Official announcement released by Government of India via Press Information Bureau (PIB). New Delhi, Nov 4 (PTI) The Union Health Ministry has proposed amendments to Schedule M of the Drugs Rules, 1945, to align microbial contamination limits in Grade A clean areas of sterile. The government on Wednesday said it has proposed amendments to Schedule M' of the Drugs Rules 1945, to revise the prescribed limits for microbial contamination in Grade A.