While I wouldn't buy after the recent news and pop - when that injuction is lifted and it sells off it would make a lot of sense to pick it up
I'm not expecting the injunction to be lifted on appeal, as Amphastar didn't mount much of a defense in the first place.
Your better entry point might be when the full impact of the AG on Q4 and future earnings are realized (the hybrid royalty/profit share is now priced in...what isn't is the extent of price/market share erosion).