Drug Master Files (DMFs) provide confidential information to support drug applications and are submitted voluntarily to the FDA. There are 5 types of DMFs covering manufacturing sites (Type I), drug substances and products (Type II), packaging materials (Type III), excipients (Type IV), and reference information (Type V). DMFs require authorization letters for reference and annual updates to remain open. Distribution records must allow tracing batches and facilitate recalls, with requirements for storage conditions, oldest stock distribution, and records of further distribution by consignees.