Naloxone, also known as Narcan, is a medication designed to rapidly reverse opioid overdose.  It is an opioid antagonist—meaning that it binds to opioid receptors and can reverse and block the effects of other opioids.  It can very quickly restore normal respiration to a person whose breathing has slowed or stopped as a result of overdosing with heroin or prescription opioid pain medications.  There are 3 FDA approved methods of administering Naloxone, Narcan Nasal Spray being the most common.
Act 139 is a law that has been implemented in Pennsylvania that allows anyone to have access to Naloxone.  Act 139 also provides immunity to anyone reporting or responding to an overdose.  The access to Naloxone has proven to be effective.

As of June 2018, police departments in the state of Pennsylvania have reversed 7,689 overdoses, 215 coming from Lackawanna County.