Contrac Blox Rodenticide

$81.63 - $97.40

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4.5 out of 5 stars Rating: 4.7

180 Reviews | 80 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 lbs. bucket (18 lbs)

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   147
4 stars   23
3 stars   4
2 stars   3
1 star   3

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Most Helpful Customer Reviews
  • 82 of 91 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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  • 67 of 68 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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  • 43 of 44 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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  • 40 of 40 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  Contrac Blox
    By Frank in Chicago, IL on 11/07/2017

    The Do My Own website has excellent technical information relating to their various products. Allows you to make an informed decision regarding product selection. I have been using Contrac Blox for years and am pleased with the results. Living in Chicago (the rat capital of the country) I put the product to good use. I sure wish they had a product to sterilize the rats.

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  • 5 of 5 stars  Great product
    By Todd in Nashville Tennessee on 10/20/2017

    We use it to control rats and mice in our stables and have practically stopped the rodent infestation

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  • 5 of 5 stars  Good stuff!
    By Bryon in Bridgeport, tx on 10/06/2017

    Within 1 week, 8 of the 20 blocks i put out were completely gone, and found two baby mice dead. By two weeks I was finding 2 dead mice a day laying on the floor. Tossed a whole bunch under the trailer home. I've no doubt the mice infestation will be solved within a months time.

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  • 5 of 5 stars  It works great!
    By Joe in Byron Center, MI on 09/01/2017

    It works great!

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  • 5 of 5 stars  Two thumbs up --use before expiration date
    By Christina in DC on 08/25/2017

    Living in DC this was a must. Read reviews from others in big cities and decided to give this a try. Well worth the price! We didn't have any activity for two years, despite being in a DC row house with a neighbor that...well let me keep this on a positive note, the stuff works! We never had it in the house, instead placed it around the outside perimeter. Recently noticed activity, for the first time in two years I saw a mouse in the backyard. We put more blocks outside. Realized that they are now expired. Save money, do it yourself, but pay attention to the expiration date.

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  • 5 of 5 stars  Contrac rodenticide
    By Jd in WILLS POINT TEXAS 75169 on 08/18/2017

    I live in the country. I have 9 stations using contracts over 2 years. My wife is a HAPPY CAMPER

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  • 1 of 1 people found this review helpful:

    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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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.

66 of 69 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.

64 of 67 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.

58 of 62 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.

32 of 39 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.

24 of 32 people found this answer helpful.
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Most Recent Customer Questions

05/26/2017 James from Fresno, Ca

QAre Contrac Blox Rodenticide effective for controlling voles?


Contrac Blox Rodenticide are not labeled for voles. We recommend Kaput Rat and Mouse Bait which are labeled to treat for Voles. 

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04/05/2017 Dennis from Palm Beach, Fl

QIs Contrac toxic to opossums?
I have a Bucket of Contrac that has been very effective with the rats. Recently, a possum has been breaking into the bait stations and stealing the bait. Will this harm the possum? This is a big problem for me because I have to clean up his crumbs so that other animals (chickens) don't get into them.


Contrac Blox Rodenticide is not labeled for possums but if they were to eat enough of it it could harm them.  It doesn't sound like your stations are secure at all to the ground or to some other structure.  You can use liquid nails and affix the station on a 1 x 1 foot paver you can buy from home depot.  This well prevent them from being moved.  Also, if you make sure the bait is secured on the rods, and the station is secure, it should prevent the possum from being able to work the bait free from the rods.

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03/29/2017 Jan from Fort Worth, Tx

QI think my little dog may have licked one of the Contrac blox. Will this harm her?


Contrac Blox can be toxic to animals if enough is consumed, although an antidote, Vitamin K1 is readily available from your vet.  If you believe your pet consumed any amount of this product, it is important to contact your vet or pet poison control as soon as possible. 

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01/12/2017 Rob from Everett, Wa

QIf Contrac Blox have been placed within the root drip zone of pear and other fruit trees, is the fruit from these trees still safe for human consumption?


If the Contrac Blox have been used properly within bait stations, then there should be no concern about the bait contaminating any edibles. The anti-coagulant active ingredient in Contrac is not absorbed systemically into plants.

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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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12/27/2016 Tracy from Cornish Flat, New Hampshire

QWill Contrac Blox bait fit triangle stations?


We apologize, but the term "triangle stations" is a little vague.  We can tell you that the Contrac Blox are a standard size and will fit into most rodent bait stations, including triangle-shaped stations like the Protecta RTU Mouse Bait Station.  

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12/22/2016 Douglas from Street, Maryland

QIs there a difference between "voles" and "meadow voles"?
I'm confused since there is a discrepancy in the description of Contrac and in a question/answer from Mike in Caseyville, Il. In the description of Contrac it includes "meadow voles", yet in your response to Mike, you say to use Kaput. Which is preferred? We have been using Kaput and it is being eaten, but not sure of its effectiveness, since they seem to keep eating the bait. However, we may have a large infestation and it will take some time to eliminate all of them. Do you still recommend the Kaput over Contrac?


The question you are referring to may be outdated, so we will be sure to look into that.  Contrac previously was not labeled for voles at all, but the labeling has changed in the past couple of years to include meadow voles (the most common vole species) in addition to rats and mice.  Before this change was made, Kaput Rat & Mouse Bait and Kaput Combo Mini Blocks were the only rodent baits that we carried that were labeled for voles.  Either Kaput or Contrac will work to eradicate voles, but as you said, if the population is very large, complete control will take some time.  It is a good idea to continue to make the bait available as long as the voles are still eating it.  We have a vole control guide on our site here that may be helpful. 

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12/18/2016 Joe from Detroit Mi

QCould I use Contrac Blox instead of Terad3?
I am looking for something that comes in an 18-lb. pail. There are pets in the area.


Contrac Blox would be a good option to replace the Terad3 blox. Be sure to continue using bait stations so that no non-target animals come in contact with it. Secondary poisoning is very minimal with Contrac and an antidote to the poison (vitamin K1) is readily available.

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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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