FLCCC recommends taking ivermectin with or following a meal to openhanded bioavailability (that has made a difference in blood concentrations of the drug in studies)
Here is a good breakdown of the amount of ivermectin in a tube of https://freerepublic.com/~pollard/ and gives the math that supports the 1:1 dosing for humans.
In short, the preventative dose of ivm according to FLCCC .09mg/lb
There is 113.6 mg ivermectin in a Durvet tube (6.08g tube of 1.87% paste)
113.6 / 1250lbs equals .09 mg/lb (the treatment dose)
What I would check if I had a different brand is that it is 6.08g, is 1.87% and contains only ivm. If it is larger or smaller you’ll have to do some calculations.
I have the human form but for preventative my husband has been taking it for 5 months with no ill effect.
*openhanded = enhance