AB: Drugs that have been proven to meet the necessary bioequivalence
requirements
through in vivo and/or in vitro testing compared to a reference standard that is
currently
approved. AB is the most common designation. Drugs coded as AB under a specific
product heading are considered therapeutically equivalent only to other drugs
coded as AB
under that heading. Thus, products in this category are considered to be generic
drugs.
However, an AB-rated product may carry an individual brand name. Under no
circumstances may an AB-rated generic product use the patented brand name of
the
reference standard. http://cme.medscape.com/viewarticle/416390_3