We see a man on out his face on LSD, we aren't shown him taking the drug.
The film contains a few scenes depicting illegal drug use in a discreet manner.
In one scene, a man passes a packet of white powder to the protagonist, who is shown sitting and staring into space after that. In another scene, a group of young men are smoking what appear like joints. However, illegal drug use is not explicitly established in both scenes but implied through the demeanor of the characters.
Throughout the film, illegal drug use is depicted discreetly in a non-promotional manner. Overall, the film portrays the protagonists struggle with psychosis, where he occasionally uses illegal drugs to deal with the symptoms of his mental instability.