Although it is a very good idea to have a physician's statement listing your prescriptions and doses, I will say that I have traveled all over the world with unlabeled meds pre-loaded into those weekly medicine dispensing boxes, and I have NEVER had a problem and have NEVER even been asked about them. Some of the meds are xray dense and certainly would be visible to screeners, but it has just not been an issue anywhere. Longest trip was three weeks with three weeks worth of meds.