The episode where Carlton takes pills that make him hyper is “Just Say Yo.” It is the 19th episode of The Fresh Prince of Bel-Air’s third season, which aired on February 15, 1993.
In the story, Will is exhausted from juggling school, work, basketball, and his relationship. A classmate gives him amphetamines to help him stay awake, and Will stores the pills in his locker. Carlton, worried about a blemish and looking for vitamins before the senior prom, mistakenly takes them.
The pills cause Carlton to become unusually energetic, leading to one of the show’s most memorable comic moments before he collapses and needs hospital treatment. The episode then turns serious as Carlton initially protects Will, but Will eventually admits that the pills came from his locker.
“Just Say Yo” is often remembered as a very special episode because it combines the sitcom’s comedy with a warning about stimulant misuse and taking unidentified medication. It is also frequently associated with Carlton’s energetic dance and the later “Carlton” character tradition.