The active ingredient in this rodenticide is bromethalin. Unlike first and second generation rodenticides which function as anti-coagulants, bromethalin is a neurotoxin, making it far more effective and faster. First and second generation rodenticides usually require a rat to eat quite a bit of the poison, then you have to wait another 5 to 7 days for the creature to die. Usually more than a week passes before the creature died. This doesn't sound like much, but a week of damage in your garden or in your house can be rather significant. With Bromethalin, one single lethal dose is all that is required to kill the creature. The rat usually dies around 3 days later. Bromethalin, because it is so effective, is also very toxic to humans and pets, so it is far more likely to affect non-targeted creatures too. You will need to wear gloves as it can be absorbed through the skin. Be careful not to inhale small dust particles, although that is unlikely to happen as it comes in blocks. There is no antidote available for Bromethalin poisoning, should someone ingest it, so be very careful if you have kids or pets in the backyard. Unlikely first and second generation rodenticides that are generally less toxic to groundhogs and opossums, bromethalin will kill them. They are not meant to be used that way and it may even be illegal in some areas to kill these creatures using bromethalin, so try not to leave these lying around in your garden in the open. You might end up with more than just dead rats. The same goes for any pets in the area. It is advisable to only use Bromethalin in suitable devices that have a small hole large enough for mouse or rats. Bromethalin is an effective tool for controlling the population of mice and rats in your garden. I really like this product as it is effective, yet affordable too. I find that I use less of this compared to less effective rodenticides. I prefer the blocks compared to the small rice-like granules packets. The granular packets often contain too much bait every per packet. The blocks are much easier to spread and are a smaller portion too. They fit well in mice traps. Using one or two at a time is enough for a particular spot, so they last a long time. There is one thing to note: These are best suited for outdoor or garden use. The reason is that if you use these indoors, the rats are likely to end up dying behind a wall, in the air vent, or in some unknown corner of the house. The smell is not pleasant and can last for a few weeks. If you are looking to handle mice that are inside the house, I would recommend getting an electric mouse trap. That way, they do not end up rotting behind some furniture or wall. This rodenticides are best reserved for outdoor use.

This is the first product that I have had consistent success keeping out mice infestation. I just put a chunk in an almost empty peanut butter jar and shake it up a bit. The mice come in as always cuz the house is 125 years old but they don't last long. I have tried live traps and other killer baits but this is the only one that was worth the time and money. Some killer baits seem like food to them but not this one. It works as advertised. Worth the 5 star rating.

Have avocado trees with lot of mice and rats being attracted to them as the avocado trees mature. Well nothing else was working so used some fishing string and since these blocks have holes in them just tied them to the main branches about mid-way up the tree and it has been about 3 days there now lots of evidence the blocks are being eaten and well, I don’t hear any more rodents on the trees at night. I also have the 50/50 jiffycorn bread mix and baking soda near the trees but the mice and rats have been walking over that to get onto the avocado trees so needed something additional to get them and well these blocks are the ticket at least for the mice and rats around here. I read other reviews of people’s rats eating them and still living well glad I don’t have that breed of rats here otherwise I would not be giving 5 stars. So if you have fruit trees in socal you want to protect but don’t have any real cats to help you, this tomcat stuff is as good as a real prime cat it seems!

Great for rats and mice but not quirrels

Oh man, I have been waiting to write this bad boy for a minute. So, my wife and I moved into our new home with limited signs of mice evidence. I did notice some droppings around our water heater, but assumed they were old and well taken care of. Fast forward a year and we were being ATTACKED! It went from no mice activity to holes in our dog food bags, crawling in the walls, and eventually them running around in the house. The house was the last straw...I began battle. Naturally I went for the cheapest options first. We did wooden mouse traps with peanut butter. They would get set off and the peanut butter would be gone, but no mouse. Next, giant wooden rat traps. Same story. Then, sticky pads and traps combined. Got two kills with the sticky pad, but the mice still seemed to begetting off of them somehow. I WAS LOSING MY MIND! The freaks were still running around the house and pooping everywhere. My whole garage smelled terrible and it was seeping into the house. I would even flip the light on real quick and peak my head into the garage only to see them sitting on my golf bag staring at me. They didn't even care. I took that personally and decided there were no longer any rules. I bought 24 JAWS mouse traps from amazon. These were not as productive as I would have liked, but I was getting kills. Then it happened, 1 RAT (bc this motherlover was huge) got caught in three traps at the same and was still flailing around in my garage. I grabbed my shovel and took its head. The line had been crossed. I was committed. POISON, it had to be done. I read reviews for hours and everyone seemed to have the same issues I did. So I got the bait and spread it in 3 of the main locations I saw activity. They ate it fast, like within the hour. Every time one disappeared, I replaced. Eventually the bait stopped disappearing. Then came the smells. Mice dying in my vents and walls. From what i've read, that will go away. BUT THEN! And you aren't gonna believe this nonsense... My wife and I are watching TV downstairs and something caught her eye. There was a flipping rat sitting within a couple feet of us staring at our Xmas tree. She flipped, I flipped, our son laughed. It didn't move. I walked up to it. Nothing, it stood cold. The poison must have it messed up in the head, right? I decided to sweep it into a box; didn't have to. I put the box down and walked right in. After staring at it for twenty minutes I realized what had to be done. I took it outside and removed it's head with my shovel. The dded was done. Now we wait.... Listen, this stuff will solve your problem. But when the time comes, you will have to "take matters into your own hands". God's Speed.