Schedule M outlines Good Manufacturing Practices (GMP) that must be followed by pharmaceutical manufacturing units in India. It contains requirements for factory premises, plants, equipment, and quality assurance to ensure products are consistently manufactured and controlled to quality standards. Schedule M has two parts - Part 1 covers GMP for premises and materials, and Part 2 covers specific plant and material requirements. It provides detailed guidelines for facilities, equipment, sanitation, personnel, documentation, manufacturing, quality control, distribution, and more to help ensure therapeutic goods produced meet the required quality standards.