Ivermectin Pour on Dosage (Math Question)

[CharlieBaby]

Ahhh, the math! I realize dosing has been discussed in other threads, but I'm wondering if someone would be willing to explain the math behind pour-on Ivermectin dosing. It's bugging me that I can't figure out the link.

Ivermectin dose (A): The correct dosage of topical Ivermectin for chickens is .045 mL/lb (sources: here, here, and here). Chickens need .045 mL of active ingredient Ivermectin per pound of body weight.

Pour-on formula (B): I purchased Durvet Ivermectin Pour-On, which has 5 mg of Ivermectin per mL of solution. In other words, this particular form contains Ivermectin at a strength of 5 mg/mL, with the rest of the formulation being inactive ingredients.

Math trouble: This is where I'm getting stuck. I'm not sure how to reach the desired dose of .045 mL/lb using the pour on. The units are obviously different (mL/lb vs. mg/ML).

How does she do it? I see that Casportpony recommends .09 mL/lb of pour on Ivermectin, which equals .45 mL for a 5 pound hen (source: here). I assume this means that by applying .45 mL of Durvet Ivermectin Pour-On on my 5 pound hen, I'll be reaching the recommended dose of .045 mL active ingredient Ivermectin per pound of body weight...

Can someone explain how they converted the general recommended topical ivermectin dose (A) to the correct pour-on formula dose (B) -- how did you get from A to B?

 

[Wyorp Rock]

I think you may be overcomplicating things.

https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/

Pour On has 5mg Ivermectin/ml, dosing is 1mg/kg
1 ÷ 2.2 x 1÷ 5= 0.09ml per pound of weight.


1% Injectable has 10mg Ivermectin/ml, dosing is 1mg/kg
1 ÷ 2.2 x 1 ÷ 10= 0.045ml per pound of weight.

The dose is not drops. Birds should be weighed or at least have their weights guessed and the proper amount should be given. I have bolded the amount I use.

There are two types, one is injectable, the other is a pour on. The doses are different.

The max dose for 1% Ivermectin is 1 mg/kg which is 0.045 ml per pound. This can be given orally, by injection, or topically.
A five pound hen would get 0.23 ml.

The minimum effective dose for 1% Ivermectin is 0.2 mg/kg which is 0.009 ml per pound. This can be given orally, by injection, or topically.
A five pound hen would get 0.045 ml

The max dose for Pour On Ivermectin is 1 mg/kg which is 0.09 ml per pound. This is given topically only.​

A five pound hen would get 0.45 ml.

The minimum effective dose for Pour On Ivermectin is 0.5 mg/kg, which is 0.045 ml per pound. This is given topically only.
A five pound hen would get 0.23 ml

DO NOT USE this on your dogs unless you are working with a vet!​