Nine million more prescriptions for the antidote to opioid overdose could have been prescribed last year if medical providers had followed federal guidelines.

Rural areas are particularly less likely to have access to the antidote, called naloxone, that reverses the effects of an overdose, according to an issue of the Centers for Disease Control and Prevention’s Vital Signs publication released Tuesday. The CDC reported that, in all, medical providers tend to prescribe naloxone once for every 70 high doses of prescription painkillers.