This document discusses 505(b)(2) applications, which are a type of new drug application that relies in part on investigations not conducted by the applicant. It provides examples of 4 drugs - Bendeka, Zuplenz, Avycaz, and Narcan - that received FDA approval through 505(b)(2) applications. For each drug, it notes the active ingredient, when the 505(b)(2) was approved, the old and new dosage forms, and intended uses. The document concludes with two references on 505(b)(2) applications.