With p4 and just keep it in the bag/box with the original rx label...that is all you need. If you don't have the rx label then get a dr note. In 4 times flying I only got checked once and it was for the ice pack!!! The tsa guy said thank you for keeping the meds with the rx label, that was all that was needed. And btw I also traveled with hcg needle and pregnyl bottles with only the rx label no dr note and they were more concerned about the ice pack for the p4...didnt even check the needle or hcg!!