Schedule classification (I–V). Every other topic in this quiz assumes you can place a medication in its schedule quickly. Schedule I has no accepted medical use in the U.S.; Schedule II has high abuse potential with accepted medical use and no refills; Schedules III–IV allow refills with real restrictions; Schedule V is the least controlled, and some products may be sold without a prescription depending on state law.

DEA registration, including how a DEA number is actually verified. Most study material stops at “pharmacies check the DEA number is valid” without explaining what that means. The number itself carries a checksum: add the 1st, 3rd, and 5th digits; separately add the 2nd, 4th, and 6th digits and double that sum; add the two results together, and the last digit of that total should match the 7th digit of the DEA number. A prescriber’s registrant type also matters independently of the checksum.

Prescription requirements: refills, partial fills, and validity. Schedule II prescriptions cannot be refilled and, in most cases, cannot be filled in partial installments beyond narrow emergency and long-term-care exceptions. Schedules III and IV allow up to five refills within six months from the date written, provided the prescriber authorized refills. A valid controlled substance prescription also requires specific elements — patient information, drug name, strength, quantity, directions, and prescriber DEA number among them.

Corresponding responsibility and red flags. This is where the technician’s role and the pharmacist’s role diverge. Technicians are trained to notice red flags — unusual quantities, early refill requests, cash payment for a typically-insured drug, prescribers practicing outside their usual specialty — but the judgment call on whether to fill sits with the pharmacist. Questions here often test whether you know where that line is, not just whether you can spot the red flag itself.

Transfers and multi-state considerations. Schedule III–V prescriptions can generally be transferred between pharmacies once, unless the pharmacies share a real-time online database, in which case additional transfers may be permitted up to the remaining refills. Schedule II prescriptions are not transferable between pharmacies at all. Interstate transfers add another layer, since receiving pharmacists must document specific information at the time of transfer.