Two is fine but the people joking about popping a handful of those are almost certainly destroying their liver if they are serious. The Codeine may be harmless in higher that recommended doses but the Paracetamol can and will completely and irrevocably destroy the liver.

As for security, TSA could care less. US Customs could generally care less in reasonable quantities. Even overseas I have had a full on Colombian Army carryon hand search where they never looked twice at my unlabeled pill bottle filled with miscellaneous pills. The only thing that really makes me paranoid is pills that could be mistaken for Extacy in some countries.