Answer:
Assuming you're talking about taking them with you on board a plane. The safest way - would be to obtain a letter from your doctor before you travel - stating you have been prescribed the medication. It should carry the official stamp of his practice and letterhead - including contact details in case customs needs to verify anything. The medication should be in its original packaging not an un-labelled container. The original packaging will likely contain a label from the pharmacy that dispensed the medication. Again - this should have contact information for the pharmacy. Above all - declare your medication when you leave the country - and when you enter your destination. If you don't declare it - you could end up with it being confiscated !