My youngest drank quite a bit of Dimetapp (which will also sedate) when he was about 3. He thought it was grape juice. He also swallowed a mouthful of bleach once. He also chewed through a glow necklace and got the glowing liquid stuff in his mouth, eyes, up his nose. There was never a dull moment with him.
Sedation for younger kids would most likely be in a liquid form, not injected and not in pills that would have to be swallowed whole. Geez, Dimetapp and Benedryl can knock a kid out, it wouldn’t even have to be a prescription drug. I agree that some kids will eat pills. Many look like Redhots or Sweetarts to a kid. And if you have one like mine, they’ll try anything.
From what some friends tell me getting prescription drugs through customs into a foreign country and getting them back into USA is quite the hassle if they brought a sedative in it would be recorded at customs I bet. If they got through a local doctor should be a paper trail.