The Vault - Fallout Wiki

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The Vault - Fallout Wiki
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For Rad-X as it appears in the Fallout series of games, see Rad-X.
FO3 Rad-X.png
Icon Rad-X.png
+25 Radiation Resistance for 4 miuntes
Base ID00015168

Rad-X is a consumable item in Fallout 3.


Main article: Rad-X

A potent anti-radiation medicine that bolsters the user's natural radiation resistance. Taking it prior to exposure is recommended, as it can greatly reduce irradiation, particularly when combined with advanced radiation suits.[1][2]


Rad-X is an anti-radiation chemical that can significantly reduce the danger of irradiated areas. When combined with an advanced radiation suit, Rad-X can—even at moderate medical skill levels—create near-immunity to radiation.

Rad-X is best used in heavily irradiated areas. It is reasonably common and can be used frequently. Like stimpaks and RadAway, Rad-X is non-addictive, and its effectiveness is controlled by the medicine skill. Taking multiple doses of Rad-X does not increase the total radiation resistance (the effects do not stack). Instead, the drug's active time is lengthened (the effective time stacks).

Effects of Medicine skill

10+30 Radiation Resistance60+55 Radiation Resistance
20+35 Radiation Resistance70+60 Radiation Resistance
30+40 Radiation Resistance80+65 Radiation Resistance
40+45 Radiation Resistance90+70 Radiation Resistance
50+50 Radiation Resistance100+75 Radiation Resistance


  • Rad-X is commonly found in first aid kits scattered around the wasteland.
  • It can be bought from merchants that carry medicine.
  1. Vault Dweller's Survival Guide p.5-18: "Rad-X is a preventive medication. Take Rad-X before exposure to radiation, and the total amount of radiation you receive will be reduced. Rad-X bolsters your bodies own Radiation Resistance. The stronger you are to start with, the more effective Rad-X will be."
  2. Fallout Official Survival Guide p.124: "Rad-X: A radiation prophylactic. Use this drug before you enter a radioactive area, and the total amount of radiation you receive will be reduced. Rad-X increases your body's natural Radiation Resistance."