Controlled Substance Prescriptions & DEA Schedules
Federal requirements for controlled substance prescriptions (new, refill, transfer) and DEA controlled substance schedules.
Controlled Substance Prescriptions & DEA Schedules is worth 3.2% of the PTCE within the Federal Requirements domain (18.75% overall). It tests the five DEA schedules and the federal rules for new prescriptions, refills, transfers, partial fills, and emergency dispensing. The organizing principle: abuse potential drives the schedule, and the schedule drives what you are legally allowed to do — refill limits, transfer rights, and how a prescription may be transmitted all flow from it.
The Five DEA Schedules
Schedule I has no accepted medical use and a high abuse potential (heroin, LSD, MDMA; marijuana remains Schedule I federally). Schedule II are high-abuse drugs with accepted medical use: oxycodone, hydromorphone, morphine, fentanyl, methylphenidate, and amphetamine (Adderall). Schedule III has moderate potential: buprenorphine, ketamine, anabolic steroids, and codeine/acetaminophen (Tylenol with Codeine #3). Schedule IV includes benzodiazepines (alprazolam, lorazepam), tramadol, carisoprodol, and zolpidem. Schedule V is the lowest — pregabalin, diphenoxylate/atropine (Lomotil), and limited-quantity codeine cough preparations.
Methylphenidate and amphetamine (Adderall) are Schedule II, not III — a frequent exam trap.
Refill Rules by Schedule
Schedule II prescriptions may never be refilled — each fill requires a new prescription. Schedule III and IV prescriptions may be refilled a maximum of 5 times within 6 months of the date the prescription was issued, whichever limit is reached first. Schedule V prescriptions may be refilled as authorized by the prescriber. A Schedule III/IV prescription with no refills marked, once its 6-month window closes, is void even if fewer than 5 fills occurred.
Schedule III/IV: 5 refills max AND within 6 months — hit either limit and the prescription is done.
Emergency Dispensing and Partial Fills
In a genuine emergency, a Schedule II drug may be dispensed on an oral (verbal) order, but the prescriber must furnish a written (or valid electronic) prescription to the pharmacy within 7 days, and the quantity is limited to the amount needed for the emergency period. Under the Comprehensive Addiction and Recovery Act (CARA, 2016), a Schedule II prescription may be partially filled at the request of the patient or prescriber; the remaining quantity may be filled up to 30 days after the prescription was issued (or within 72 hours for an emergency oral Schedule II prescription). The total dispensed can never exceed the amount originally prescribed.
CARA partial-fill window for Schedule II is 30 days from the issue date — not 6 months.
Transfers Between Pharmacies
Historically, controlled substance prescription refills in Schedules III–V could be transferred between pharmacies on a one-time basis (or up to the maximum number of refills if the two pharmacies share a real-time, online database). A DEA final rule effective August 28, 2023 additionally permits a one-time transfer of an electronic controlled substance prescription (EPCS) in Schedules II–V to another pharmacy for the initial fill, at the patient's request. The transfer must occur directly between two licensed pharmacists, and the prescription must stay in unaltered electronic form.
Must-Know for the Exam
- ✓Schedule I = no accepted medical use (heroin, LSD, MDMA, federal marijuana)
- ✓Schedule II examples: oxycodone, fentanyl, morphine, methylphenidate, amphetamine (Adderall)
- ✓Schedule II: no refills, ever
- ✓Schedule III/IV: maximum 5 refills within 6 months of issue
- ✓Schedule V: refills as authorized by the prescriber
- ✓Emergency oral Schedule II must be followed by a written prescription within 7 days
- ✓CARA Schedule II partial fill: remainder filled within 30 days of issue (72 hours if emergency oral)
- ✓A one-time EPCS transfer for initial fill (Schedules II–V) is allowed as of Aug 28, 2023
Common Exam Mistakes
- ✗Misclassifying Adderall/methylphenidate as Schedule III instead of Schedule II
- ✗Stating the CARA Schedule II partial-fill window is 6 months instead of 30 days
- ✗Allowing a Schedule II prescription to be refilled
- ✗Saying an emergency oral Schedule II follow-up prescription is due in 72 hours (that is 7 days; 72 hours applies to an emergency partial fill)
- ✗Applying the Schedule III/IV "5 refills" cap to Schedule II
Quiz yourself on Controlled Substance Prescriptions & DEA Schedules
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Start Controlled Substance Prescriptions & DEA Schedules Practice Quiz →Key Concepts — Part 1
1. How many refills are permitted on a valid Schedule II prescription under federal law?
None - Schedule II prescriptions may not be refilled
Federal law prohibits refills on Schedule II prescriptions entirely; a new prescription is required each time. A describes the Schedule III-V refill limit, not Schedule II. B and D are not accurate under any schedule.
2. What is the maximum federal refill allowance for a Schedule III or IV prescription?
Up to 5 refills within 6 months of the date issued
Schedule III and IV prescriptions may be refilled up to 5 times within 6 months from the date of issue; after that, a new prescription is required. A misapplies the Schedule II rule, and C and D exceed the federal limit.
3. A prescriber wants to authorize a 90-day supply of a Schedule II medication using the multiple prescriptions provision. Which practice complies with DEA rules?
Writing up to three separate prescriptions, each dated with the date issued, with instructions on the later prescriptions indicating the earliest date they may be filled, totaling no more than a 90-day supply
The DEA's multiple-prescription provision allows a practitioner to issue up to a 90-day total supply of a Schedule II drug through several prescriptions written on the same date, each noting the earliest date it may be filled, with no refills. A is invalid since Schedule II cannot carry refills. C and D do not meet the documented, sequential-fill-date requirement of the provision.
4. Under what circumstance may a pharmacist accept an oral (verbal) order for a Schedule II medication?
Only in a bona fide emergency, limited to the quantity needed for the emergency period, with a written or electronic prescription to follow
Federal law permits an oral order for a Schedule II drug only in a genuine emergency, limited to the amount needed to treat the emergency, and the prescriber must provide a written or electronic prescription within the required timeframe afterward. A is too broad, C is not the general federal emergency exception, and D incorrectly states no exception exists.
5. Within how many days must a prescriber furnish a written or electronic prescription to the pharmacy after phoning in an emergency oral order for a Schedule II drug?
7 days
Federal regulation requires the prescriber to provide the pharmacy with a written or electronic prescription within 7 days of authorizing an emergency oral Schedule II order. 24 hours (A) is too short, and 30 days (B) exceeds the requirement; D is incorrect because a specific deadline exists.
6. A Schedule IV prescription with refills remaining was originally filled at Pharmacy A. The patient wants it transferred to Pharmacy B, and the two pharmacies do not share a real-time online database. How many times may this prescription be transferred?
One time only
For pharmacies that do not share a real-time, online database, federal law permits only a single transfer of a Schedule III-V prescription. If pharmacies share a real-time database, additional transfers up to the remaining refills may be permitted. D is incorrect because transfers of III-V prescriptions are allowed under these conditions.
7. Which of the following drugs is federally classified as a Schedule III controlled substance?
Testosterone
Testosterone and other anabolic steroids are Schedule III. Alprazolam (A) is Schedule IV, oxycodone (C) is Schedule II, and heroin (B) is Schedule I.
8. Which of the following drugs is federally classified as a Schedule IV controlled substance?
Lorazepam
Benzodiazepines such as lorazepam are Schedule IV. Buprenorphine (A) is Schedule III, morphine (B) is Schedule II, and marijuana (D) remains Schedule I under federal law regardless of state legalization.
9. Which of the following is required on a legally valid controlled substance prescription?
The prescriber's full name, address, and DEA registration number; the patient's name and address; the drug name, strength, dosage form, and quantity; directions for use; the date issued; and the prescriber's signature
A valid controlled substance prescription must contain specific elements identifying the prescriber, patient, and medication as listed in choice B. The pharmacy's NPI (A), the patient's insurance information (C), and the prescriber's graduation date (D) are not federally required elements of a valid controlled substance prescription.
10. What additional safeguard does federal law require for electronic prescriptions of controlled substances (EPCS) that is not required for electronic prescriptions of non-controlled drugs?
Two-factor identity authentication by the prescriber when signing and transmitting the prescription
DEA regulations for EPCS require prescribers to use two-factor identity authentication when electronically signing controlled substance prescriptions, a safeguard beyond standard e-prescribing. A wet-ink signature (A) is not used in an electronic workflow, notarization (C) is not required, and patient verbal confirmation (B) is not a federal EPCS requirement.
Key Concepts — Part 2
1. Under federal law, may a faxed prescription generally serve as the original when dispensing a Schedule II medication in a standard retail pharmacy setting?
No, except in specific circumstances, such as for a hospice patient, a long-term care facility resident, or to facilitate delivery of a narcotic for infusion, where the fax may serve as the original
Federal law generally does not allow a faxed copy to serve as the original for Schedule II dispensing, except in specific carved-out situations such as hospice or long-term care patients or narcotics for IV infusion, where the fax itself may serve as the original prescription. A overstates the exception, B is not the standard, and D ignores the recognized exceptions.
2. A pharmacist has only enough stock to partially fill a Schedule II prescription because the full quantity is unavailable. Under general federal rules, when must the remaining quantity be dispensed?
Within 72 hours of the initial partial fill, or the remaining portion of the prescription becomes void
When a Schedule II prescription is partially filled because the pharmacy cannot supply the full quantity, federal rules generally require the remainder be dispensed within 72 hours, after which the balance may not be filled. C describes a different partial-fill scenario, and A and B do not reflect the applicable federal standard for a supply-shortage partial fill.
3. Under federal rules updated by the Comprehensive Addiction and Recovery Act (CARA), a patient or prescriber may request that a Schedule II prescription be partially filled over time. Within what period from the date of issue must these partial fills be completed?
30 days
CARA allows a Schedule II prescription to be partially filled at the request of the patient or prescriber, with the remaining portion filled no later than 30 days after the date the prescription was written. This differs from the 72-hour rule (A), which applies specifically when a fill is partial due to the pharmacy's insufficient supply, not a planned, requested partial fill.
4. A prescriber writes a prescription for a Schedule I substance for a retail pharmacy patient. What is the correct disposition?
Schedule I substances have no FDA-accepted medical use and are not legitimately dispensed via prescription in standard retail pharmacy practice
By definition, Schedule I substances have no accepted medical use in the United States and lack an accepted safety profile for use under medical supervision, so they are not legitimately prescribed or dispensed in retail pharmacy. Options A, C, and B all incorrectly imply a Schedule I substance can be routinely dispensed.
5. What does corresponding responsibility mean in the context of dispensing controlled substances?
The prescriber and the pharmacist share a joint legal duty to ensure a controlled substance prescription was issued for a legitimate medical purpose
Corresponding responsibility means the pharmacist shares, alongside the prescriber, a legal duty to ensure a controlled substance prescription is legitimate before dispensing. It does not require technician co-signature (B), a patient waiver (C), or shift the duty to insurers (D).
6. A mid-level practitioner, such as a nurse practitioner, wants to prescribe a Schedule III controlled substance. What must they have to do so legally?
A DEA registration number, which for many mid-level practitioners includes a distinguishing suffix indicating their practitioner category
Mid-level practitioners authorized to prescribe controlled substances receive a DEA registration number, often structured with a suffix identifying their practitioner type, with their prescribing authority governed by scope-of-practice and state law alongside DEA registration. A medical license alone (A) is not sufficient federally, a pharmacist's note (C) is not a substitute for DEA registration, and per-prescription board approval (B) is not how this works.
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