Psycho

Psycho is a drug composed of strange and unknown chemicals of military origin, with a unique delivery system. It was designed at the orders of General Constantine Chase and is supposed to increase the combat potential of a soldier.

Psycho appears to be a form of injected drug, which, considering the large serum canister next to the needle, suggests that large quantities are needed to produce the effects.

Fallout, Fallout 2 and Fallout Tactics
Psycho has another beneficial effect not intended by the programmers. When taken, it reduces Intelligence by 3. This can be exploited to boost your skill points. First, raise a skill to the point it needs two skill points to be increased, then level up.

When you level up, take two to reduce your Intelligence greatly. This will correspondingly lower your skills involving Intelligence (Science, Repair, Outdoorsman, Doctor, etc). Now allocate your skill points to the skill you want raised - since the skill's value has been lowered, it will take only one skill point to do so. Then rest for a few hours. When the Psycho wears off, Intelligence will be restored, and the skill will be given a significant boost. This is particularly useful for getting a 121% Science skill to recruit Skynet without taking Mentats or wasting too many skill points.

Locations
Psycho is very common in the capital wasteland, and sometimes sold secretly by shady merchants. There are around 60 in guaranteed locations.
 * At least one dose can be found in Silver's house, slightly northeast of Vault 101
 * Around 3-4 doses can be found in the Super Duper Mart
 * Is frequently found in Raider establishments
 * It is sold by Doc Hoff, Cindy Cantelli, Ahzrukhal, Leo Stahl and sometimes by doctors.
 * Three can be stolen from Rivet City's chem shop, A Quick Fix.
 * Four can be stolen from Cantelli's Room in Rivet City.
 * Can be found on the dead bodies of Wastelanders.
 * Can be found on the corpses of Talon Company Merc.