Preliminary research out this week has found interesting news on patients taking opioids.<br />The research suggests patients taking opioids for chronic pain can produce antibodies to the drugs.<br />This could help explain some of the side-effects of long-term opioid use, reports Gizmodo.<br />These antibodies may also hamper efforts to create opioid vaccines.<br />Scientists hope it could treat opioid use disorder better than existing medications.