Is there anywhere that can tell me whether medicines have opiates in them or not?

I found out last year that I have a severe allergy to morphine and other opiates. However, the doctors never told me what medicines to avoid, and after nearly taking codeine (which I'm told can sometimes be a lot stronger than morphine when taken in tablet form), I need to find a site or a book that can tell me what medicines to avoid. Does anyone know of anything like that?

: http://alcoholdrugstreatment.info/is-there-anywhere-that-can-tell-me-whether-medicines-have-opiates-in-them-or-not