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Asking the question supplies the answer. "Do no (further) harm".
Well, considering there is nothing more "harmful" than severe respiratory depression, and also considering that narcan is a relatively safe drug (especially when compared to the risks associated with not breathing) I'd say giving narcan to someone who needs it is never going to be "doing more harm". Rare complications aside, of course.
For some reason, people in the EMS community love to drone on about how ridiculously dangerous narcan is. I think part of the bad attitude towards narcan comes from a machismo that would rather intubate than simply push a med that instantly fixes the problem (if I had a buck for every time I heard a paramedic say something to the effect of "Narcan? Pfft. I just tube 'em all", I'd be rich), part of it comes from ED doctors and medical directors who don't like it because they give too much of it and then have to deal with the violence and hypertensive crises that sometimes follow, and part of it comes from simply not being experienced with the drug.
"But what about people who give it and don't call 911 and then the patient re-sedates!?!" So what? Would that patient have been better off if the narcan had never been given? Don't forget that these people often don't call 911 anyway....
I'm no authority on heroin and I'm sure the effects vary considerably depending on purity, what it's cut with, etc. But I have read that it's duration is generally shorter than that of morphine. Morphine's respiratory depressant effects from a single bolus generally peak at about 30-40 minutes and then begin to taper off at 60-75 minutes....compare that to the duration of action of narcan, which is 1-4 hours. Even at the low end (1 hour), it is unlikely that a dose of narcan given at the onset of respiratory depression will lose effect sooner than the resp depressant effects of morphine. And heroin doesn't even last as long as morphine. An OD of one of the oral opioids? Yeah, that is different. But does the fact that some people might not be helped by narcan mean that no one should have it?
If there is some compelling evidence that narcan does more harm than good, then yeah, it probably shouldn't be out there. But I don't think that is the case. The few trials involving layperson/police/EMT narcan administration that I've heard about were all considered successful.
I remember hearing the same doom-and-gloom when epi autoinjectors and even AED's were introduced. "The lay-public will never get this right. They'll kill each other left and right".