How Long Does Rat Poison Take to Work: (Effective Rodent Killers)

Sharing is caring!

Last Updated on February 3, 2023 by Griselda M.

One of the most common questions asked by homeowners and gardeners is how long does rat poison take to work?

Several factors contribute to the effectiveness of rat poison. Rat poisons work through several different mechanisms. They depend on the ingredients used in the formulation. How fast the poison works is determined by the type of poison and how long it took the rat to accept the bait.

Under the right conditions, the poison starts killing rats within a day. To destroy all the population, give it a week or so.

How Long Does It Take for Tomcat Rat Poison to Work?

If you’re wondering how long it takes for Tomcat poison to work, then we have the answers for you. Tomcat rat poison is a lethal product that kills rodents when they ingest it. Thereafter, the dying stage occurs 24 to 48 hours after ingestion. Keep in mind that this product is quite effective, as all it takes is a small dose of Tomcat bait to clot the rodents’ blood. Thereafter, they lose their ability to move, which is the start of the dying process.

This is because rat poison also causes internal bleeding when rodents nibble on it. The poison also makes these creatures quite susceptible to death caused by slight injury, as the severity of minor cuts and bruises are enhanced once it is in their bloodstream. However, in most cases, it would take around ten days after consuming rodenticides for them to completely perish. Making use of Tomcat rat poison is effective in riding off rodents. For this reason, it is always good to know how long rat poison takes to work.

Rat Poison Blocks How Long to Take Effect

Rat poison blocks how long to take effect is what we are often asked by fed-up homeowners. When it comes to rat poison, the rodenticide bromadiolone is used to kill mice and other rodents. This is because bromadiolone is an anticoagulant that prevents the blood from clotting in the case of profuse bleeding. Green block rat poison contains this substance which works much faster compared to other poisons that are meant for these creatures.

This is because this product is lethal, and a single feed could mean the end of the rat’s life when green block rat poison is ingested. Knowing how long rat poison takes to work, especially if these rodents have become a bother, would be advantageous.

In most cases, it takes more than a week after eating rat poison until they die. Seeing that poison in the form of waxy blocks is less palatable to mice and other rodents, rat bait in the form of pellets attracts them much more quickly. You also would not have to worry about warfarin-resistant rodents when using green block rat poison as it is a tried and tested rat killer that is effective.

How Long Does It Take for Rat Poison Pellets to Work?

Are you wondering how long does it take for rat poison pellets to work? Rat poison pellets are effective, as seen in the behavior and sluggishness of rodents once they ingest them. This is because these rodents will be in an ardent search of water after eating rat poison. After all, it accelerates their state of dehydration. Their weakness progresses over the next couple of days which eventually renders them incapable of moving.

Rat poison pellets are potent and get to work almost immediately after they have been eaten by rodents. Thereafter, you can expect the rats to turn up dead in two or three days after eating the poisoned pellets. Additionally, the consumption of pellets that contain poison also depletes the rat’s appetite so it stops feeding. This is when the risk of secondary poisoning is substantially reduced. For this reason, you have to know how long rat poison takes to work.

However, for the poison to attract rodents and work quickly and effectively, you should consider a few factors. These include the placement of the poisoned pellets and the type of product that you are using. When looking at types of rat poison, you can opt for a first-generation rodent poison which takes about seven days to destroy these creatures. Alternatively, second-generation poison has a much faster efficacy rate and works within two or three days. This is because it causes severe internal bleeding from the time it is ingested.

How Long Does It Take for Rat Poison to Work on Mice?

So, how long does it take for rat poison to work on mice? Depending on the poison you’re using, it could take anywhere from three to ten days to kill mice after they have eaten it. However, this would also heavily rely on where and how you place the poison to attract the mice to the baiting points. Additionally, these areas should be free of moisture and inaccessible to pets, children, and others for effectiveness and safety purposes.

Although it can take more than a week for rodents to perish after consuming poison, the dying process starts within a day after they nibble on the lethal dose of the poisonous bait. Mice that are intoxicated with anticoagulant rodenticides become lethargic as the poison takes effect. This makes these rodents easy targets to predators like hawks, owls, coyotes, and bobcats that are native to an area. Now that you know how long rat poison takes to work, let’s have a look at the types of rat poison available in the market today.

Types of Rat Poison

Rat poison comes in a variety of formulations with small sachets being the most available ones. Rats prefer baits that are palatable – more like they love good things too. The sweeter the bait the longer the rats will feed and the faster they will react.

The three key ingredients used in the rat poison are, bromadiolone, brodifacoum, or difenacoum. These three poisons affect the rats’ blood clotting response resulting in the death of the rodent a few hours or days after ingestion.

Types of Rat Poison

The types of rat poison include:

  • Bait blocks
  • Pasta Bait
  • Rodine rat and mouse killer bait
  • Rat killer bait

Find The Best Rat Poison That Won’t Harm Other Animals

How Long Does It Take for Rat Poison to Work?

After a rat ingests the poison it can take 2-3 days for it to die. Immediately a rat ingests poison, it stops feeding which reduces the risk of secondary poisoning. The effectiveness of the poison depends on some factors include

  • Placing the poison in the correct places
  • Replacing spoiled poison right away
  • Removing all other food and water sources
  • Understanding the size of the rat
  • Increasing the effectiveness of rat poison

As we have seen, the effectiveness of the poison is what determines the time it takes for the rodents to die. Now that you know the different types of rat poison, it’s crucial to learn how to make the poison work faster and give better results.

kd-Con Corner Fit Mouse Poison Bait Station, 18 Count

81GC3WKMvUL. AC SL1500

Here are several ways to do so:

  • Place baits roughly 30 feet apart and for heavier infestations 15 feet apart
  • Place the bait in the most affected areas
  • Inspect the bait frequently
  • Do not move the bait stations – rats respond positively to familiarity
  • Replenish more bait where it’s eaten as soon as possible
  • Continue baiting until all feeding activity stops
  • In wet conditions, use all-weather blocks
  • Use natural and familiar materials in the bait stations to encourage the rodents

Read more about How to Get Rid of Voles

Factors Affecting Rat Poison Effectiveness

Is it a 1st or 2nd generation rat poison? When buying rat poison, you will likely come across 2 categories. The first generation kills rats slowly and they will need to feed on the poison multiple times. The second-generation poisons act fast and the rodent only needs to feed once for it to take effect. If you don’t remove dead rodents from the area fast, the other rodents can develop shyness of the bait. They start to associate the dead ones with the bait.

Rats may develop resistance to these poisons. Some of the 1st generation poisons have been used for a long time.  Over time, some rodent species have developed resistance to the effects of such poisons making them prone.

If the rodent has other sources of food. If there are other available food sources for the rodent, they will likely avoid the bait station. Rats are habitual feeders that are likely to avoid new feeding points if they can still access their accustomed feeding points. Before placing rat poison, clear out all other food sources. Be sure to get the poison to smell similar to the food they eat.

Placing the bait correctly. When placing the bait, set it correctly and securely. Keep your placement away from pets, babies, and bad weather conditions. Use a bait station or snap trap to know the effectiveness of the poison.


Now that you have a clear idea of how long it takes for rat poison to work, go ahead and use the poison with wisdom. If you still wonder if you should use first or second-generation ask yourself these questions:

  • Are your pets at risk of secondary poisoning?
  • Where are your rodents located?
  • How fast do you want them eliminated?
  • Are you going to remove their carcass after they die?
  • Do you have wildlife around your home that might ingest poison after eating the dead rodents and die too?

Whatever type you choose, remember to keep your children, pets, and environment safe from secondary poisoning.


How long does it take a rat to die after eating poison bait?

The answer to this question is that it depends on the type of bait and the type of rat. The size and shape of a rat’s head, as well as their stomach, can affect how quickly poison is digested. Rats with larger heads and thinner stomachs digest food quicker than those with smaller heads and thicker bellies.

There are a lot of factors that can lead to a rat dying more quickly after eating poison bait. For example, if the rat has eaten only a small amount or if they have eaten other foods before they have eaten the poison, then they might die sooner than usual.

Rat poison is typically formulated with one or more anticoagulants, which interfere with blood clotting. This prevents blood from coagulating in wounds and causing death by blood loss. There are two types of rat poisons: first-generation anticoagulant poisons, such as chlorophacinone or diphacinone; second-generation anticoagulant poisons, such as brodifacoum or bromadiolone.

What poison kills rats instantly?

There are three popular methods of using poisons: bait, snap and place and station.

Offering poisoned food is a bait method where the rat eats the bait and becomes instantly dead due to internal bleeding. The snap method is when the rat dies instantly with one dose of poison, while with station method, multiple doses of poison need to be applied throughout the house for best results.

The most common rat poison is warfarin. It's a slow-acting anticoagulant that causes rats to bleed to death internally.

Rodenticides are substances that are toxic to rodents, especially rats. They are used in the control of rat populations.Poison is a substance that kills or injures animals, especially by chemical action. Rats can be killed with any of these poisons: bromethalin, chlorophacinone, aluminum phosphide, and many others. Warfarin is the most popular rat poison because it’s slow acting and doesn't kill the rat immediately like some other poisons do.

Is rat poison painful?

There are many kinds of rat poison. There are also many kinds of ways to take rat poison. Rat poisons can be taken in a variety of forms, such as by putting it in food, water, or bait scents.Rat poison is not painful. It is a chemical that causes death.

The truth is that rat poison does not always cause pain because it depends on the type of poison. If you want to be sure about what kind of poison you are using, it's best to consult with a pest control specialist or do some research online.

In most cases, rat poison does not cause any pain for the animal. In fact, the animal dies from suffocation or asphyxiation because their internal organs stop working properly.

While humans are used to pain for most of their lives, rat poison is not that painful. Rats can drink water with rat poison in it without showing any signs of poisoning.


Sharing is caring!