This is not too relevant to the original query, but just an example of how you can never quite know everything. We returned yesterday from Antarctica. Leaving the Buenos Aires international airport, carry-on luggage is hand searched, often quite thoroughly, at the gate just before you board the flight back to the U.S., Miami in our case. We had experienced this search on an earlier trip, and knew that water and other liquids over 3.2 ounces would be taken away, even if purchased after the main security scan.
Others told us that small bottles of hand sanitizer had been taken away in this search, as a "flammable liquid", so we had put ours in checked luggage.
I had a variety of meds with me, both prescription and non-prescription. These were scrutinized in detail. All were in labelled bottles except some psyllium fiber in capsules, which were in a small plastic bag. The capsules were taken away from me.
I had never read or heard anything about a problem with drugs leaving Argentina, and no one else I talked to had any taken away. So, just a heads up.