The label is the law. Rates and restrictions below are taken from the product labels listed under Sources. Your product's own label governs; read it before you mix or apply. Mixing calculator · Disclaimer
- Active ingredient
- Warfarin
- Chemical class
- Hydroxycoumarin anticoagulant: the label lists it as 3-(alpha-acetonylbenzyl)-4-hydroxycoumarin and warns that swallowing it may reduce the blood's clotting ability and cause bleeding.[1]
- Mode of action
- Anticoagulant: reduces the blood's ability to clot, reversed with vitamin K1; rodenticides have no IRAC insecticide group[1]
- Signal word
- Rodex Pelleted Bait with Coated Warfarin: Caution[1]
A bait that needs repeated feeding
Rodex directions call for an uninterrupted supply of fresh bait for at least 10 days for rats and 15 days for house mice. Where rodents keep moving in from outside, the label suggests permanent bait stations refilled as needed.[1]
The product can't be sold in containers holding less than 4 pounds of bait. EPA's 2009 acceptance letter notes the label complies with its 2008 risk mitigation decision for ten rodenticides.[1]
Where it is used
Outdoor above-ground placements must go in bait stations. Use tamper-resistant stations wherever children, pets, non-target mammals or birds could get to the bait.[1]
Place bait where rodents travel: along walls, beside gnawed openings and burrows, in corners and between floors and walls. Shelter it from rain and snow, and remove other food where you can.[1]
Never broadcast the pellets. Keep them off food and feed and away from ventilation duct openings, and stay out of food-handling areas of processing plants.[1]
Replace spoiled or contaminated bait right away. Wearing waterproof gloves, pick up dead rodents and leftover bait, and treat again if rodents come back.[1]
Products and registrations
| Product | Registrant | EPA Reg. No. | Active % | Formulation | Signal word |
|---|---|---|---|---|---|
| Rodex Pelleted Bait with Coated Warfarin[1] | HACCO, Inc. | 61282-37 | 0.025% | pelleted bait in bait packs | Caution |
Label rates
| Product | Use | Pests | Rate |
|---|---|---|---|
| Rodex Pelleted Bait with Coated Warfarin | In and around homes, farm, commercial and public buildings, within 50 feet of them; transport vehicles | Norway rats and roof rats | 1–4 bait packs per placement[1] Space placements 15 to 30 feet apart. Keep fresh bait out without a break for at least 10 days, or until rats stop feeding on it. |
| Rodex Pelleted Bait with Coated Warfarin | In and around buildings, within 50 feet of them | House mice | 0.25–2 oz bait per placement[1] A quarter to half ounce per spot, 8 to 12 feet apart, with up to 2 ounces where mice are very active. Keep it stocked for at least 15 days or until feeding stops. |
Safety and environmental hazards
People
Signal word CAUTION: harmful if swallowed. Handlers wear shoes, socks and gloves, and anyone collecting carcasses or leftover bait wears waterproof gloves. Doctors are told to give vitamin K1 and repeat it based on clotting tests.[1]
Pets
If a pet eats bait, call a veterinarian right away; the vet's treatment is vitamin K1. The label also warns that dogs and cats may be poisoned by eating rodents that ate the bait.[1]
Bees and pollinators
The label has no bee warning. Its environmental hazards are about mammals, birds and other wildlife.[1]
Fish and water
Described as extremely toxic to mammals, birds and other wildlife. Don't apply it to water or where surface water is present, don't leave bait exposed on bare soil, and don't use it where runoff is likely.[1]
Common questions
- How long should warfarin bait stay out?
- Keep fresh Rodex bait available for at least 10 days for rats and 15 days for house mice, or until there are no new signs of feeding.[1]
- Is there an antidote for warfarin poisoning?
- Yes. The label tells doctors and veterinarians to give vitamin K1, by mouth or injection for people, repeated as clotting tests require.[1]
- Can I put warfarin bait out in my yard?
- Only within 50 feet of buildings, and any outdoor above-ground placement must be inside a bait station.[1]
Sources
- U.S. EPA Pesticide Product Label System, “Rodex Pelleted Bait with Coated Warfarin label, EPA Reg. No. 61282-37 (EPA-stamped, Oct. 21, 2009).” www3.epa.gov/pesticides/chem_search/ppls/061282-00037-20091021.pdf (accessed 2026-10-06)