← Drug Classifications – PTCB Pharmacy Technician Certification

PTCB Pharmacy Technician Certification Study Guide

Key concepts, definitions, and exam tips organized by topic.

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Drug Classifications – PTCB Pharmacy Technician Certification Study Guide


Overview

Drug classification is a foundational competency for pharmacy technicians, covering DEA controlled substance schedules, therapeutic drug classes, pregnancy safety categories, and regulatory handling requirements. Mastery of these topics is essential for the PTCB exam and for ensuring patient safety and legal compliance in daily pharmacy practice. Understanding drug name suffixes, scheduling rules, and dispensing restrictions will appear repeatedly on the certification exam.


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DEA Controlled Substance Schedules


Overview of the Schedule System

The DEA classifies controlled substances into five schedules based on medical use, abuse potential, and likelihood of dependence. Each schedule carries specific dispensing, documentation, and storage requirements.


Schedule-by-Schedule Breakdown


| Schedule | Abuse Potential | Accepted Medical Use | Examples |

|----------|----------------|----------------------|---------|

| I | Highest | None in the U.S. | Heroin, LSD, marijuana (federal) |

| II | High | Yes | Oxycodone, fentanyl, methamphetamine, hydrocodone combos (post-2014) |

| III | Moderate | Yes | Anabolic steroids, buprenorphine/naloxone (Suboxone) |

| IV | Lower | Yes | Benzodiazepines (diazepam, alprazolam), zolpidem |

| V | Lowest | Yes | Cough preps with <200 mg codeine/100 mL (Robitussin AC) |


Refill Rules


  • • Schedule II: ❌ No refills allowed. A new written or electronic prescription is required for every dispensing.
  • • Schedules III & IV: ✅ Up to 5 refills within 6 months of the original prescription date.
  • • Schedule V: Varies by state; some may be dispensed OTC in limited quantities.

    • Key DEA Forms


  • • DEA Form 222 (or electronic CSOS): Required to order Schedule II controlled substances from a distributor.
  • • DEA Form 106: Must be filed to report theft or significant loss of controlled substances.

    • Emergency Dispensing – Schedule II


  • • A prescriber may phone in a Schedule II prescription during a documented emergency.
  • • Supply is limited to the emergency period only (typically a 72-hour supply).
  • • The prescriber must follow up with a written/electronic prescription within 7 days.

    • Record Retention


  • • Schedule II records must be retained for a minimum of 2 years under federal law.
  • • ⚠️ Some states require longer retention periods — always check state law.

    • Important Reclassification


  • • In 2014, hydrocodone combination products (e.g., Vicodin) were moved from Schedule III → Schedule II, eliminating the ability to refill these prescriptions.

    • Key Terms

  • • Controlled Substance – A drug regulated by the DEA under the Controlled Substances Act (CSA)
  • • CSOS (Controlled Substance Ordering System) – Electronic equivalent of DEA Form 222
  • • DEA Form 222 – Paper order form for Schedule II substances
  • • DEA Form 106 – Theft/loss reporting form
  • • REMS (Risk Evaluation and Mitigation Strategy) – FDA-required safety program for high-risk drugs; may include restricted distribution, mandatory enrollment, or required medication guides

    • > ### ⚠️ Watch Out For

    > - Confusing Schedule I (no medical use) with Schedule II (medical use but high abuse) — both have high abuse potential, but only Schedule II drugs can be legally dispensed.

    > - Forgetting that Schedule II drugs CANNOT be refilled — this is one of the most tested rules.

    > - Mixing up DEA Form 222 (ordering) with DEA Form 106 (reporting theft/loss).

    > - Assuming federal record retention (2 years) overrides state law — states can require longer periods.


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    Drug Categories by Therapeutic Class


    Naming Conventions ("Stem Suffixes")

    Recognizing drug name stems allows you to quickly identify drug classes. These are heavily tested on the PTCB.


    | Suffix/Stem | Drug Class | Examples |

    |-------------|-----------|---------|

    | -olol | Beta-blockers | Metoprolol, atenolol, carvedilol |

    | -pril | ACE Inhibitors | Lisinopril, enalapril, benazepril |

    | -sartan | ARBs (Angiotensin II Receptor Blockers) | Losartan, valsartan |

    | -statin | Statins (HMG-CoA Reductase Inhibitors) | Atorvastatin, simvastatin |

    | -gliptin | DPP-4 Inhibitors | Sitagliptin (Januvia), saxagliptin |

    | -prazole | Proton Pump Inhibitors (PPIs) | Omeprazole, pantoprazole |

    | -oxacin / -floxacin | Fluoroquinolone Antibiotics | Ciprofloxacin, levofloxacin |


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    Cardiovascular Agents


    #### ACE Inhibitors (-pril)

  • • Mechanism: Block angiotensin-converting enzyme → ↓ Angiotensin II → vasodilation → ↓ BP
  • • Uses: Hypertension, heart failure, diabetic nephropathy
  • • Examples: Lisinopril, enalapril, benazepril

    • #### ARBs (-sartan)

  • • Mechanism: Block angiotensin II receptors → vasodilation → ↓ BP
  • • Uses: Hypertension (especially in ACE inhibitor-intolerant patients)
  • • Examples: Losartan, valsartan

    • #### Beta-Blockers (-olol)

  • • Mechanism: Block beta-adrenergic receptors → ↓ heart rate and blood pressure
  • • Uses: Hypertension, heart failure, arrhythmias, angina
  • • Examples: Metoprolol, atenolol, carvedilol

    • #### Statins (-statin)

  • • Mechanism: Inhibit HMG-CoA reductase → ↓ cholesterol synthesis in the liver
  • • Uses: Hyperlipidemia, cardiovascular risk reduction
  • • Examples: Atorvastatin, simvastatin, rosuvastatin

    • #### Thiazide Diuretics

  • • Mechanism: Increase renal sodium and water excretion → ↓ blood volume → ↓ BP
  • • Uses: Hypertension, edema
  • • Key Side Effect: Hypokalemia (low potassium) — potassium excretion increases
  • • Examples: Hydrochlorothiazide (HCTZ)

    • #### Warfarin (Anticoagulant / Vitamin K Antagonist)

  • • Mechanism: Antagonizes vitamin K → inhibits synthesis of clotting factors II, VII, IX, X
  • • Uses: DVT, pulmonary embolism, atrial fibrillation, stroke prevention
  • • Note: Requires regular INR monitoring; multiple drug and food interactions

    • ---


    Respiratory Agents


    #### Albuterol – Short-Acting Beta-2 Agonist (SABA)

  • • Use: Rescue inhaler for acute asthma attacks and COPD bronchospasm
  • • Mechanism: Stimulates beta-2 receptors → bronchodilation

    • #### Montelukast (Singulair) – Leukotriene Receptor Antagonist

  • • Use: Long-term asthma management; seasonal allergic rhinitis

    • ---


    Gastrointestinal Agents


    #### Proton Pump Inhibitors – PPIs (-prazole)

  • • Mechanism: Block the gastric proton pump (H⁺/K⁺ ATPase) → ↓ acid production
  • • Uses: GERD, peptic ulcers, H. pylori (in combination)
  • • Examples: Omeprazole (Prilosec), pantoprazole (Protonix), lansoprazole

    • ---


    Psychiatric / Neurological Agents


    #### SSRIs (Selective Serotonin Reuptake Inhibitors)

  • • Mechanism: Block serotonin reuptake → ↑ serotonin in synapse
  • • Uses: Depression, anxiety disorders, OCD, PTSD
  • • Examples: Fluoxetine (Prozac), sertraline (Zoloft), escitalopram (Lexapro)

    • #### Tricyclic Antidepressants (TCAs)

  • • Mechanism: Inhibit reuptake of serotonin and norepinephrine
  • • Uses: Depression, neuropathic pain
  • • Examples: Amitriptyline, nortriptyline
  • • ⚠️ Major Safety Concern: Cardiotoxicity in overdose — can cause fatal arrhythmias

    • #### Gabapentin (Neurontin) – Anticonvulsant

  • • Uses: Epilepsy, neuropathic pain, postherpetic neuralgia
  • • Note: Despite the name, gabapentin does not act directly on GABA receptors; it modulates calcium channels.

    • ---


    Anti-Infective Agents


    #### Beta-Lactam Antibiotics

  • • Mechanism: Inhibit bacterial cell wall synthesis
  • • Classes: Penicillins, Cephalosporins, Carbapenems
  • • ⚠️ Key Concern: Penicillin allergy may result in cross-reactivity with other beta-lactams (especially cephalosporins)

    • #### Fluoroquinolones (-floxacin)

  • • Mechanism: Inhibit bacterial DNA gyrase and topoisomerase IV → disrupts DNA replication
  • • Uses: Broad-spectrum bacterial infections (UTIs, respiratory, GI)
  • • Examples: Ciprofloxacin (Cipro), levofloxacin (Levaquin)

    • ---


    Endocrine / Metabolic Agents


    #### Metformin (Glucophage) – Biguanide

  • • Mechanism: ↑ Insulin sensitivity; ↓ hepatic glucose production
  • • Use: First-line treatment for type 2 diabetes

    • #### DPP-4 Inhibitors (-gliptin)

  • • Mechanism: Inhibit DPP-4 enzyme → ↑ incretin levels → ↑ insulin release, ↓ glucagon
  • • Use: Type 2 diabetes
  • • Examples: Sitagliptin (Januvia), saxagliptin (Onglyza)

    • #### Bisphosphonates

  • • Mechanism: Inhibit osteoclast activity → ↓ bone resorption
  • • Use: Osteoporosis treatment and prevention
  • • Examples: Alendronate (Fosamax), risedronate (Actonel)

    • ---


    Immunosuppressants / Disease-Modifying Agents


    #### Methotrexate – Antimetabolite / DMARD

  • • Uses:

    • - Antineoplastic: Cancer treatment

    - DMARD: Rheumatoid arthritis, psoriasis

  • • Mechanism: Inhibits dihydrofolate reductase → ↓ folate synthesis → ↓ rapidly dividing cells

    • ---


    Key Terms

  • • ACE Inhibitor – Blocks angiotensin-converting enzyme; reduces blood pressure
  • • ARB – Angiotensin II Receptor Blocker; alternative to ACE inhibitors
  • • Beta-Blocker – Blocks adrenergic receptors; reduces heart rate and BP
  • • SABA – Short-Acting Beta-2 Agonist (rescue inhaler)
  • • SSRI – Selective Serotonin Reuptake Inhibitor; first-line antidepressant
  • • PPI – Proton Pump Inhibitor; reduces gastric acid
  • • DMARD – Disease-Modifying Antirheumatic Drug
  • • DPP-4 Inhibitor – Antidiabetic class that increases incretin hormones
  • • HMG-CoA Reductase – Enzyme blocked by statins to reduce cholesterol
  • • Hypokalemia – Low potassium; side effect of thiazide diuretics

    • > ### ⚠️ Watch Out For

    > - Carvedilol ends in -olol but is an alpha/beta-blocker — still classified as a beta-blocker.

    > - Gabapentin: The name implies it works on GABA, but it does not — it acts on calcium channels.

    > - Methotrexate has dual roles: it is both a cancer drug AND a DMARD — context matters.

    > - Warfarin monitoring: INR must be monitored regularly; foods high in vitamin K (leafy greens) reduce its effectiveness.

    > - Don't confuse ACE inhibitors (-pril) with ARBs (-sartan) — both lower BP but have different mechanisms and side effect profiles (ACE inhibitors can cause a dry cough; ARBs typically do not).

    > - Thiazide diuretics cause hypokalemia; potassium-sparing diuretics (e.g., spironolactone) cause hyperkalemia — know the difference.


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    FDA Pregnancy Risk Categories


    Legacy Letter System (Still Tested on PTCB)


    | Category | Meaning | Risk Level |

    |----------|---------|-----------|

    | A | Controlled studies show no fetal risk in first trimester | Safest |

    | B | Animal studies show no risk, but no adequate human studies | Low risk |

    | C | Animal studies show adverse effects; no adequate human studies; benefits may outweigh risks | Moderate risk |

    | D | Evidence of human fetal risk exists; benefits may still justify use | High risk |

    | X | Fetal abnormalities confirmed; risks clearly outweigh benefits | Contraindicated in pregnancy |


    Key Example: Warfarin in Pregnancy

  • • Category X — crosses the placenta → causes fetal hemorrhage, warfarin embryopathy, and fetal death
  • • Absolutely contraindicated during pregnancy
  • • Heparin (does not cross placenta) is used as the anticoagulant alternative in pregnancy

    • The New PLLR System (2015)

  • • The Pregnancy and Lactation Labeling Rule (PLLR) replaced the A–X letter categories in 2015 for newly approved drugs.
  • • The PLLR uses three narrative subsections:

    • 1. Pregnancy – risks and clinical considerations

    2. Lactation – use during breastfeeding

    3. Females and Males of Reproductive Potential – fertility and contraception considerations

  • • Provides more detailed, clinically actionable information than the letter system.

    • Key Terms

  • • Teratogen – A substance that causes birth defects
  • • Category X – Contraindicated in pregnancy; risks outweigh benefits
  • • Category A – Safest; well-controlled human studies confirm no fetal risk
  • • PLLR – Pregnancy and Lactation Labeling Rule; replaced letter categories (2015)

    • > ### ⚠️ Watch Out For

    > - The PLLR replaced the A–X system for new drugs approved after 2015 — older drugs may still carry letter categories on exams.

    > - Category D ≠ Category X — Category D drugs may still be used if benefits outweigh risks; Category X drugs are always contraindicated.

    > - Warfarin is Category X — a frequently tested example. Know why (crosses placenta, causes fetal harm).


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    Controlled Substance Handling and Regulations


    Ordering Controlled Substances

  • • Schedule II: Must use DEA Form 222 or electronic CSOS
  • • Schedule III–V: Can be ordered without a DEA form (standard purchase order with record-keeping)

    • Dispensing Requirements Summary


    | Requirement | Schedule II | Schedule III–IV | Schedule V |

    |------------|-------------|-----------------|-----------|

    | Written/Electronic Rx | Required | Required | Required (or OTC in some states) |

    | Oral/Phone-in Rx | Emergency only | Yes | Yes |

    | Refills | ❌ None | ✅ Up to 5 in 6 months | Varies |

    | Record

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