These are the rules the FAA sets for all AMEs. The FAA does regularly update the information, making it impossible to maintain on this site. Click on the link below for some "light reading".
Here you will find new medication updates, new CACIs, policies and procedures that all AMEs have to follow. There is even a AME guide that you may download under RESOURCES (currently 957 pages long) for those brave and curious enough.
Prescription medication concerns can be found here. www.faa.gov/ame_guide/pharm
Over the counter meds. www.faa.gov/pilots/medical_certification/media/OTCMedicationsforPilots.pdf