“Gas station heroin” is tianeptine, an antidepressant that was approved for medical use in the far east.
If you take about 20 times the dose used for depression it’s supposed to make you feel something. Obviously this is not a big drug of choice, otherwise nobody would use fentanyl.
Back in the 1980’s kids used to smoke banana peels to get high which probably did as much as tianeptine does.
Yes that is the drug and some states are outlawing it. Not sure if you can even get a prescription in those states.