✪ FDA Approves Fenbendazole for Use in Laying Hens to Treat Large Roundworms and Cecal Worms ✪

[Winter Creek Coop]

I'm working on creating summary of info on fenbendazole & here's how I understand things thus far. If anyone spots something that needs revision, please give me a heads up!
___________________________

As Panacur AquaSol fenbendazole dewormer was being evaluated for use in chickens, this document was produced that has many details: Committee for Medicinal Products for Veterinary Use assessment report for Panacur AquaSol

From info on page 12, it looks like the dose for treating for adult Ascaridia galli (large roundworms) and Heterakis gallinarum (cecal worms, which can also carry blackhead disease) should be:
1 mg of fenbendazole per kg of bird's body weight, given for 5 consecutive days
(which is the same as 0.454 mg of fenbendazole per pound of bird's body weight.)
[Side note: Horses are normally dosed for worms at 5 to 10 mg of fenbendazole per kg of horse's body weight.]

Note: 3 kg (6.6 lbs) can be used as a very general weight for a backyard breed hen.

For measuring, you can use a very small syringe (1 mL is the same as 1 cc.), or you can just approximate that a pea-sized amount is 0.25 mL.

Here's how that should translate when using various products:

Panacur Aquasol liquid dewormer (for chickens and pigs)
has 200 mg of fenbendazole per 1 mL of liquid. If being precise, you would give 0.005 mL of liquid for each kg of bird's weight each day.

Safe-guard 10% liquid goat dewormer
has 100 mg of fenbendazole per 1 mL of liquid. (The bottle contains 125 mL total of liquid.] If being precise, you would give 0.01 mL of liquid for each kg of bird's weight each day.

Safe-guard and Panacur 10% paste horse dewormers
each have 100 mg of fenbendazole per 1 gram of paste and the tube contains a 25 grams total of paste. If being precise, for each kg of your bird's weight you would give 1% of 1/25th of the contents of the tube each day.

Bottom line:
You only need a tiny bit for deworming a single chicken.

Fenbendazole has a wide margin of safety, however, so some overdosing is not as risky as with many other medications.
My birds don't mind eating fenbendazole. Based on my experience and others', I'm thinking it is commonly safe to give a tiny pea-sized amount on a very small piece of bread to each chicken, and that amount is plenty to be effective if you give for 5 days.

Withdrawal times are listed on page 10, to use when dosing 1 mg/kg:
Eggs-- No withdrawal needed.
Meat-- 6 days.

---------------------------------------------------------------------------------
Alternate possible dosing based on one particular study--

Against large roundworms and cecal worms:
10 mg fenbendazole per kg of body weight for 3 consecutive days.

Against Raillietina (broad-headed tapeworms) and Syngamus trachea (gapeworms):
15 to 20 mg of fenbendazole per kg of body weight for 3 consecutive days.
* This highest dose would only be a little more than 1/2 mL for an average-size hen.
---------------------------------------------------------------------------------
I wanted to get this info added here, and will soon get it updated on my general Chicken Medicine Chart.

Great Info!

 

[casportpony]

Safe-guard and Panacur 10% paste horse dewormers
each have 100 mg of fenbendazole per 1 gram of paste and the tube contains a 25 grams total of paste. If being precise, for each kg of your bird's weight you would give 1% of 1/25th of the contents of the tube each day.

It's even easier than this, 1 ml of paste weighs one gram, so one can use it just like the liquid for goats.

Amounts shown below will require egg withdrawal!​

This was my experiment

Weighed empty 6cc (ml) syringe


Filled with Panacur 10% paste and weighed. Difference is 6 grams, so 6 grams = 6cc's (ml)

From left to right:
Small = 10mg ( .1cc) = enough for a 200 gram (7 ounce) bird at 50mg/kg
Medium = 25mg (.25cc) = enough for a 500 gram (17 ounce) bird at 50mg/kg
Large = 50mg ( .5cc) = enough for a 1000 gram (35 ounce) bird at 50mg/kg
50 mg/kg is at the high end of the recommended dose for birds, but it is what my vets recommended.

From Plumb's Veterinary Drug Handbook - 7th Edition

 

[Eggcessive]

Here is another choice of fenbendazole low dose that can be given over 5 days that may be close to the Aquasol dosage of 1 mg per kg but more affordable:
https://www.jefferspet.com/products...MIpIud_ruV9AIVt3NvBB3XwgIjEAQYASABEgKpnfD_BwE
It is not specified for capillary (thread worms.) But it says it can treat roundworms, cecal and others.