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I really don't know what is in the medicine to cause such red circle concern, I think it's a warning that you shouldn't. Ha, would make the search for easily available doping substances nice and quick if all one had to do is look for packets without that sign on it!
I have just asked my host here and they say it's not on all medicines, but it is because of the famous cases here in Italy regarding doping in the past that it is printed on most packets.
So is that saying it's not a doping substance or that it is and you mustn't use it for doping? :)