In the middle of an epidemic of opioid overdoses, doctors, hospitals and pharmacies across America are facing intense pressure to cut back on prescribing and dispensing the drugs. About 8 million patients in the U.S. who depend on opioids to face constant, intense pain are at risk of losing access to the one treatment that seems to make the pain bearable. The number of opioid prescriptions has plummeted from a high of 251 million in 2010 to well under half that number in 2020. Yet the number of opioid overdoses has only continued to climb, even as drugs like buprenorphine...