For a Br Eng speaker, the answer would be τα ναρκωτικά and τα φάρμακα would be medicines. I say this because a Greek speaker arriving in Britain who tells the customs man that he has "drugs in his suitcase" instead of medicines might spend an uncomfortable hour waiting to be checked out!
See here for the definition of "drugs"...
The first definition of "drugs" is "medicine". We call a store that sells medicine a drugstore.