Edit: apparently that’s not true. There’s a brand of DXM-only syrup called Robocough now. What a ridiculous name for a Legitimate Cough Medicine
Lot of interesting studies and anecdotes on its efficacy as an antidepressant
https://en.wikipedia.org/wiki/Ibogaine
"The action of ibogaine at the κ-opioid receptor may indeed contribute significantly to the psychoactive effects attributed to ibogaine ingestion; Salvia divinorum, another plant recognized for its strong hallucinogenic properties contains the chemical salvinorin A, which is a highly selective κ-opioid agonist"
However there is certainly a lack of data, and facilities doing treatment now are probably incentivized not to share adverse events.