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2.1 DEA Regulations and Controlled Substance Schedules

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PTCE Pharmacy Technician Certification Exam

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1 Introduction

About the PTCE How to Use This Guide

2 Chapter 1: Medications

1.1 Generic and Brand Drug Names & Classifications 1.2 Cardiovascular and Anticoagulant Medications 1.3 Anti-Infective and Analgesic Medications 1.4 Endocrine, Respiratory, CNS, and Storage Requirements

3 Chapter 2: Federal Requirements

2.1 DEA Regulations and Controlled Substance Schedules 2.2 Drug Supply Chain Security Act (DSCSA) 2.3 FDA Regulations and Drug Recalls 2.4 HIPAA, CMEA, and Prescription Requirements

4 Chapter 3: Patient Safety and Quality Assurance

3.1 Medication Error Prevention 3.2 High-Alert and Look-Alike/Sound-Alike Medications 3.3 Patient Counseling and Communication 3.4 Quality Assurance and Continuous Quality Improvement

5 Chapter 4: Order Entry and Processing

4.1 Prescription Interpretation 4.2 Pharmacy Calculations 4.3 Inventory Management and NDC Numbers 4.4 Insurance, Billing, and Prescription Processing

2.1 DEA Regulations and Controlled Substance Schedules

Key Takeaways Explain This Topic AI

The DEA enforces the Controlled Substances Act (CSA) of 1970, classifying drugs into five schedules (I-V) based on abuse potential and medical use.

Schedule I drugs (heroin, LSD, MDMA) have high abuse potential and NO accepted medical use federally.

Schedule II drugs (oxycodone, fentanyl, Adderall) have high abuse potential but accepted medical use; NO refills allowed.

Pharmacies need a DEA registration number (renewed every 3 years) to handle controlled substances.

All DEA Form 222s for Schedule II orders must be retained for 2 years; electronic ordering (CSOS) is increasingly common.

Last updated: November 2026

Quick Answer: The DEA classifies controlled substances into Schedules I-V based on abuse potential and medical use. Schedule II drugs require a new prescription each time (no refills), while Schedules III and IV allow up to 5 refills within 6 months (the federal refill limit does not name Schedule V). Pharmacies must maintain a DEA registration (renewed every 3 years) and keep controlled substance records for at least 2 years.

The Drug Enforcement Administration (DEA) enforces the Controlled Substances Act (CSA) of 1970, which established the federal framework for regulating drugs with potential for abuse.

The Five Controlled Substance Schedules

Schedule Abuse Potential Medical Use Prescription Requirements Examples

Schedule I Highest None accepted (federally) Cannot be prescribed Heroin, LSD, MDMA, marijuana outside FDA-approved products and state medical marijuana licenses*

Schedule II High Accepted Written/electronic Rx, NO refills Oxycodone, fentanyl, Adderall, Ritalin

Schedule III Moderate Accepted Written/oral/faxed Rx, 5 refills in 6 months Tylenol with codeine, testosterone, ketamine

Schedule IV Low Accepted Written/oral/faxed Rx, 5 refills in 6 months Xanax, Valium, Ambien, tramadol

Schedule V Lowest Accepted Written/oral/faxed Rx; the federal 5-refill, 6-month limit (21 CFR 1306.22) covers only Schedules III and IV Cough syrups with codeine, Lyrica

*Note on marijuana: Since April 28, 2026, marijuana in an FDA-approved drug product and marijuana under a state medical marijuana license are Schedule III; other marijuana remains Schedule I (DEA final rule, 91 FR 22714). The PTCE tests federal law.

  • Key Rules by Schedule
  • Schedule II Requirements (Most Strictly Controlled)
  • No refills allowed — new prescription required each time
  • Written, electronic, or faxed prescription (fax only in emergencies or specific situations)
  • Prescriber must have DEA number registered for Schedule II

Partial fills allowed if the pharmacy cannot supply the full quantity (remainder within 72 hours; otherwise notify the prescriber)

Patient- or prescriber-requested partial fills (21 CFR 1306.13(b), amended July 21, 2023): allowed if state law does not prohibit it and the total dispensed does not exceed the quantity prescribed; remaining portions must be filled within 30 days of the date written (72 hours for an emergency oral prescription)

Long-term care facility or terminally ill patients may receive partial fills; the prescription is valid for up to 60 days from the issue date

Schedules III-V Requirements

Up to 5 refills within 6 months of the date issued for Schedules III and IV (21 CFR 1306.22); the federal limit does not name Schedule V, so check state law

Oral prescriptions permitted (pharmacist must document)

Transfer of prescriptions for refills allowed one time between pharmacies; pharmacies sharing a real-time online database may transfer up to the maximum refills (21 CFR 1306.25)

DEA Registration Requirements

  • Requirement Details
  • Who needs DEA registration Pharmacies, prescribers, manufacturers, distributors
  • Registration renewal Every 3 years
  • Separate registration Required for each location (no blanket registrations)
  • DEA number format 2 letters + 7 digits (e.g., AB1234567)
  • DEA Number Verification

Pharmacy technicians should know how to verify a prescriber's DEA number:

  • First letter : Registrant type (A, B, or F for practitioners; M for mid-level practitioners)
  • Second letter : First letter of prescriber's last name

Checksum calculation : Add 1st, 3rd, and 5th digits; add 2nd, 4th, and 6th digits and multiply by 2; sum both results — last digit should match 7th digit

  • Ordering Controlled Substances
  • Schedule II Ordering

DEA Form 222 (single-sheet paper form, mandatory since October 30, 2021; the purchaser keeps a copy and sends the original to the supplier) OR

  • CSOS (Controlled Substance Ordering System) — electronic ordering with digital certificate
  • Schedules III-V Ordering
  • Standard invoice/purchase order acceptable
  • No special DEA form required
  • Recordkeeping Requirements
  • Record Type Retention Period
  • DEA Form 222 2 years
  • Controlled substance invoices 2 years
  • Biennial (every 2 years) inventory 2 years
  • Prescription records 2 years (many states require longer)

Important : Controlled substance records must be kept separate from other pharmacy records OR must be readily retrievable (marked with red "C" stamp or similar identifier).