Behind an average locked door in the Vault 3 recreation area there is a stockpile of many medical supplies including 3 RadAway.
Camp Searchlight contains 8 RadAway: 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. You can only access the fire house if you have activated 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.
An effectively unlimited supply of RadAway can be obtained from Sierra Madre vending machines, provided the player has a sufficient amount of chips and has installed the Radaway Holotape.
Contrary to RadAway being quite plentiful in Fallout 3, RadAway in Fallout: New Vegas 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. This is due to the fact that areas with radiation are far less prevalent than in the Capital Wasteland.
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, enhancing the effectiveness of RadAway.
RadAway bears a striking resemblance to a real-world unit of fresh frozen plasma (which would be a viable medium for such a chemical).