RadAway is an intravenous chemical solution that bonds with radioactive particles and removes them from the user's system. While Rad-X is designed to increase the body's natural resistance to radiation, RadAway is designed to be used after exposure. Purging the body of radiation takes some time complete, and anyone using it will experience its adverse effects: It's a potent diuretic and can cause nausea, diarrhea, stomach pains and headaches.
Camp Searchlight contains eight RadAway, including one on a shelf left of the terminal in the NCR storage room, two on a shelf within the first room of the firehouse, three in a duffle bag next to a bed located on the second floor of the firehouse, and two in the broken lockers within the bathroom of the firehouse's second floor.
Contrary to RadAway being quite plentiful in Fallout 3, RadAway in Fallout: New Vegas is much less common, as most shops only have one to three 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, the Free Radical perk will be gained, 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).
↑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."
↑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."