Mark Kinzly saved two lives this week. But he wouldn’t have been here to help if a friend hadn’t once done for him what he’s now repeatedly done for others — provide overdose victims with Naloxone, the antidote that revived them.

Overdose now kills more people in the United States than car accidents, making it the leading cause of injury-related mortality according to the latest statistics from the Centers for Disease Control and Prevention. The number of deaths — 37,485 in 2009 — could be cut dramatically if Naloxone were available over-the-counter and placed in every first aid kit.

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