Psycho (Fallout 3)

Background
Psycho is very common in the Capital Wasteland. It is sometimes sold secretly, requiring dialogue and possibly a speech check to convince the proprietor. There are around 60 in set locations in-game.

In the Operation: Anchorage add-on, the origins of the chem are explored in more detail. The American field doctor in the simulation can give the player psycho before combat, and a holodisk can be found that details the creation and use of the drug. It is also revealed that it can cause anger issues and other dangerous, long lasting side effects.

Locations

 * At least one dose can be found in Silver's house.
 * Several doses can be found in the Super Duper Mart.
 * Frequently found in raider establishments.
 * Sold by Doc Hoff, Cindy Cantelli, Ahzrukhal, Leo Stahl, and various other vendors.
 * Three can be stolen from A Quick Fix in Rivet City.
 * Four can be stolen from Cantelli's room in Rivet City.
 * Dead bodies of wastelanders and feral ghouls.
 * Can be found on the corpses of Talon Company merc and raiders.
 * Sold by Wasteland Junkie around burning barrels in the wastelands, along with jet, Mentats, and other addictive chems. (See Fallout 3 random encounters)
 * Given by field doctor during Operation: Anchorage (add-on).