RadAway (Fallout)

In Fallout, Fallout 2 and Fallout Tactics, interestingly RadAway can be addictive. It takes full effect only after 4 hours.

RadAway is also one of these games' higher-value items, and since you'll find far more than you'll ever realistically use, it is very good for making money.

Fallout

 * Vance in the Hub
 * Inside Ice Chest in the Followers of the Apocalypse library

Fallout 2

 * Sajag in Klamath
 * Toxic Caves

Related quests

 * RadAway is needed for the Help Charlie unmarked quest in Fallout 2