Rule 161-B of the Drugs and Cosmetics Act was amended to require Ayurvedic medicines to display a maximum shelf life or expiration date, determined based on scientific stability testing data. The rule outlines standardized shelf life periods for different Ayurvedic dosage forms and requires manufacturers to conduct real-time stability studies according to guidelines and submit scientific evidence to support the labeled shelf life. The changes aim to improve quality, packaging, labeling and storage of Ayurvedic medicines by establishing standardized practices and shelf life periods backed by stability testing data.