How drugs can speed up and slow down time.

Psychoactive drugs can impair the judgment of time. 

Stimulants can lead both humans and rats to overestimate time intervals,^[8[88] while depressants can have the opposite effect.^[ 

The level of activity in the brain of neurotransmitters such as dopamine and norepinephrine may be the reason for this.

 Such chemicals will either excite or inhibit the firing of neurons in the brain, with a greater firing rate allowing the brain to register the occurrence of more events within a given interval (speed up time) and a decreased firing rate reducing the brain's capacity to distinguish events occurring within a given interval (slow down time).

Mental chronometry is the use of response time in perceptual-motor tasks to infer the content, duration, and temporal sequencing of cognitive operations