The document discusses the FDA's Inactive Ingredient Guide (IIG), which lists inactive ingredients that are present in approved drug products. It provides information on obtaining the IIG and describes the contents and purpose of the guide. The IIG is intended to help identify inactive ingredients that may require less extensive review if they are already present in approved drug products for a particular route of administration. It lists ingredients alphabetically and provides information like routes of administration, CAS numbers, number of NDAs, and potency ranges.