When storage recommendations are not provided by the manufacturer, which reference may be used for guidance?

• A. Internal policy
• B. USP Drug Substance Monographs and Excipients
• C. Manufacturer's outdated manual
• D. Internet blogs

Answer: (B)

When storage conditions aren’t provided by the manufacturer, rely on authoritative pharmacopoeial standards for guidance. The USP Drug Substance Monographs and Excipients include official storage and stability information for drug substances and excipients, reflecting validated conditions that help preserve potency, quality, and safety. These monographs are widely recognized by industry and regulators, making them the most reliable source to consult in absence of manufacturer data.

Internal policies may govern operations but don’t supply substance-specific stability data. An outdated manual can be obsolete, and internet blogs aren’t reliable sources for pharmaceutical storage guidance. If needed, you can also consult USP general stability and storage chapters or other recognized pharmacopoeias for additional confirmation.