Psycho is a drug in Fallout 3 found across the Capital Wasteland. Using Psycho will provide an immediate +25% Damage to the players attacks. Those who consume the drug have a 10% chance of addiction, which results in -1 Endurance and -1 Perception.
It can be looted of most Wastelanders and many Talon Company mercenaries seem to have the drug in their inventories. Psycho may be purchased off of the following people: