Is Warfarin Hazardous Waste?
Warfarin is on nearly every pharmacy’s shelf — and it’s one of the most-cited hazardous pharmaceutical wastes in the country. Toss it in the regular drug waste and you’ve got a RCRA violation. The short answer: yes, warfarin is hazardous waste — and how you classify it depends on the concentration.
In this guide
P-listed or U-listed? It depends on concentration
Warfarin is a listed RCRA-hazardous waste — and it’s on two lists depending on concentration:
- Greater than 0.3% → P001 (P-listed, acutely hazardous — the strictest tier).
- 0.3% or less → U248 (U-listed, hazardous but non-acute).
Because discarded warfarin almost always falls on one of these two lists, the practical answer for a pharmacy or facility is simple: treat warfarin as RCRA-hazardous, every time.
Why warfarin is acutely hazardous
Warfarin is a potent anticoagulant — and, historically, a rodenticide, which is the property that lands the concentrated form on the EPA’s P-list. Acutely hazardous (P-listed) wastes get the strictest handling because even small quantities carry significant risk, including tighter accumulation limits and container-rinsing rules.
How to dispose of warfarin
Segregate discarded warfarin into a black RCRA-hazardous container — never regular pharmaceutical (blue) or biohazard (red) waste. Ship it under DOT rules with a hazardous-waste manifest, and destroy it at a permitted facility (typically incineration), with documentation. A prepaid RCRA mail-back kit or scheduled pickup handles the container, manifest, and destruction in one step. Facilities manage warfarin under the Subpart P standard, which also banned sewering it.
Other common drugs that are hazardous waste
Warfarin isn’t alone on the shelf. Nicotine (P075), physostigmine, certain epinephrine forms, and many chemotherapy agents are also RCRA-hazardous, plus a long U-list. Cross-check the P- and U-lists and the NIOSH hazardous drug list, and see our full hazardous pharmaceutical waste guide for the complete picture.
Dispose of warfarin and other hazardous drugs compliantly.
Black-container RCRA mail-back and pickup — P/U-listed drugs, manifested and incinerated, documented on every order.
Frequently asked questions
Is warfarin hazardous waste?
Yes. Under the EPA's RCRA rules, warfarin is a listed hazardous waste. At concentrations greater than 0.3% it's P-listed as P001 (acutely hazardous); at 0.3% or less it's U-listed as U248. Either way, discarded warfarin can't go in regular pharmaceutical or trash — it must be managed as RCRA-hazardous waste.
Is warfarin P-listed or U-listed?
Both, depending on concentration. Warfarin above 0.3% is P001 (acutely hazardous, the strictest tier). Warfarin at or below 0.3% is U248. Most warfarin salts and the branded product fall on one of these two lists, so discarded warfarin is virtually always RCRA-hazardous.
How do you dispose of warfarin?
Segregate discarded warfarin into a black RCRA-hazardous container, keep it out of regular pharmaceutical (blue) and biohazard (red) waste, ship it under DOT rules with a hazardous-waste manifest, and destroy it at a permitted facility — typically by incineration — with documentation.
Why is warfarin acutely hazardous?
Warfarin is a potent anticoagulant and, historically, a rodenticide — the property that lands it on the P-list. The EPA treats acutely hazardous (P-listed) wastes with the strictest handling because even small quantities pose significant risk.
What other common drugs are hazardous waste like warfarin?
Nicotine products (P075), physostigmine, epinephrine in certain forms, and many chemotherapy agents are also RCRA-hazardous, along with a long U-list. When in doubt, check the P- and U-lists and the NIOSH hazardous drug list, and segregate anything that appears.