I went to France for a few weeks in about 2006. I was on enbrel, and just took a couple of shots with me on the plane, in a small cooler (just asked for more ice on the plane when needed). I had copies of the original prescription as well as a note and contact info from my doctors stating the drug was necessary for me. I didn't have any problems at all bringing it into France with that documentation. Have a great trip!
