I think it would be a good idea to have a doctor's note or at least a copy of your prescription, especially if any of your medication falls under the controlled drugs category. You might not be stopped and asked, but having the paperwork is going to save a lot of hassle if you are.
It's unlikely that you'll have a problem, however to be safe, you should bring a photocopy of your prescription. If the drugs are restricted anywhere you'll be visiting, think about a letter from your doctor.
We have the same issue when we visit Dubai. We've never been asked, however my OH always carries a doctor's letter just in case.