99 francs Catching up South
Well, first of all, I came up with the most beautiful film adaptation of the book by Irwin Welch, which we call "ON NEEDLE". This is where realism and horror are, IMHO
To the already mentioned "Fear and Loathing in Las Vegas" and others, you can add the following films:
1) "Trip" 1967 ... The name speaks for itself. From a technical point of view, the image of LSD trips in this tape now looks rather ridiculous (albeit inventive), but still make allowance for the fact that almost half a century has passed. Jack Nicholson also wrote the script. By the way, based on personal experience.
2) Crazy Out 1968. From an artistic point of view, everything approximately fits the previous description, again, but here it is more often scary, not funny. And if in "The Trip" Nicholson remained behind the scenes, then here he is in one of the main roles.
3) "Other hypostases" - Ken Russell's tape about a scientist who experiments with consciousness. 1980 year. A very controversial picture - both in its message, and in visual terms, and in rhythm. But it suits the given topic quite well.
4) "Generation P". You can argue as much as you like about the quality of this film and talk about its difference from Pelevin's book, but this is not the point now. And that the trip is there too.
5) Alice in Acid Land 1969. And again a telling name. Not the best example, but since you need tapes that have a trip, you need to include this picture in the list. For those who do not have a lot of free time and who are not a fan of black-and-white eroticism, I do not advise you to watch. And to those who decide to sit down for this, I inform you that you can, in general, safely rewind in large chunks and not miss anything. The trip itself is at the end.
6) Well, and also "Entering the void" Gaspar Noe can be considered as one big trip (bad trip?), why not.
The first thing that comes to mind is "Fear and Loathing in Las Vegas". And also "The Wolf of Wall Street", "Dirt" and two of my favorites "Lunch Naked" and, although there are no hallucinations from drugs, but this is no less interesting "Videodrome".