In some countries including the United States, an extended-release formulation is marketed under the trade
name Vivitrol. It should not be confused with
naloxone, which is used in emergency cases of overdose rather than for longer-term dependence control
Naloxone is a drug used to counter the effects of opioid overdose, for example heroin or morphine overdose. Naloxone is specifically used to counteract life-threatening depression of the central nervous system and respiratory system.