A drug that reverses an opioid overdose and prevents death is often cited by public health experts as a bridge that would connect people to addiction treatment. But evidence suggests it is acting more akin to a revolving door of continued substance abuse.

The overdose-reversal drug naloxone has historically been administered by first responders such as police officers. Now that the drug comes in easy-to-use devices, including an auto-injector and a nasal spray, health officials are urging laypeople carry them to save lives.