Controlled Substance Schedules: Complete PTCB Guide

Understanding Controlled Substance Schedules

The Controlled Substances Act (CSA) classifies drugs into five schedules based on their medical use, abuse potential, and likelihood of causing dependence. Understanding these schedules is one of the most heavily tested topics on the PTCB certification exam. Pharmacy technicians handle controlled substances daily and must know the rules for each schedule.

Schedule I (C-I)

Characteristics: High abuse potential, no currently accepted medical use in the US, lack of accepted safety for use under medical supervision.

Examples: Heroin, LSD, ecstasy (MDMA), peyote, marijuana (federally, though state laws vary).

Pharmacy handling: Schedule I substances are not dispensed by pharmacies. They are available only for approved research purposes with a special DEA registration.

Schedule II (C-II)

Characteristics: High abuse potential with severe psychological or physical dependence.

Examples: Oxycodone (OxyContin), hydromorphone (Dilaudid), morphine, fentanyl, amphetamine salts (Adderall), methylphenidate (Ritalin, Concerta), methadone, hydrocodone combination products.

Key rules:

• No refills permitted: A new prescription is required each time
• DEA Form 222: Required for ordering from distributors
• Secure storage: Must be kept in a locked cabinet or dispersed throughout stock
• Emergency dispensing: Limited quantity with a verbal order, followed by a written prescription within 7 days
• Partial fills: Allowed with specific documentation requirements

Schedule III (C-III)

Characteristics: Moderate to low abuse potential, moderate or low physical dependence, high psychological dependence.

Examples: Testosterone, anabolic steroids, codeine combinations with less than 90 mg per unit (Tylenol #3), buprenorphine (Suboxone), ketamine.

Key rules:

• Up to 5 refills within 6 months of the original prescription date
• Can be called in, faxed, or e-prescribed
• Ordered through regular wholesale channels (no DEA Form 222 required)

Schedule IV (C-IV)

Characteristics: Low abuse potential relative to Schedule III.

Examples: Alprazolam (Xanax), diazepam (Valium), lorazepam (Ativan), zolpidem (Ambien), tramadol, carisoprodol (Soma).

Key rules:

• Same refill rules as Schedule III: 5 refills within 6 months
• Same ordering and prescription requirements as Schedule III

Schedule V (C-V)

Characteristics: Lowest abuse potential among controlled substances.

Examples: Cough preparations with small amounts of codeine (Robitussin AC), pregabalin (Lyrica), lacosamide (Vimpat), diphenoxylate/atropine (Lomotil).

Key rules:

• Same refill rules as Schedules III and IV
• Some states allow OTC dispensing with pharmacist supervision and documentation

Universal Controlled Substance Requirements

• Biennial inventory: Complete controlled substance inventory every 2 years
• Record keeping: Records must be maintained for at least 2 years (some states require longer)
• Theft or loss: Report to DEA using DEA Form 106
• Destruction: Use DEA Form 41 with authorized witnesses
• Prescriber DEA number: Required on all controlled substance prescriptions

PTCB Exam Preparation

Memorize example drugs for each schedule, know the refill rules, and understand DEA form requirements. These are among the most predictable PTCB exam questions. Practice at PTCBprep and review at your dashboard.