In the words of former FDA Commissioner Scott Gottlieb, the five-week government shutdown that ended Jan. 25 was "the most difficult operational challenge we have faced in modern times." While the full impact of that challenge could ripple through the FDA for a while, it made little difference in the number of warning letters the agency sent out between Dec. 23 and Jan. 25.

Approval of Alexion Pharmaceutical Inc.'s Soliris (eculizumab) injection to treat neuromyelitis optica spectrum disorder (NMOSD) in adult patients who are anti-aquaporin-4 (AQP4) antibody positive makes it the first and only FDA-approved treatment. It's also one of the most expensive treatments in the world, making it vulnerable to off-label use and the eventual creep of biosimilars into the market.