Xan is a term that is commonly used as a shortened form of "Xanax," which is the brand name for the drug alprazolam, a benzodiazepine medication used to treat anxiety and panic disorders. It is important to note that Xanax is a federal controlled substance due to its potential for abuse and dependence, and it should only be used as prescribed by a healthcare provider. The term "xan" is often used in informal or slang contexts, particularly in conversations between teenagers or young adults, and it is associated with recreational use and misuse of the drug.