I recently had a medical issue and I need to bring pain killers in case it comes up again while I am in Mexico.

It is codine. I have a letter that lists the drugs I should have but it isn't in spanish (as some website say it should be).

What's my best course of action? Bring it in checked luggage? In hand luggage? Buy condine in Mexico (can it be done over the counter?)

#ASKNOSTR