Contrac Blox Rodenticide

$81.63 - $97.40

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4.5 out of 5 stars Rating: 4.7

174 Reviews | 73 Q&A


{ $97.40 { $91.87 $81.63 $78.80 $76.85
  Size/Description Price/Ea. Qty
Contrac Blox Rodenticide box (4 x 4 lb. pails)

Buy 1: $97.40 each

Buy 2 or more: $91.87 each

Contrac Blox Rodenticide - 18 lb. Pail 18 lb. bucket

Buy 1: $81.63 each

Buy 2 or more: $78.80 each

Buy 4 or more: $76.85 each

Total Price: $0.00

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For large order quotes, please call us at 1-866-581-7378.

Contrac Blox Rodenticide

Contrac All-weather Blox Rodenticide is a multi-edged, single feeding Rat and Mouse bait. It is formulated with an optimal blend of food grade ingredients and low wax to yield a highly palatable, weatherable bait that is very attractive to rodents. Secondary poisoning is very minimal with Contrac as an antidote to the poison (vitamin K1) is readily available. We recommend placing the blox in tamper resistant mouse bait stations or rat bait stations to protect the bait from non-target animals such as dogs and cats.

Active Ingredient: Bromadiolone .005%

DESCRIPTION: Contrac® All-weather Blox® Rodenticide is a multi-edged, single feeding Rat and Mouse bait. It is formulated with an optimal blend of food grade ingredients and low wax to yield a highly palatable, weatherable bait that is very attractive to rodents. Contrac® All-weather Blox® contains Bromadiolone, which is less toxic to non-target animals in primary and secondary poisoning.

USE: Baits are small 1 oz. size and can be placed in bait stations, in holes and burrows, or where mice and rats tend to travel. A hole in the center of each block allows it to be placed on bait securing rods in tamper resistant mouse bait stations or rat bait stations, or nail or wire it in place.


Ready-to-use CONTRAC BLOX bait pieces feature a patented multi-edge design that gives rodents plenty of gnawing edges per piece. The 1-oz. bait pieces fit easily into burrows, bait stations and tight baiting places. A hole through the center lets you wire/hang the bait, or place on bait securing rods for added security.

It is colored blue and authorized by USDA for use in federally inspected meat and poultry plants.

Do not place bait in areas where there is a possibility of contaminating food or surfaces that come in direct contact with food. Do not broadcast bait.

SELECTION OF TREATMENT AREAS: Determine areas where rats or mice will most likely find and consume the bait. Generally, these areas are along walls, by gnawed openings, in or beside burrows, in corners and concealed places, between floors and walls, or in locations where rodents or their signs have been seen. Remove as much alternative food as possible.

Norway rats and house mice may consume a lethal dose in one feeding with first dead rodents appearing four to five days after treatment begins.


APPLICATION DIRECTIONS: Each bait block in this container weighs approximately one ounce.
RATS: Place 3 to 16 CONTRAC BLOX (usually at intervals of 15 to 30 feet) per placement. Maintain an uninterrupted supply of fresh bait for at least 10 days or until signs of rat activity cease.
MICE: Place 1 block per placement. Space placements at 8- to 12- foot intervals. Two CONTRAC BLOX may be needed at points of very high mouse activity. Maintain an uninterrupted supply of fresh bait for at least 15 days or until signs of mouse activity cease.
RATS AND MICE: Replace contaminated or spoiled bait immediately. Collect and dispose of all dead animals and leftover bait properly. To prevent reinfestation, limit sources of rodent food, water, and harborage as much as possible. If reinfestation does occur, repeat treatment. Where a continuous source of infestation is present, establish permanent bait stations and replenish as needed.

Rating Snapshot

5 stars   141
4 stars   23
3 stars   4
2 stars   3
1 star   3

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Most Helpful Customer Reviews
  • 77 of 84 people found this review helpful:

    5 of 5 stars  Mice like it. But...
    By Robert in Upper Darby PA 19082 on 02/24/2009

    I live in a row-house and have an on and off again love-hate relationship with mice. They love me. I hate them. I put these Contrac Blox in my detached garage and almost every morning they are nibbled at (there is a field behind the garages). They eat it but is it true that if the bait goes stale you have to throw it out? Does it become ineffective? How long? Is there an expiration date on the pail? I would hate to buy the 18 lb size and then have to throw most of it out. Help?

    Expert Response   Expert response:
    The fact that the bait is being eaten every day is a good sign. Mice will not die immediately after eating rodenticide baits, and will probably die somewhere out in the field on their way back to the burrow. Contrac lasts about 2 years in the bucket. When placing the bait, the manufacturer recommends that the bait be changed out every 40-60 days.

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  • 62 of 63 people found this review helpful:

    5 of 5 stars  This stuff is the best!
    By Denis in Washington, DC on 05/12/2010
    Verified Purchase

    Living in a restaurant filled neighborhood in DC with unkempt neighbors on both sides of our house led to our backyard becoming a rat highway. It got so bad that we would have 6 or 7 running across every 5 mins. all night - and they were getting closer and closer to the house. We looked at all kinds of new fencing options only to realize it wouldn't have made a difference since they'd probably just burrow underneath it. We bought this and in less than 1 week's time, we have abolished every rat! We only had one meet his maker in the yard that we had to dispose of, the other hundred or so wandered off to die. It's been close a month now and we still have not seen one. This stuff is BAD A@!.

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  • 40 of 41 people found this review helpful:

    5 of 5 stars  Mice are gone!
    By Tom on 08/23/2005

    We were getting rundown with field mice from the lot next to our home. Traps were not getting the job done. After 2 weeks using Contrac Blox Rodenticide the mice were gone....Thanx

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  • 38 of 38 people found this review helpful:

    5 of 5 stars  The "TRUTH"
    By Tarik on 03/13/2010
    Verified Purchase

    This stuff is the truth. I've tried the Rex traps and other traps but those other methods just didn't get the job done. I live in a duplex with joining garages and my neighbor had dog food which attracted the rats. They were multiplying faster than I could trap them. I bought Contrac and placed them in stacks of three around my garage also stacked six of them where the garages joined. The next day the six were gone. I replaced the six with six more, they disappeared. Within five days not a sign of rats or droppings. I didn't even have to dispose of the dead rats. This is a winner!!!!!!!!!!!!!!

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  • 30 of 32 people found this review helpful:

    5 of 5 stars  Best I have seen
    By Harold on 11/09/2006

    This is the best I have seen. I had a bucket of Contrac Blox rodenticide sitting in the barn and the rats ate a hole in the top of the bucket.

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Most Recent Customer Reviews
  • 5 of 5 stars  This stuff works
    By John in Vallejo, ca on 08/02/2017

    I have been using it for about three years and it does the job. Get the traps and check them about every 60 -90 days (depending on how many you have). I have 3 under my house. We live next to a green belt area and have a constant problem with them I was paying about $89.00 a month for a pest guy so this paid for itself in less than 2 months! However I see this can no longer be shipped to CA so when my supply runs out I will need to get something else

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  • 4 of 5 stars  Works so Far
    By Gerard in slidell la. on 07/21/2017

    I needed something stronger than the D-con stuff they sell. So far it seems to be working much better than anything else I've used in my barn.

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  • 5 of 5 stars  Pest Control
    By Gregg in NY on 07/16/2017

    this item was recommended by an exterminator, stating that while the item itself is expense. the product works great.So far so good, the service from (DoMYOwn) it must say has been excellent as well!

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  • 4 of 5 stars  works
    By Justin in Trinidad, Colorado on 06/20/2017

    I have just received my second bucket. As the first order I received the order with in a week. This bait works well on field mice. I have a remote cabin and was having a major problem. After using this bait in four traps I have I reduced my problem down to two mice in the last year.

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  • 2 of 5 stars  Rats love it but can they become immune to the blox ?
    By Wes in Kirkland, Washington on 06/03/2017

    Went thru 1 x 18 pound tub in 1 year. No sign of a dead rat? Been putting 3 blox per box every 3 weeks I have 5 traps boxes. I am on my 2nd 18 lb tub and its down to 3/4 now. There are rat droppings in the traps like they are eating it for breakfast, lunch and dinner. Can you please help me?

    Expert Response   Expert response:
    We apologize you are not seeing the expected results. The issue is most likely that not enough rodenticide is being used at each baiting station and the rat population is likely much higher than anticipated. We recommend making sure you fill each box and check it once a week and refill as needed. It is unlikely that the rats are resistant to the bait but they may not be getting enough at each feeding to kill them. It is also not unusual to not see dead rats. Rats are known to seek shelter when they feel unwell which often leads to them not being seen when they succumb to the effects of the bait.

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  • 5 of 5 stars  Contrac Rodenticide 18lb Pail
    By J-r in Union City, NJ on 05/29/2017

    We bought this before for ourselves it really works so we bought one for our sister living in Fla she could not believe how great it got rid of the rats

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  • 5 of 5 stars  Contrac Blox Rodenticide
    By Bob in Sparks, Nv. on 05/29/2017

    Works good.

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  • 5 of 5 stars  Get this and save yourself a year of frustration.
    By Kj in Cleveland, OH on 05/22/2017

    So we live in a large city and have never had a problem with small rodents in the last 20 years (raccoons yes, rats no). Then last year I found evidence that we had somehow acquired at least one. There was a building on the corner of the street that had sat abandoned for a bit while it changed ownership. Right after they began renovations is when we found droppings. We tried everything. All those youtube video how-to's and every article I could google, half the products from our local hardware store and things my country relatives suggested. We had some success overall, but we never really got the whole nest. It was driving me up a wall. One night after hearing scratching in the basement ceiling I lost it. Three am in the morning and I'm trying to look up all-night exterminators. Then I stumble on this sight. I think, well this is what the professionals use, let's just do it. (I was pretty sure we did't need 18lb but I was willing to insulate the walls with this stuff if it would help). Four days later, I've got a bucket and an evil grin as I bust it open. Three days later and there's no more scratching in the walls. Two weeks later, it's still silent and I can't find any droppings. Two months later, I still haven't heard anything, the dog hasn't alerted to anything, and there's no black greasy spots randomly appearing in places I know I've cleaned. Seriously this stuff works. If it doesn't work for you, you're doing it wrong.

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  • 5 of 5 stars  Contrac Rat
    By John in Union City, NJ on 05/11/2017

    This product is the best on the market. In fact I just sent it to my sister in Fla she could not believe it. In a week or two the rats were gone. In fact when she went to the canal by her house she would she them dead there. If you have RATS or MICE don't think about it, buy this product.

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  • 1 of 1 people found this review helpful:

    5 of 5 stars  Contrac Blox Rodenticide
    By C. in Chicago IL on 05/01/2017

    I am not a professional by any means, but, after following the instructions I had such success you would think otherwise. The truth be told--it was my son's project. I am terrified of of these creatures. My son waited patiently and after filling the Protecta Mouse Bait Station twice, they started dropping dead everywhere. The product DELIVERED in spite of my youngest son who chooses to eat everywhere in the house and thereby creating optional food sources.

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Most Helpful Q&A's

06/02/2011 Michael

QWhat are the new regulations on rodent products that go into effect on June 4th, 2011?

AThe federal government has decided that certain types of rodenticides should not be sold in the same manner they have been after June 4, 2011.  These regulations were passed to try to prevent over the counter sales of rodenticides to homeowners and minimize secondary poisoning and misuse of rodenticides.  Unfortunately too many people have placed rodenticides in locations they should not be, such as easy to access places that children and pets can easily get to.  Basically all of the smaller quantities of rodent bait that you have been able to purchase over the counter will no longer be available.  You will only be able to purchase bait already inside a rodent station that is a one time use product.  It will come pre-baited in a sealed rodent station.  This will be the general rule for big box stores like Wal-Mart and Home Depot.  For a specialty store like ourselves, Do My Own Pest Control, we will no longer be able to sell certain rodent place packs, liquid rodenticides, or bait blox in smaller quantities than 16 pounds.  This was passed to discourage homeowners from purchasing rodenticides since they have to now purchase them in large quantities.  Most homeowners do not need 16 lbs worth of place packs.  We will be able to continue to sell the current stock that we have of currently labeled product while supplies last.  However, after June 4th, once we sell out of our current stock and start receiving newly manufactured bait, we will no longer be able to sell it in less than 16lb increments.  There will be some baits that we can continue to sell in smaller quantities but they will be very few and only the ones that have a minimal secondary poisoning risk.

65 of 68 people found this answer helpful.
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08/17/2009 Bonita

QWhat happens to mice after they eat Contrac Blox?
I live in a mobile home and I purchased Contrac Blox and scattered it under my home. What happens to the mice after they eat it? How long does it take for them to die? Do they need water for this product to work?


Contrac Blox is an anti-coagulant which means once the mice eat this product they begin to bleed to death from the inside.  The mice first become sick, and then grow tired and weak and pass in their sleep.  It can take anywhere from a few hours to a few days depending on how much the mice have eaten.  They do not need water for the product to work.

59 of 60 people found this answer helpful.
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09/19/2011 Kme from Lee, Nh

QIs secondary poisoning an issue for cats when using Contrac Blox rodenticide?
We have mice in unfinished areas of our home (garage, basement, and attic) and we have placed bait boxes with Bell’s Contrac in these areas. We are not concerned about primary poisoning with our cats since they not allowed in these areas (and the poison is in boxes that the cats could not even fit into). However, my concern is about secondary poisoning. If a mouse somehow made it to a part of the house where the cats are and one of the cats ate the mouse, could it get secondary poisoning from Contrac? I would really appreciate some feedback as I have received mix answers from asking around, including our vet who was not really sure and suggested we contact you all. Thank you!

AThe risk of secondary poisoning with Contrac Blox is very minimal. A mouse only consumes a very small amount of bait at a time and passes it very quickly only keeping a smaller amount in their liver until they succumb to the effects of the bait. A cat would have to actually eat 20-30 mice that have consumed the bait for it to have an effect. In most cases well fed domesticated animals will not actually eat a mouse or a rat that they come across. Instead they will play with it, chew it and then leave it behind.

53 of 56 people found this answer helpful.
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04/30/2010 Craig

QWhich rodent bait is best for mice in a house that has two dogs?
I have mice in my house and was wondering which poison is better, Final Blox or Contrac Blox for me? I was reading the info on both and do not really know what the difference is, since they both claim to be the best, which confuses me since they are made by the same company. So my question is which one is best for mice in a house that has two dogs? The bait stations will be placed in areas of the house that the dogs can not get to (attic/basement).

AContrac Blox is usually preferred in homes with pets and/or children as there is a readily available antidote in the event of accidental ingestion and because of the reduced risk of secondary poisonings (if one of your dogs were to eat a poisoned mouse). Final Blox is used when a fast clean out is needed as it will kill the rodents a bit faster than the Contrac Blox. Final Blox does have a higher risk of secondary poisoning. We recommend that you use tamper resistant bait stations that will help stop accidental poisonings of non-target animals no matter which bait you select.

28 of 35 people found this answer helpful.
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07/02/2015 Andrew from Brockville, Ontario

QHow lethal is Contrac Blox if injested by a canine?
Just wondering if my math is right each blox contains about 1.4mg of Bromadiolone? and bromadiolone is lethal at 10mg per 1 kg body weight? so a 10kg dog would need to eat roughly 70 blox to be fatal? 0.005% of (28 grams) = 1.4 milligrams

AEach blox of Contrac is 28 grams which equal 2800mg. If your pet ate an actual blox, I wouldn't take the chance of figuring it out because the minimum amount could be lethal. It would be best to take your pet to the vet and have him/her take a look and/or administer the antidote which is Vitamin K1.

22 of 29 people found this answer helpful.
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Most Recent Customer Questions

12/29/2016 Dave from Calgary

QHow come the mice are not eating the Contrac Blox?
I'm in pest control and have went back to this job numerous times they have no food laying around and there is no feeding on the contrac blox I'm stumped they won't even go for snap traps...


There are many reasons why rodents may not be attracted to a bait such as Contrac Blox. One very common reason is that the bait is not fresh; baits should be used within 1 year of opening, and stations should be changed every 30 days for the best acceptance. You should also be sure to wear gloves when servicing bait stations and handling rodenticides. This not only protects the person handling the bait and stations from contaminants and possible disease, but it also keeps human scent and oils off the bait so as not to deter the rodents from it.

It can be difficult to locate competing food sources. Mice will travel up to about 10-20 feet for food from their nesting site, while rats will travel much farther, 50-100 feet from their nesting site. Bait placements should be close enough together to allow easy access to the bait. Keep in mind also that if this is a service call, then you have not been there to monitor the sanitation all the time, so there could be trash or other food sources that have been left out. All food storage areas, food containers, areas around applicances, and trash receptacles should be checked for rodent activity.

If you have used fresh bait multiple times and are unable to locate and competing food sources but still see new rodent activity, then you may want to consider using a different bait. Just like people, rodents can prefer one food over another. Soft Baits such as First Strike have very high palatability and are great to rotate with something like Contrac. 

1 of 1 people found this answer helpful.
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10/31/2016 Hector from Anaheim, California

QDoes Contract Blox have any secondary effect on koi fish from rats that die in the pond?


Contrac Blox Rodenticide and other similar products do have active ingredients that are toxic to fish, however secondary poisoning from a rodent that consumed the bait is generally only a concern with birds of prey or other scavengers that would actually eat the rodents who had consumed the bait. Per the SDS: "Do not apply this product directly to water or to areas where surface water is present or ot intertidal areas below the mean high water mark. Runoff also may be hazardous to aquatic organisms in water adjacent to treated areas...Bromadialone water solubility is extremely low (<0.1mg/l)."

We would recommend not using rodenticides near the pond or in a way that may contaminate the pond. You could use snap traps inside a bait station in areas outdoors where you do not wish to use rodenticides, such as the EZ Snap Rat Bait Station.

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09/21/2016 Beth from Indianapolis

QHow many blocks come in each pail of Contrac Blox?


Contrac Blox come in two different sizes. Each 4 lb. pail contains approx. 64 (28 gram each) 2 in. x 1 in. x 1 in. blox.
Each 18 lb. pail contains about 288 blox.

1 of 1 people found this answer helpful.
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08/27/2016 Carl from Tx

QHow many blocks are in the 18 lb buckets of Contrac?


There are approximately 288 blocks of Contrac Blox in the 18 lb pail.

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07/20/2016 Mary from Texas

QCan I use Contrac Blox Rodenticide for rats in my attic?
I have rats in the attic. Can I use this? Will they die in the attic and how likely is it that the rats actually live up there instead of just coming in every now and then?


We do not recommend baiting for rodents indoors as the bait can draw in insects. We would recommend snap traps or glueboards indoors. Rodents will go back and forth looking for food and harborage supplies. We recommend to also try and find out where they are entering and seal up those areas.

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06/29/2016 Johnny from Memphis, Tn.

QIs it safe (within the label and the law) to place Contrac blox above a drop ceiling in a restaurant?
Is it within the label and the law to pop a few ceiling tiles out of a drop ceiling in a restaurant and scatter a few blox around for rats? I am aware that I would have to deal with the odor. I have been told that the blox must be secured in a station of some sort but the label says nothing about that.


By law Contrac Blox Rodenticide needs to be used inside a bait station, we would not recommend to toss loose blox in the drop ceiling. We would recommend using traps instead.

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06/01/2016 Ann from Tn

QAre chipmunks attracted to Contrac Blox Rodenticide?
Already using traps for chipmunks but need more in the arsenal.


We cannot recommend that you use Contrac Blox Rodenticide or any other baits for chipmunk control since these products are not registered for that use. There are food attractants in any rodenticide that may be attractive to non-target animals, which is part of the reason these baits should be used in tamper-resistant stations. We can only recommend trapping and repellents for chipmunk control. You may want to contact your local Wildlife/Animal Control Department for any other available options in your area.

Chipmunk Control 

0 of 1 people found this answer helpful.
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05/28/2016 Dennis from Palm Beach, Fl

QIs there any secondary poisoning of chickens for Contrac Blox if they consume the rodents feces?
I raise chickens and I am concerned about the rat turds left behind that can be consumed by chickens? Are the turds harmful to chickens? Its not their favorite food, but I do think they eat them sometimes. On a side note, I have the UV Contrac and, although not the primary intention, you can use a UV light to tell if you got it off your hands completely. I had to wash my hands 3 times before it was completely gone.


The chances of secondary poisoning by chickens consuming the feces left behind by rodents that consumed Contrac Blox is extremely slim. Normally animals have to consume multiple entire rodents in order to ingest enough poison to have any effects. Unless the chickens are getting direct access to the poison itself there should not be any issue if they consume a few pellets here and there. 

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05/27/2016 Douglas from Oh

QWill Contrac bait attract and kill moles?


We do not advise using Contrac Blox Rodenticide to treat for moles as it is not labeled to used for that treatment. Moles' primary food source is actually earthworms, and they stay underground to feed, so it is unlikely they would even consume a bait such as Contrac. Please refer to our guide on How to get rid of Moles to help further asisst you. 

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03/11/2016 Jacke from Boston, Ma

QWill Contrac Blox work on squirrels? If so, how?
Have squirrels in a wall-not sure of the entry point. How would I use this product to gt them to leave the wall?


Unfortunately Contrac Blox is only labeled for rodents like rats and mice.  Therefore we cannot recommend that it be used for ground squirrels.  We do not have any products that are labeled for squirrels specifically other than live catch traps.

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