Bart is put on medication to control his behavior, but the pills cause him to become paranoid and insane.



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Episode credited cast:
Groundskeeper Willie / Homer Simpson / Video Game Announcer / Krusty the Clown / Man in Showgirls / Grampa Simpson / Soldier #1 / Sideshow Mel (voice)
Marge Simpson (voice)
Lisa Simpson (voice)
Moe Szyslak / Apu Nahasapeemapetilon / Pharmacist #1 / Video Game Surfer / Technician / Carl / Organizer / Captain McAllister / Dr. Nick Riviera / Soldier #2 / Comic Book Guy / Lord Widebottom / Chief Wiggum / Lou (voice)
Edna Krabappel (voice)
Pharmacist #2 (voice)
Maude Flanders #1 / Showgirl (voice)
Martin Prince / Sherri (voice)
Karl Wiedergott ...
Stage Manager (voice)
Marcia Mitzman Gaven ...
Rest of cast listed alphabetically:
Mark McGwire ...
Himself (voice)


After yet another prank from Bart, involving flooding the gym, principal Skinner talks to Homer and Marge and advices them to make Bart take a new behavior drug, called Focusyn. At first Bart doesn't want to take the drug, but pretty soon he doesn't mind and it actually seems to work: Bart stops playing pranks, actually pays attention in class and reads in his spare time. Good times don't last and Bart starts behaving very strange and paranoid. Written by Marco van Hoof <>

Plot Summary | Add Synopsis


Animation | Comedy


TV-PG | See all certifications »

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Release Date:

3 October 1999 (USA)  »

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Technical Specs


Sound Mix:


Aspect Ratio:

1.33 : 1
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Did You Know?


At the very end Bart sings about his drugs using the Popeye theme tune. Nancy Cartwright who voices Bart, was also the voice of Woody on Popeye and Son. See more »


Bart asks the family to close the door to his room. You hear the door slam shut, but in the following shot, the door is wide open. See more »


Bart Simpson: Joke if you will, but did you know most people use ten per cent of their brains? I am now one of them. Before, my energy was all over the place. Now, it's concentrated like a laser beam. Well, this has been terrific. Let's do it again sometime.
Lisa Simpson: Are you standing up to get me to leave?
Bart Simpson: It's from the book.
Lisa Simpson: [scans the book, "The Seven Habits of Highly Effective Pre-Teens"] Hey! I'm not a Time Burglar!
Bart Simpson: [opens electronic organizer, types as he speaks] Memo to self: Lock door.
Lisa Simpson: All right, I'll go! You ...
See more »


Referenced in The Simpsons: At Long Last Leave (2012) See more »


While Strolling Through The Park One Day
Music by Ed Haley
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