Slasher

 is a consumable item in Fallout: New Vegas.

Characteristics
This item is made at a campfire if you have a Science skill of 50. It requires: Banana Yucca Fruit (2), Psycho (1), and Stimpak (2). It essentially combines the effects of Med-X and Psycho into a single drug except it is possible to combine the effects of this drug with previously mentioned ones to gain a whopping 50% boost to both damage resistance and damage.

it will only stack with med-x but not psycho.Therefore you can only get 25% damage bonus even you use both of slasher and psycho.

Locations
The only place that Slasher can be found in the wild is from Jack, in Red Rock Canyon, after teaching him the recipe.

Appearances
only appears in Fallout: New Vegas.