A surge of opioid-related deaths in the U.S. has created an opportunity for pharma companies that make the overdose antidote naloxone. The drug's price has risen tenfold in recent years, Bloomberg reports, and state and local governments are shelling out to make it more widely available. One beneficiary? Amphastar Pharmaceuticals ($AMPH), which saw a 41% Q2 boost in revenue from its fully manufactured drugs. And the company is developing a ready-made naloxone nasal spray it hopes will pad its top line further. More