This document provides an introduction to regulatory affairs and good regulatory practices. It defines regulatory affairs as the interface between the pharmaceutical industry and drug regulatory authorities, and notes that regulatory affairs is involved in all stages of medicine development and post-marketing activities. The document then discusses the roles and responsibilities of regulatory professionals in liaising with health authorities, ensuring regulatory compliance, and managing product life cycles. It also outlines principles of good regulatory practices such as legality, impartiality, consistency, and transparency.