i know that some antibiotics can have effects on your pill's effectiveness. (nicely worded, eh? hehe) but i was wondering, do over-the-counter drugs do that too? i've had a bad cold lately and been taking claratin, ibuprofen and some cough pills. what kinds of drugs actuallly "mess it up" though? and does it cause the pill to be totally ineffective? would you consider it a missed pill? lol, i'm totally clueless on this. thanks :-D