it's called naloxone alslsown by therarade name narcan. as you're abouout to seen this documentary abouug addicts in chicago,arca can lerlly ing heroin addicts whoho have overerdosebaba from near certain ath. at first, , the hein user is euphor. >> oh,h, my d.d. th is good. >> but w whin the and a half minutes he falls into a upor. oversing on heroin. as his breatathi slo his wife panics. >> o g. >> andnd the fililaker gives hi moutto-mouth resuscitation. when that fails, the filmake who carries narcan with hi bebecause of his work with addis gigis him an injection of it. only six and a halalf minute tehe's sitting up. >> there he is. ckck from the dead. ou just died. we h had tgive you narcan. >> five minunutes aftethat, he's walking around. >> fit as a fiddddle. all l righ >> narcan n rkrks blocking the opte receptors in t the b bra atat hoin activates,, reversinig the slowdown in breathingng tt can lead to dedeh.h. it's been n eded iemergency rorooms d d paramedics for years. >>erere have an opportunity to help fofos s st alive so they