Be careful if you are carrying it into some of the Middle Eastern countries. Check the rules online first. Also, be mindful of places like Singapore - I cannot remember the current rules, but I avoided taking it with me when I last went there a few years ago, just to be cautious.
Some South East Asian countries have the odd strange law as well - eg. in Laos, it is illegal for a foreigner to have sex with a local. So, I guess being stopped at the airport there with some V in your bag may require some explaining.
Take a copy of the prescription with you just to be sure.