Rats are the one of the hardiest creatures on Earth. They can live in the most disgusting places and eat even more disgusting food. All that would only make a rat grow bigger and hardier still. If you flush a rat down the toilet, it can swim in pipes forever, several days if it had to and holding its breath for up to 3 minutes at a time, until it reaches the sewer. A more adventurous rat would climb sewer pipes and end up in someone else’s toilet.
It goes without saying that we would need the strongest poisons to kill these buggers quickly. The problem is the strongest poisons are not available commercially. You know, as bad as rats are, there are always humans who are even more evil and they are certain to come up with other uses for the most lethal poisons (if they are available).
What we’re left with are rat poisons that will take a few days to kill rats. The stricken rats would die far away from where you left the poison and stink up the joint. Rat poisons can also kill pets and other animals. However, they are the cheapest and most effective way of killing a bunch of rats, so we have done the research and found for your information the best rat poisons on the market today. You can just leave the poison out or use as bait in a bait station. A refillable bait station like the Tomcat would protect the rat poison from the environment outdoors and prevent other animals from eating it.
Here are our picks for the best rat poisons along with tips on how to use them.
Old Cobblers Farm
Just One Bite Bar
Farnam’s Just One Bite comes in a 16oz block that can be readily broken into 8 pieces. It’s now in the mk II version with nibble ridges on which rats and mice love to munch.
The active ingredient is bromadiolone. Bromadiolone is a second generation anticoagulant rodenticide. It is a vitamin K antagonist blood thinner. If overdosed, the blood-clotting property of vitamin K in the body is reduced to such an extent that it would cause internal bleeding and death.
The most famous first-generation anticoagulant rodenticide is of course warfarin. Warfarin has been used as rat poison since 1948 and by now many rat populations have developed a resistance for it. Bromadiolone is also known as super-warfarin because rats have not developed a resistance for it and it is a lot more lethal.
Warfarin has to be consumed by a rat for a few days in a row to cause death but only one dose of bromadiolone is enough. The median lethal dose in rats is 1.125mg/kg of body weight. An average brown rat weighs 8oz or 0.2269kg, so just 0.255mg of bromadiolone is enough to kill it. One broken-down piece of Just One Bite II weighs 2oz and contains 0.005% or 2.83mg of bromadiolone.
Therefore, it is indeed true that just one bite is enough for a rat to bite the dust, though it will take 4 to 5 days for the rat to croak from internal bleeding. But the point is this product works and it’s relatively affordable.
Farnam recommends 2-8 pieces per placement separated 15-30ft apart for rats and 1 piece per placement separated 8-12ft apart for mice.
JT Eaton’s 709-PN comes in a tamper-evident pail of 144 one-ounce bait blocks. The active ingredient is 0.005% Diaphacinone (also known as diphenadione).
Like the bromadiolone used in Farnam Just One Bite II, Diaphacinone is a second generation vitamin K antagonist anticoagulant rodenticide. The major difference is its median lethal dose. While the median lethal dose of bromadiolone in rats is constant at 1.125mg/kg body weight for most populations of rats, the median lethal dose of Diaphacinone in different populations of rats can vary from 0.3 to 7mg/kg body weight.
For some rats, JT Eaton 709-PN is more lethal than Farnam Just One Bite II but other rats may have to consume more than one block to die. The good news is you get 144 blocks in one pail of JT Eaton 709-PN and each block is formulated with the flavor of peanut butter that is not only irresistible to rats but can attract them from far away.
These bait blocks work well in basements and garages. We particularly love the fact that this is just about the only rat poison in the world that comes with a one year warranty!
Ready Mix Baitbits
d-CON Ready Mix Baitbits is one of the most popular rat poisons. The active ingredient is 0.005% brodifacoum.
Brodifacoum is also a second generation vitamin K antagonist anticoagulant rodenticide. Although it’s in the same category as the other products above, brodifacoum is the most lethal of them all. The median lethal dose in rats is a miniscule 0.27mg/kg of body weight. This is why it comes in a tray full of small pellets. One little pellet is enough to kill any rats. No rat can resist putting its dirty mouth on a d-CON pellet. Even if it changes its cunning mind quickly, the darn rat is probably toast. It can take up to 5 days for a rat to die but usually, after a day or two, it’ll feel too crappy to menace our property.
The downside is brodifacoum has an exceptionally long half-life in a rat’s body. For this reason, d-CON Ready Mix Baitbits has a high risk of secondary poisoning. Domestic animals, birds and other mammals that ate or played with a poisoned rat’s carcass would be at risk. It’s important to find and properly dispose of dead rats after using this product.
Our best rat poison is d-CON Ready Mix Baitbits. This product is so potent that President Obama’s EPA took Reckitt Benckiser (the manufacturer of d-CON) to court and made them stop manufacturing it. Hurry! Buy some before it is sold out. This stuff is awesome and the company has no plan to resume manufacturing under President Trump’s EPA.
If you care about the environment or harming birds and other animals, go for the JT Eaton 709-T instead. It is nowhere as lethal but the peanut butter flavor can make rats eat a lot of this stuff.
Finally, if you think you only have a few rats to get rid of, save some money and buy the Farnam Just One Bite II.