|For the Rad-X that appear in the Fallout series, see Rad-X.|
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|
- Four in the Takoma Park, crater.
- Four in Evergreen Mills bazaar.
- Six in the National Guard depot, the armory.
- Eight in Wheaton armory.
- Four in Rivet City's hangar.
- Five in Vault 106's living quarters.
Fallout: New Vegas
- Two in the Searchlight NCR storage, on the shelves.
- Three in the Aerotech tent, in the Aerotech Office Park.
- Seven in the REPCONN test site's research labs.
- Two in the Searchlight police station.
- Three in Charleston Cave.
- Fifteen in Vault 34.
No combination of Rad-X and radiation-resistant clothing will grant 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, meaning the player will never be able to survive longer than 16 minutes and 40 seconds without the use of a radiation removal item (or 17 minutes 32 seconds with the Rad Absorption perk).