How often is a controlled substances inventory required?

• A. Every year
• B. Every 3 years
• C. Every 2 years
• D. Every 4 years

Answer: (C)

Biennial inventories are required, meaning every two years. This practice ensures an up-to-date, verifiable count of all controlled substances and helps detect theft, loss, or diversion. Under federal regulations, an initial inventory is done when first registered, and then a complete inventory must be taken at least every two years. For Schedule II drugs, the inventory must be a physical count; for Schedule III–V, you may use either a physical count or an estimate. Record the inventory date and include each drug’s name, strength, dosage form, and quantity, and keep these records for the required retention period.