Naloxone
"I had been taking Valium crack and heroin for the day and ended up getting abit more heroin at nite, after I took it my friend kept telling me I was grey with blue lips but I was to doped to care!
We ended up staying at my house and I nodded off very fast, 
I woke him up 3 minutes late by vomiting on him but he couldn't wake me so he put me in recovery position and phoned ambulance.
15mins late they came and found that my heart was beating just 6 times a minute and unresponsive so they pumped air into my stomach and gave me a shot of narcan and I just remember seeing white lights as my lights were on in my room and green clothes of the paramedics they carried me into the ambulance and when I arrived they had to give me another dose. It saved my life"