Conflicting Fenbendazole dosages....

[Brahmaking]

I feel like I have read all that there is on the internet regarding Fenbendazole dosages and It seems like there is a different dose on every related page.
Can someone pls explain if I'm missing something?

The vet's handbook has this and most of the recommendations seem to fit in within this generous range:
http://www.poultrydvm.com/drugs/fenbendazole
For chickens: 20-50 mg/kg given orally for 3 to 5 days, repeated again for another 3-5 days in 10 days.

Yet any official Fenbendazole or Panacur documentation has a dose of 1 mg fenbendazole per kg body
https://ec.europa.eu/health/documents/community-register/2016/20160826135429/anx_135429_en.pdf
Chickens: The dose is 1 mg fenbendazole per kg body weight per day (equivalent to 0.005 ml Panacur AquaSol). This dose has to be administered on 5 consecutive days.
And same on this USDA doc https://www.ams.usda.gov/sites/default/files/media/Fenbendazole_TR_Final_05-13-2020.pdf

There seems to be a massive contradiction in the dosages, with the usual range of 20-50mg/kg being twenty to forty times higher than the formal dose..... Can anyone explain this pls?

For reference, I intend to use this on chickens, for tapeworms and will administer orally (not mixed with water), and will use a 10% suspension.
Any helps would be MASSIVELY apprecaited.

 

[DobieLover]

The low dose for 5 days only treats round worms and has no egg withdrawal.
Higher doses will treat other worm species with a 2 week egg withdrawal period.
Fenbendazole does not effectively remove all varieties of tapeworm. Praziquantel is a better choice.

 

[Lortiz]

I was equally confused and did much research about it. The difference is because the higher dose is the dose you should use if you are using the products made for other species, like Safe-Guard Goat dewormer or Safe-Guard horse dewormer paste. Using these products for chickens is off label. The only Fenbendazole product approved for chickens is Safe-Guard Aquasol or Panacur Aquasol. The formulation for Aquasol is different so the dose is much lower. Unfortunately, many chicken web sites reference the information from the Aquasol data sheets and thus are giving the wrong dose. Plus they say there is no egg withdrawal based on this but there are no tests on egg withdrawal using the other Fenbendazole products that are used off label. I called the manufacturer, Merck to clarify. The rep told me the dose was 50 mg/kg, but then said I should talk to their vet because she looked it up in a book but it wasn't info for their products. The vet explained that they are different formulations and he could not advise me about the dose using the other products because of that being off label use for chickens. The Aquasol products seem to be marketed to poultry production farms and are very expensive, and they aren't available where I live anyway. I would use the dosage info you found on PoultryDVM. Also note that you should not give this when your chickens are molting because it will cause the feathers to grow in abnormally. So for that reason, I am currently using Zimecterin Gold horse dewormer paste. But I prefer Safe-Guard Fenbendazole because it is very safe even at many times the recommended dosage.
http://www.poultrydvm.com/drugs/fenbendazole
For chickens: 20-50 mg/kg given orally for 3 to 5 days, repeated again for another 3-5 days in 10 days.

 

[Lortiz]

I feel like I have read all that there is on the internet regarding Fenbendazole dosages and It seems like there is a different dose on every related page.
Can someone pls explain if I'm missing something?

The vet's handbook has this and most of the recommendations seem to fit in within this generous range:
http://www.poultrydvm.com/drugs/fenbendazole
For chickens: 20-50 mg/kg given orally for 3 to 5 days, repeated again for another 3-5 days in 10 days.

Yet any official Fenbendazole or Panacur documentation has a dose of 1 mg fenbendazole per kg body
https://ec.europa.eu/health/documents/community-register/2016/20160826135429/anx_135429_en.pdf
Chickens: The dose is 1 mg fenbendazole per kg body weight per day (equivalent to 0.005 ml Panacur AquaSol). This dose has to be administered on 5 consecutive days.
And same on this USDA doc https://www.ams.usda.gov/sites/default/files/media/Fenbendazole_TR_Final_05-13-2020.pdf

There seems to be a massive contradiction in the dosages, with the usual range of 20-50mg/kg being twenty to forty times higher than the formal dose..... Can anyone explain this pls?

For reference, I intend to use this on chickens, for tapeworms and will administer orally (not mixed with water), and will use a 10% suspension.
Any helps would be MASSIVELY apprecaited.

Regarding administration, I have used both the 10% suspension and the 10% horse paste. You can individually dose with either product. It just depends what you are comfortable doing. I saw some suggestions that you could put paste on a piece of bread. That was messy and didn't go so well because they all wanted to try to get it and the paste doesn't soak in so it went flying. I did also try soaking bread with the suspension and that went better because at least it didn't get flung around when they were jostling to get it. I found it easier to put it directly in their mouths. Since there is such a wide safety margin you can use a rough amount of horse paste so you don't have to precisely measure it out. You can put it on your fingertip and scrape it on the inside of their beak. If you are comfortable dosing liquid correctly into their throat that would be the most accurate way. I have also mixed it in my chicken's feed. I feed my chickens fermented feed every morning and they love it, so I just added the correct amount of suspension and mixed it well. You could just wet whatever you usually feed. I calculated the amount for the total weight of my flock plus a little extra to make sure that if some eat less they still get enough. If you are using the higher end of the dose range you don't have to worry about that because they will get enough even if they eat half. I feel comfortable dosing Fenbendazole this way because of it being so safe in a wide range of doses, but I like to individually dose them when using other drugs like ivermectin.

 

[Bonnieboo]

I have Fenbendazole powder which I have used before as a successful wormer. Problem is I now need to worm them again and have forgotten the dose for 5 chickens.
I know I had instructions to mix a certain amount of powder into a kg of pellets (having first mixed in a couple of drops of olive oil) and the powder attaches to the pellets. Unfortunately bags of fenbendazole treated pellets aren't available in Australia so I really need the correct measurements. I really hope I can find someone who can help.