One of the marvels of pre-War medical science, RadAway is a biomedical solution designed to bond with radioactive particles and remove them from the user's system. It effectively purges the body of radiation, but has nasty side effects, including nausea, diarrhea, stomach pains, and headaches. It has to be applied intravenously to work, making it a scary prospect for those afraid of needles.
This item looks similar to a blood pack, except with a short tube and a distinctive orange color. The effectiveness of RadAway is dependent on the medicine skill, meaning that the higher the player's medicine skill, the more Rads are removed.
Vault 34 has a small stockpile of RadAway and Rad-X in a safe in the clinic. This is very useful as Vault 34 is flooded with light radiation.
RadAway is available for purchase at most drug stores in the game and many merchants carry it [examples] Doc Mitchell's in Goodsprings- Mick & Ralph's etc. Dr. Kemp in Camp McCarran stocks 8.
Behind an average locked door in the Vault 3 recreation area there is a stock pile of many medical supplies including 3 RadAway.
Camp Searchlight contains 8 RadAways: 1 on a shelf left of the terminal in the NCR storage Room 2 on a shelf within the first room of the firehouse. 3 in a duffle bag next to a bed located on the second floor of the firehouse. 2 in the broken lockers within the bathroom of the firehouse second floor. (note) you can only access the fire house if you have activate the quest Wheel of Fortune.
After completing the quest High Times for the followers, you can speak to Julie Farkas and you may choose to get a stimpak, RadAway or a Fixer. You can get one item from her per day.
After the completion of Dead Money, the vending machine in the abandoned Brotherhood of Steel bunker can be used whenever the player desires so long as the player has Sierra Madre chips, a supply of which is available from a wall safe in the bunker.
High Times - RadAway is needed to help Bill Ronte kick his addiction, the character will need a Speech level of 50 or a Science skill of 50 and 2 Fixer and 1 whiskey. If the character's Speech and Science levels are too low, then RadAway (1) will been needed as well as the 2 Fixer and 1 whiskey.
In Fallout: New Vegas, RadAway is much less common as most shops only have 1 to 3 in stock if any at all, though it is often stocked by doctors.
RadAway heals radiation over time in hardcore mode, instead of instantly in normal mode.
RadAway glows even brighter than in Fallout 3, making it easy to locate.
After taking 20 doses of Rad-Away, you will be granted the Free Radical perk, that enhances the effectiveness of RadAway.
↑Vault Dweller's Survival Guide p.5-18: "If you have been exposed to large amounts of radiation, then use RadAway to remove the radiation from your system. It won’t feel good, but better a headache and some stomach problems for a couple of days than the long term effects of nuclear radiation! RadAway takes a little while to work."
↑Fallout Official Survival Guide p.124: "RadAway: Used after you have taken radiation damage, this drug will remove some of the contamination from your system. It takes time for the effects to work. There is a chance of developing an addiction to this drug."