For all medication it is a good idea to carry a note from your GP detailing what medication you are on and why you are taking it. You should be aware that if you take anti-depressants or prescription pain medication that these are illegal in some Central Asian countries like Uzbekistan and could be confiscated on arrival. Unfortunately, it is also the case that legal medication could be confiscated through lack of education or because the official is simply being overzealous.