How rat poison works
Most rat baits use anticoagulant rodenticides, which stop blood clotting. They don’t work instantly: rats need to feed on the bait, sometimes over several days, and death follows later. That delay matters because rats can die out of sight, in wall voids, under floors or in lofts, and the smell can last for a week or two.
Why DIY baiting so often fails
- Rats are wary of new objects and may avoid bait for days after it appears.
- Bait is often put in the wrong place, away from their runs, so it isn’t taken.
- Food is still available, so bait isn’t the most attractive option.
- The entry point isn’t sealed, so new rats arrive.
- Products bought by the public are restricted and may be less potent than professional ones.
What the UK rules say
According to the Health and Safety Executive, both professionals and the general public may use rodenticides, but with different restrictions. Products sold to the public are limited by the amount of active substance, where they can be used (for example only within a bait box) and the pack size. Professional users must follow the requirements of a UK rodenticide stewardship regime, which includes training, certification and a code of best practice. See the HSE rodenticides guidance and the stewardship regime explained by Think Wildlife (CRRU UK).
Risks to pets, children and wildlife
- Pets can be poisoned by eating bait or by eating a poisoned rat.
- Children can be harmed by bait left within reach.
- Wildlife, including birds of prey and foxes, can be poisoned by eating rodents that have fed on bait.
If you think a pet or child has eaten rat poison, contact a vet or NHS 111 (or call 999 in an emergency) straight away. Take the packaging with you, because the active ingredient determines the treatment.
If you do use bait yourself
- Follow the label exactly, including where it can be used.
- Use a tamper-resistant bait box and place it along walls where rats run.
- Keep it out of reach of children, pets and wildlife.
- Check regularly, remove dead rats safely (with gloves) and dispose of them as the label says.
- Don’t scatter loose bait.
Alternatives to poison
- Snap traps in covered boxes keep the trap away from pets and children.
- Removing food and shelter makes your property less attractive.
- Proofing stops rats getting in. See rat proofing.
When to call a professional
Call a professional if rats are in the loft or walls, if activity continues after a week or two, if you have children or pets, or if you’re unsure where the rats are getting in. A technician can inspect, position stations where rats actually travel, follow up, and seal entry points. See loft rat removal and garden rat control, or what rat control costs.
Rat poison questions
How long does rat poison take to work?
Rats usually need to feed on anticoagulant bait more than once, so it often takes several days. That’s why follow-up visits matter.
Is rat poison safe for dogs and cats?
No. It is dangerous to pets, and they can also be harmed by eating a poisoned rat. Use secured bait boxes and contact a vet immediately if you think a pet has eaten poison.
Can I buy professional rat poison?
Professional products are restricted to trained users following the UK stewardship regime. Products for the public are limited in strength and where they can be used.
Why won’t the rats eat the bait?
Rats are wary of new objects and may avoid bait for days, or they may have easier food available. Removing other food and positioning bait along their runs helps.
This site connects households and businesses in the Newark-on-Trent area with an independent local rat-control technician. We are not the servicing contractor and do not carry out treatment ourselves. See our terms & disclosure.