Humira (generic name is Adalimunab) is a "Biologic." So is Remicade.
There are two clashing schools of thought: a) start with least toxic but also potentially least effective meds first (mesalamine/antibiotic, etc.) and then, if necessary working up the pyramid toward stronger meds like Imuran and after that, biologics or b) start with strongest possible meds even though the potential for toxicity is greater.
The most fierce proponents of choice "b" tend to be the gastros promoting biologics as first-line therapy.
The following link goes to Johns Hopkins and supplies more info about the pyramid, biologics, and other therapies:
http://hopkins-gi.nts.jhu.edu/pages/latin/templates/index.cfm?pg=disease4&organ=6&disease=21&lang_id=1