Pharmaceutical waste: P-listed drugs, the sewer ban and safe disposal
PTCB topic: Storage, handling and disposal of hazardous and non-hazardous substances
- Never pour or flush hazardous waste pharmaceuticals down a drain.
- Label containers "Hazardous Waste Pharmaceuticals"; keep them on site up to one year.
- Warfarin above 0.3% (P001) and nicotine (P075) are P-listed.
- OTC nicotine patches, gums and lozenges are excluded from P075.
- For patients, FDA prefers take-back first, then the flush list, then trash.
Key facts
- Under 40 CFR 266.505, every healthcare facility, very small quantity generators included, is banned from sewering hazardous waste pharmaceuticals.
- Containers of non-creditable hazardous waste pharmaceuticals must be labeled "Hazardous Waste Pharmaceuticals" and may be accumulated on site for up to one year.
- Warfarin and its salts above 0.3% are P001 (acute hazardous waste); at 0.3% or less they are U248.
Show all 7 key factsShow fewer
- Nicotine is P075, but FDA-approved OTC nicotine patches, gums and lozenges are excluded from that listing.
- A stock bottle, vial or unit-dose package emptied by normal practice is considered empty, even if it held a P-listed drug.
- Potentially creditable means prescription, original manufacturer packaging, undispensed, and unexpired or less than one year past expiration.
- FDA's order for patients: take-back first; flush only drugs on the flush list; otherwise mix with an unappealing substance and put it in the trash.
Quick check1 question · 2 more at the end
Under EPA's rules for hazardous waste pharmaceuticals (40 CFR part 266, subpart P), what must a pharmacy mark on each container that holds non-creditable hazardous waste pharmaceuticals?
Correct answer: B.
Subpart P requires every container of non-creditable hazardous waste pharmaceuticals at a healthcare facility (pharmacies included) to be labeled "Hazardous Waste Pharmaceuticals." The containers must also be structurally sound, kept closed and secured against unauthorized access. Non-creditable means the drug has no reasonable expectation of manufacturer credit (for example, residues, contaminated PPE or spill clean-up).
A Biohazard labeling belongs to infectious medical waste, not to the hazardous waste pharmaceutical containers that subpart P covers.
B Correct: 40 CFR 266.502(e) requires each container of non-creditable hazardous waste pharmaceuticals to be labeled or clearly marked with this exact phrase.
C Controlled substance destruction follows DEA rules; this phrase is not the EPA label required for hazardous waste pharmaceutical containers.
D Non-creditable waste has no reasonable expectation of manufacturer credit, so it is not return-to-supplier stock and this is not the required label.
Full lesson
Each part starts with its main idea. Open a part when you want the details.
The short answer: Pharmacies manage hazardous waste pharmaceuticals under EPA's 40 CFR 266 Subpart P. They may never pour or flush them down a drain, must label containers "Hazardous Waste Pharmaceuticals" and may hold them on site up to one year. Warfarin above 0.3% and nicotine are P-listed acute hazardous wastes. For patients, FDA prefers take-back first.
1 Which federal rule covers drug waste in a pharmacy?EPA's Subpart P (40 CFR part 266) is the federal rulebook for hazardous drug waste at pharmacies. 1 min
EPA's Subpart P (40 CFR part 266) is the federal rulebook for hazardous drug waste at pharmacies. It covers "healthcare facilities," a term that expressly includes pharmacies (mail-order and long-term care pharmacies too) as well as hospitals and clinics. Very small quantity generators are exempt from most of it but must still obey the sewer ban and the empty-container rule.
The 2026 PTCE outline lists storage, handling and disposal of hazardous, non-hazardous and pharmaceutical waste as one knowledge area.
A hazardous waste pharmaceutical is a discarded drug that EPA lists (P or U list) or that shows a hazardous characteristic. Two groups matter:
| Group | Meaning | Where it goes |
|---|---|---|
| Potentially creditable | Prescription drug, original manufacturer packaging, undispensed, unexpired or less than 1 year past expiration | Reverse distributor for manufacturer credit |
| Non-creditable | No expectation of credit: free samples, residues, contaminated PPE, spill clean-up | Labeled hazardous waste container |
2 What are the core Subpart P rules?Never sewer it, label it, and ship it out within a year. 1 min
Never sewer it, label it, and ship it out within a year. The rules a technician meets every day:
- Sewer ban. No healthcare facility may discharge a hazardous waste pharmaceutical to a drain or toilet. The ban names very small quantity generators (VSQGs) too.
- Label. Each container of non-creditable waste is marked "Hazardous Waste Pharmaceuticals."
- Container. Structurally sound, compatible, kept closed and secured against unauthorized access.
- Time limit. Up to one year on site, with a way to show the start date (a date on the container or an inventory system).
3 What does "P-listed" mean, and which drugs are on it?Subpart P also has a simple empty-container rule. 1 min
P-listed drugs are acute hazardous wastes, the most tightly controlled group in 40 CFR 261.33. Know the two classic pharmacy examples:
- Warfarin above 0.3% is P001. At 0.3% or less it is U248, a non-acute listing.
- Nicotine is P075, but FDA-approved OTC nicotine patches, gums and lozenges are excluded.
Subpart P also has a simple empty-container rule. This rule covers a stock bottle, dispensing bottle, vial or ampule (up to 1 liter or 10,000 pills) and a unit-dose package. Each one is empty once the drug is removed in the usual way. Its residue is then not hazardous waste.
A syringe is empty only when the plunger was fully pushed; a partly full syringe goes into the hazardous waste pharmaceutical container. Leftover drug in inhalers and tubes of cream is generally managed as non-creditable waste.
4 How should patients get rid of unused medicines?FDA ranks take-back first, the flush list second, and household trash last. 1 min
FDA ranks take-back first, the flush list second, and household trash last. Pharmacies that register with DEA as collectors may offer drop-off kiosks or mail-back envelopes.
| Situation | FDA advice |
|---|---|
| Take-back site or mail-back envelope available | Use it |
| No take-back, drug on the flush list (for example fentanyl, oxycodone, morphine, buprenorphine products) | Flush it |
| No take-back, not on the flush list | Mix uncrushed with dirt, cat litter or used coffee grounds, seal in a bag, put in trash; scratch out label information |
5 What about hazardous drugs that harm workers?The NIOSH List of Hazardous Drugs in Healthcare Settings (2024) flags drugs that can harm the staff who handle them. 1 min
The NIOSH List of Hazardous Drugs in Healthcare Settings (2024) flags drugs that can harm the staff who handle them. It is informational, not a regulation. Table 1 holds drugs with manufacturer's special handling information or known or probable human carcinogen status (valganciclovir is one example). Table 2 holds the other hazardous drugs and marks those that are only reproductive or developmental hazards. The tables are not a ranking.
6 What the technician does 1 min
- Puts hazardous drug waste in the correct labeled container, never down a sink.
- Separates potentially creditable stock (for the reverse distributor) from non-creditable waste.
- Checks the NIOSH list and the package insert before handling an unfamiliar drug.
- Gives patients the pharmacy's take-back options and refers disposal questions to the pharmacist.
Common mistakes
The traps students fall into most. Read these before you practice.
Watch out: Very small quantity generators are covered by the sewer ban, not exempt from it.
Watch out: OTC nicotine replacement patches, gums and lozenges are excluded from P075, not P-listed.
Watch out: Free samples and residues are non-creditable, not potentially creditable.
Watch out: Controlled substances are not automatically on FDA's flush list; only listed drugs (such as fentanyl or oxycodone products) are.
Watch out: NIOSH Table 1 means special handling information or carcinogen status, not "more dangerous than Table 2".
How to remember it
Remember the phrase "No drain, name it, one year." It covers the sewer ban, the required label and the accumulation limit. For the P list, picture the two pharmacy classics: warfarin above 0.3% and nicotine that is not an OTC replacement product.
Self-check:
- Can a VSQG pharmacy pour hazardous waste pharmaceuticals down the drain?
- Which nicotine products are excluded from P075?
- Name the three FDA disposal options in order of preference.