Are you still covered by France's medical system when you are out of the country? Do you have a job here? If so does it have medical benefits as part of your compensation [wage] package?
If you have no job or your job has no medical package, then you will have to pay the cost of the medication yourself. Humira has an assistance program. I do not know if you qualify. You can call 1-800-4HUMIRA and ask. This is the web site: http://www.humira.com/myhumira/financial-assistance.aspx?cid=ppc_ppd_hum_ggl_brand_2832
We will try to explain things to help you. You will have to tell us a little more about
your situation, like if you have a job.