This drug is the OPPOSITE OF FUN. For real. You do NOT want naloxone (Narcan) unless you absolutely, positively need it. Naloxone is an opioid receptor antagonist. Think about it. Owwwwww.
The most important thing to know about naloxone is that it is the best way to rescue someone that has either overdosed on or had a bad reaction to morphine/heroin/any opioid. The reason it is NOT a fun drug is that it actually kicks morphine (and other opioid agonists) off the mu receptors, essentially reversing the peaceful, pain-free, near-death experience and throwing it into the complete opposite.
It’s certainly a nice thing to have around, and an absolute necessity when you are giving an opioid analgesic, but please, use it with care!