5.8 OTC, Behind-the-Counter & Hazardous Drugs
Key Takeaways
- The Durham-Humphrey Amendment of 1951 (FDCA § 503(b)) created the modern two-tier system: legend (Rx) drugs and OTC drugs generally recognized as safe and effective (GRAS/GRASE).
- The Combat Methamphetamine Epidemic Act of 2005 places pseudoephedrine and ephedrine behind the counter with a 3.6 g/day and 9 g/30-day limit per purchaser, photo ID, and a logbook.
- PA does NOT require a prescription for pseudoephedrine; the federal CMEA is the controlling floor.
- NIOSH hazardous drugs include antineoplastics, certain hormones, and select antivirals; USP <800> (effective Nov 2023) sets enforceable handling standards including C-PEC, C-SEC, PPE, and dedicated storage.
- PA incorporates USP <800> via 49 Pa. Code §§ 27.601–27.606 (compounding rules); handling includes dispensing and counting, not just compounding.
Three Tiers of Drug Availability
The MPJE tests the federal scheme dividing drugs by access tier — prescription (legend), over-the-counter (OTC), and behind-the-counter (BTC) — plus PA's specific rules on pseudoephedrine and the federal scheme for NIOSH hazardous drugs. Misclassifying a product is a common error.
OTC vs Legend — The Durham-Humphrey Line
The Durham-Humphrey Amendment of 1951 (FDCA § 503(b)) created the modern two-tier system:
| Tier | Standard | Example |
|---|---|---|
| Legend (Rx) | "Caution: Federal law prohibits dispensing without a prescription"; unsafe for self-use | Amoxicillin, atorvastatin, insulin glargine |
| OTC | "Generally recognized as safe and effective" (GRAS/GRASE); adequate labeling for self-use | Acetaminophen, ibuprofen, antacids |
| BTC | OTC status but restricted sale at pharmacy counter | Pseudoephedrine, emergency contraception in some states |
A "legend drug" is one labeled with the federal Rx legend. The FDCA's prescription requirement is not waivable by a state; PA incorporates it via the Controlled Substance, Drug, Device and Cosmetic Act (35 P.S. § 780-101 et seq.).
Behind-the-Counter — Pseudoephedrine and the Combat Methamphetamine Epidemic Act
The Combat Methamphetamine Epidemic Act of 2005 (CMEA), incorporated at FDCA § 505(e) and 21 CFR § 1314, places all pseudoephedrine (PSE) and ephedrine products in a behind-the-counter tier:
- Daily limit: 3.6 grams of PSE base per purchaser per day.
- Monthly limit: 9 grams per purchaser per 30-day period.
- Point of sale: Sold only at retail pharmacies or by licensed retailers; must be stored behind the counter or in a locked case; the customer may not self-select from open shelves.
- Logbook: The seller must record the purchaser's name, address, date, time, and product/quantity in a bound or electronic log; the purchaser must present a photo ID.
- Electronic verification: States operating NPLEx (National Precursor Log Exchange) run real-time stop-sale alerts when the monthly limit is approached.
PA has not adopted a stricter state PSE law — the federal CMEA is the floor and the controlling standard. PA does not require a prescription for PSE (unlike Oregon and Mississippi); PA's pharmacy community has supported real-time electronic stop-sale via NPLEx. On the MPJE, the answer reflecting CMEA limits (3.6 g/day, 9 g/30-day, logbook, photo ID) is correct for PA.
Emergency Contraception
Plan B One-Step and its generics are FDA-approved for OTC sale without age restriction. PA does not restrict OTC access; pharmacies may sell to any purchaser. Some states require a prescription for those under 17; PA does not.
NIOSH Hazardous Drugs and USP <800>
The National Institute for Occupational Safety and Health (NIOSH) maintains the List of Antineoplastic and Other Hazardous Drugs in Healthcare Settings. A hazardous drug is one that can cause cancer, reproductive toxicity, organ toxicity at low doses, or genotoxicity. Common examples: chemotherapy agents (e.g., cyclophosphamide, methotrexate), certain hormones, antivirals (e.g., ribavirin).
USP General Chapter <800> (current revision effective Nov 2023) sets enforceable standards for handling hazardous drugs:
| Requirement | Standard |
|---|---|
| Containment Primary Engineering Control (C-PEC) | Required for compounding hazardous sterile and nonsterile products |
| Containment Secondary Engineering Control (C-SEC) | Negative-pressure room with required air exchanges |
| Personal protective equipment (PPE) | Double chemo gloves, chemo gown, eye/face protection, respiratory protection as needed |
| Receiving | Wear PPE when receiving damaged or leaking hazardous drug packages |
| Storage | Separate negative-pressure storage area; hazard-labeled |
| Dispensing | Wear PPE when counting, packaging, or labeling; avoid crushing; use a counting tray dedicated to hazardous drugs or a disposable tray |
| Waste | Dispose in trace-containment bins; follow EPA and DEA as applicable |
PA incorporates USP <800> via 49 Pa. Code §§ 27.601–27.606 (compounding rules). A PA pharmacy handling hazardous drugs without USP <800> controls is noncompliant.
OTC Products With Restricted Dispensing
Some OTCs are restricted in dispensing by state or federal rule:
- Pseudoephedrine (CMEA, above).
- Emergency contraception (Plan B) — OTC, age unrestricted.
- Naloxone — under PA Act 139 of 2014 (David's Law), pharmacists may dispense both prescription and OTC naloxone under the standing order issued by the PA Secretary of Health/Physician General (see § 5.3).
Common MPJE Traps
- Treating PSE as Rx-only in PA — it is BTC, not Rx.
- Failing to log a PSE sale in the pharmacy's electronic or paper log.
- Stocking PSE on open shelves — a CMEA violation.
- Dispensing hazardous drugs without USP <800> controls — even counting tablets counts as "handling."
- Assuming PA requires a prescription for emergency contraception — it does not.
- Confusing NPLEx with the PDMP — NPLEx tracks PSE; ABC-MAP tracks controlled substances.
Under the Combat Methamphetamine Epidemic Act, what is the maximum amount of pseudoephedrine base a single purchaser may buy per day in PA?
Which handling practice for a NIOSH hazardous drug is required under USP <800> as incorporated by PA compounding rules?
Which statement about emergency contraception (Plan B One-Step) in PA is correct?