Perhaps a better system would be to combine the paramedic and firefighter response, even to the extent of sharing facilities. A cross-trained division, specialized training for medical response including overdoses. So yeah, specially trained dedicated teams,  but no reason they cannot come from the resources we already have, including firefighters. But until then...

We need to work together and collectively, not only for fast and effective response, but also to more efficiently utilize the resources we do have.

And we cannot cut the poor and addicted and those with mental health issues out of the herd for fast first response. We cannot allow addiction to ever dictate a lesser response, or to say carry-on for firefighter response to a heart attack, but no response to an OD.

Because as it is now, if firefighters do not respond to medical emergencies, the survival rate would be lower. For everyone.