Schedule M of the Drugs and Cosmetics Rules, 1945 sets the Good Manufacturing Practice requirements for pharmaceutical manufacturers in India. The Ministry of Health and Family Welfare notified a substantially revised Schedule M at the end of December 2023, replacing a text that had changed little in two decades.
Larger manufacturers were given a short transition period. Micro, small and medium enterprises were given longer, and that deadline was later extended for firms that submitted an upgrade plan to the regulator. Those transition periods have now run out: Revised Schedule M is in force for every manufacturer, large or small, and State Licensing Authorities and CDSCO inspect against it.
Always check the current notification and any CDSCO clarifications for your product category. This article summarises the direction of the requirements; it is not a substitute for the regulation text.