Least suspicious would probably be in whatever package they come in. When I travel with my family, we do usually bring most meds in a zip lock bag and we’ve had zero issues so far though. Anyway it doesn’t typically matter, assuming the meds are not restricted in the country you’re going to. I wouldn’t expect many OTC meds would be.
I guess the readability on the new set is way better. The bills have always been pretty much whatever for me though, I like the coins though. Especially the 1 and 2 euro ones.