I am flashing back to the nightmare I experienced in Poland where, despite it being in its original container, not remotely a controlled substance in Poland, a clueless Polish security person attempted to confiscate my THYROID medication (without which I get very sick indeed) when I attempted to board my flight to leave. So even if you do follow all the rules, you can run into issues.

But always check, always keep your prescription medication in its original container, etc. It's also generally a good idea to talk to your doctor before traveling anywhere outside Europe and North America anyway, in case you need extra vaccinations, proof of vaccination, etc.