How Long Does It Take for a Rat to Die from Poison?

The type of poison, the amount, the size, and the state of health of the rat can all affect how long it takes for a rat to die after consuming poison. The average time it takes for a rat to die after consuming poison ranges from a few hours to several days. For instance, whereas certain toxins have a short half-life and can kill in a matter of hours, others may take several days to work. It’s crucial to remember that using rat poison can potentially harm both humans and other animals and the environment. If you have a rat infestation, you should speak with a pest control expert for safe and efficient treatments. Additionally, think about rat control techniques that are non-toxic and compassionate, such as blocking your home’s entryways, eliminating food supplies, and relocating the rats with live traps.


If you are in a terrible situation dealing with rats in your residence, poisoning them may be your first thought. After all, you most certainly believe that a dead rat is preferable to a live one. If you want to use poison, you should know how long an individual rat takes to die from its exposure to the toxin.

The answer to this issue cannot be reduced to a single word since it depends on poison and several other elements. When using some of them, the rat will be dead in as little as 12 hours, while using others may take up to a week.

It Depends on How the Rat Poison Functions

How the poison causes the rat’s death is the primary determinant of how long it takes for the rodent to succumb to its poisonous effects.

Lung Failure – Between 12 Hours and 2 Days

A few different kinds of rat poisons might induce lung failure, but most specialists believe you should steer clear of all of them except zinc phosphide. When it reaches the rat’s stomach and reacts with the stomach acid, it generates phosphine, an extremely poisonous gas. Within the rat’s body, the cells are destroyed by this gas. In most cases, this results in the lungs being damaged. The average time to death is between 12 and 24 hours. However, this might vary depending on what else the rat consumed recently.

Central Nervous System Failure – Between 14 Hours and 4 Days

Only bromethalin can cause the failure of the central nervous system in rats. Hence it is the only toxin that can kill them. It does this by interfering with the ATP cycle, resulting in the rodent’s inability to produce sufficient energy. It just takes a single deadly dosage to end the rat’s life.

Heart Attack – Between 3 and 4 Days

Cholecalciferol is the only rat poison that operates this way; there are few other options. It is a kind of vitamin D3 that causes a heart attack in rats by elevating their blood calcium levels to dangerously high levels. Rats need one meal to eat the deadly amount, then pass away three to four days later.

Dehydration – Between 3 and 5 Days

Some people do not believe dehydrating rat poisons to be toxic since they have just been around more recently. This is because corn gluten or other comparable materials are used rather than chemicals in the production process. Corn gluten will cause the rat’s stomach to expand while simultaneously preventing the rat from absorbing water. After a few days, the rat succumbs to thirst and dies.

Lung Failure – Between 12 Hours and 2 Days

A few different kinds of rat poisons might induce lung failure, but most specialists believe you should steer clear of all of them except zinc phosphide. When it reaches the rat’s stomach and reacts with the stomach acid, it generates phosphine, an extremely poisonous gas. Within the rat’s body, the cells are destroyed by this gas. In most cases, this results in the lungs being damaged. The average time to death is between 12 and 24 hours. However, this might vary depending on what else the rat consumed recently.

Other Aspects That Play Into How Long It Takes to Get Things Done

There are a few additional aspects that, in addition to the specific chemical components of the poison and how it operates, will play a role in determining how long it will take for the rats to perish from the poison. To achieve the desired outcomes in the shortest time, you will need to remove any potential food sources from the rat’s environment. It will also depend on the rat’s size and how well the poison was placed. Keep in mind that the rat must be able to locate the poison for it to be effective.

The rat usually suffers while it is waiting to die.

If you are interested in employing tactics that are kind to rats, you should avoid using poison. This is because the method they utilise to end the rodents’ lives is excruciatingly agonising and fraught with anguish. However, there are other options, such as using snap traps, which reduce the agony associated with the animal’s death.

Additional Significant Considerations about Poison

You may consider using poison to get rid of your rat problem for a few different reasons, including the fact that it is cruel and that there are some additional reasons for doing so.

Dangerous to Both People and Their Pets

The majority of poisons will also pose a threat to both humans and animals if they are consumed. You run the risk of the poison being consumed by either your young kid or your pet if it is accessible. Your pet risks acquiring secondary poisoning if it consumes a toxin-tainted rat.

Some toxins may be hazardous just by being present in a house; they can have adverse effects if you breathe in their vapours or accidentally come into contact with them.

They Will Not Be Completely Successful

It is also important to remember that no rat poison will be 100 per cent successful. Even if the poison were to be effective every time, the rat would first need to consume it. Regrettably, rats are intelligent enough to identify poison in many different situations. You may be able to conceal it to some degree, but there is no assurance that the rat will consume sufficient quantities of the poison to be killed.

This is particularly problematic when there is an excess of other potential food sources. No matter how enticing you make the poison, there is no assurance that the rat will consume it if it has access to alternative food sources. This is the case even if you make the poison smell suitable.

It would help if you Found the Dead Rats.

Assuming that all goes according to plan and you successfully kill the rats with poison, you will have a second issue on your hands, and that problem is discovering the rats that have already died. When they sense that their time has come to pass, rats often return to their nests or other isolated spots where they previously felt secure. Since of this, you will need to do some detective work to locate the dead rats because they will not be in plain sight. Finding and getting rid of the rats before they start to rot and smell will be a race against the clock since you want to do this before the rats start to smell bad.

Other Options

Consult a professional in rat extermination if you have concerns about using poison to kill rats. They may have alternative, more humane ways accessible to aid you, such as snap traps and electronic traps that kill the rats by shocking them. These methods will likely be available to you.


In addition, you should make an effort to make your house less inviting to rats. If you do not do this, fresh rats will replace the ones you kill, leaving you with an ongoing issue.

Also Checkout: How to Make Homemade Rat Poison

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