Naloxone works by blocking the effect that painkillers and heroin have in the brain and reversing the slowed breathing and unconsciousness that come with an overdose. But as the demand for naloxone has risen - overdose deaths now total 130 every day, or roughly the capacity of a Boeing 737 - the drug's price has soared. Not long ago, a dose of the decades-old generic drug cost little more than a dollar. Now the lowest available price is nearly 20 times that. In 2014, more than 47,000 Americans died from drug overdoses. That was 50% more deaths than from highway accidents ... and more overdose deaths than any year on record. The overdose crisis has its roots in the 1990s, when doctors began prescribing more and higher doses of painkillers [in response] to campaigns, often funded behind the scenes by drug makers, that urged doctors to prescribe the strongest painkillers not just to cancer patients and others in severe pain, but also to those with milder pain. The narcotic manufacturers' funding of those campaigns ... came to light through evidence unearthed in lawsuits and investigative journalism reports. Since 1999, the amount of prescription opioids such as oxycodone, morphine and hydrocodone sold in the U.S. nearly quadrupled. During that same time, deaths from those drugs quadrupled. The lethal side effects of that booming prescription painkiller market has now sparked a moneymaking opportunity with naloxone.