You can check MIMS. (http://mims.com/) It's a book that lists all the drug products per pharmacological category and usually they're registered with FDA. A section is dedicated to listing of new molecules or new drug products. Hope this helps.
FDA also publishes an yearly data of approved drugs on "fda.gov" (i.e. the official website) but that will be year oriented and so mixed therapeutic categories will be found.
You can also check the "Orange Book" published by USFDA, which lists approved drug products. This allows search by active ingredients, proprietary names, dosage form, applicant etc.