Overdose deaths in the United States finally reversed course in 2018, ending nearly two decades of almost unbroken annual increases — a sign that the coordinated public health response is starting to work. Expanded naloxone access, medication-assisted treatment, and community outreach all appear to have contributed, though no single intervention gets the credit. The picture inside the data is mixed: while opioid deaths fell, deaths involving cocaine and methamphetamine rose, suggesting the epidemic shifted rather than ended. Still, experts say this is evidence that scaling up treatment saves lives — and that doing so remains the central, unfinished challenge.