[Chozenlaruso]

From your link:

"including prescription pain relievers, heroin, and synthetic opioids such as fentanyl"

So recreational drug abusers are included in the count? I believe the OP was only taking prescription drugs.

Is there a count somewhere of just the overdoses on prescribed opioids?

[ska]

It's tricky to meaningfully separate these cases, as many opioid addictions start with prescriptions and move to more available opioids when the prescriptions end.

[dodobirdlord]

This is substantially less common than is widely believed.

[ska]

This varies a lot by area, but it isn't rare.