Well it is an antagonist at both 5-HT2A and 5-HT2C receptors, indicating that it blocks psychedelic action. Even more than recommending against mixing such medication with psychedelics, I would say that the reason you were prescribed something like that in the first place should also be a very good reason why tripping is really not smart. I am not seeing off-label uses for it other than things that don't mix well with psychedelics, like PTSD. That may benefit from a trip perhaps but I think it is very tricky and you would need guidance for that. Just talking theoretically here, I assume you are not getting it off-label?
Anyway like I said: don't take psychedelics.
edit: please realize the risk you would be taking discontinuing meds like this: earlier symptoms very well may not be suppressed anymore and taking a psychedelic would be a way to aggravate them more. Why don't you seek help for the alcoholism in a more traditional way? A trip is really not a reliable cure...