Psycho (Fallout: New Vegas)

Characteristics
The player may consume psycho or use it as an ingredient in slasher, which increases both damage and damage resistance but has a much shorter duration.

Locations

 * In the Dino Dee-lite motel, second room from the left on the top floor.
 * 2 on the floor of the Great Khans hideout in Boulder City, behind the shop counter.
 * Can sometimes be found on Fiends and ghouls.
 * Several can be found on the ground at the Tribal Village
 * Can be found in and around the Bison Steve hotel.
 * Is sold by Jack at Red Rock Drug Lab.

Related quests

 * High Times: Jacob needs 1 dose for the improved cure the player can suggest with 50 Science.
 * Flags of Our Foul-Ups: Razz wants you to convince his squad to use it.
 * Kings' Gambit: One of the solutions (to cease hostilities between NCR and The Kings) is add 1 psycho in the stash of jet of Pacer, to kill him.
 * Back in Your Own Backyard: Ranger Milo can be impressed by the Courier's possession of 24 or more doses of the drug, earning a small amount of NCR fame.
 * Aba Daba Honeymoon: After delivering the Khans drug shipment to Motor-Runner, the player can sell the drug to him in exchange for 20 caps, 22 after a barter check. The most the player can ever sell the drug for normally is 20 caps with high barter or discounts.
 * Malleable Mini Boomer Minds: The player can offer one of the Boomer children the drug by telling him it will make him a better boxer, this results in Boomer infamy.
 * Happy Trails Expedition: If the player can pass a medicine check of 45 when speaking to Ricky, then they can sell him 1-10 hits of the drug for the exorbitant price of 30 caps each. This is the most money the player can get for the drug in the game.

All Roads
The drug is featured prominently in the deaths of the Singer (poisoned by Swank), Chance (overdose enabled by Benny) and a group of Fiends that burned their victims at the Tribal Village. Benny says in one line regarding the drug, "Only thing in that vial is Vegas".

Behind the scenes
While it may not contain similar drugs, psycho's background is similar to that of the real-life drug cocktail D-IX, developed by Nazi Germany to increase military effectiveness.