Why do people claim ketamine will have long lasting or permanent impact on your mental health, but other NMDAR-antagonists don’t?

Question

If I take dextromethorphan (NyQuil) then four or so hours later I’m back to feeling like I did before I took it.

Just to be clear, I’m asking about taking ketamine under the supervision of a doctor. Not recreationally.

In: 23

Answer 1

I was told by a psychiatrist that the ketamine treatment is ongoing. You need to keep going back to maintain the effects so I don’t know how long term the effects are. Psilocybin and even LSD have been known to have long term effects.