Purdue Pharma, which manufactures OxyContin and a few other opioid painkillers, has received a patent for a “new” medication to treat opioid addiction. This is in the wake of a $3.4 million donation to Harm Reduction Therapeutics, manufacturer of naloxone—or Narcan, a nasal spray used to counteract deadly overdoses. These new advances have left some consumers wondering: Have company leaders grown a...