the bad news keeps on rolling in for the drugmaker. Recent regulatory changes in the U.S. have introduced yet another potential obstacle for Novo Nordisk.When it rains, it pou ...