Xanax
Sure they will help a hangover but they don't exactly grow on trees especially in the US where you can only get them with a prescription or take your chances on the street with a drug dealer. Even here is Costa Rica you need a script to buy any in a pharmacy. Also if you are not used to them be careful as they can get you pretty stoned, so give someone your keys until you are straight again. 2 half milligram tablets will do the trick for a non-user.
FYI - Side effects of Xanax may include:
Decreased libido, drowsiness, fatigue, impaired coordination, memory impairment, speech difficulties, weight changes. The drug can be addictive but if only used on rare occasions in your own home where you can rest that should not be a problem. Don't ever use Xanax behind the wheel or even walking in the street is my advice.
wil.