However, by the early 1960s, rapid advancements in pharmaceutical science, the introduction of new drugs, and feedback from manufacturers and analysts highlighted the need for a revised and expanded set of standards. This led to the decision to publish a second edition.
If you are researching historical drug standards, note that the 1966 edition (along with its 1975 supplement) is the correct reference for drugs marketed in India during the late 1960s and 1970s. 2nd edition indian pharmacopoeia publication year