I am never failed to be amazed at the amount of people who request important legal information from Internet forums. You should never rely on information given by people who are not qualified to give it. This could land you in serious trouble. If I were to tell you it's perfectly ok to roll up to the UAE with suitcases of codeine and you were pulled up by the Police, do you think they would except your excuse that BM off of Dubai Forums said it was ok?
Please make your enquiries with the relevant authorities. Google is wonderful. Here is a link I found in 5 seconds.http://www.dubai.ae/en/Lists/HowToGuide ... .aspx?ID=6
Be very careful in Dubai. It is very easy to fall foul of the law if you don't do your research. Good luck.