Rad-X (Fallout 3)

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For the Rad-X that appear in the Fallout series, see Rad-X.

Rad-X is a chem in Fallout 3 and Fallout: New Vegas.

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 create near-immunity to radiation, even at moderate medical skill levels.


Rad-X 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).

Medicine skill effect

10+30 % Radiation resistance for 4m
20+35 % Radiation resistance for 4m
30+40 % Radiation resistance for 4m
40+45 % Radiation resistance for 4m
50+50 % Radiation resistance for 4m
60+55 % Radiation resistance for 4m
70+60 % Radiation resistance for 4m
80+65 % Radiation resistance for 4m
90+70 % Radiation resistance for 4m
100+75 % Radiation resistance for 4m

Notable locations

Fallout 3

Fallout: New Vegas


No combination of Rad-X and radiation resistant clothing will grant a total immunity to radiation, as Radiation Resistance caps off at 85%. Any irradiated area will, at the very least, have a persistent +1 rads effect even at the highest levels of radiation resistance.

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