I have a kitten rescue and specialize in bottle fed babies. I have used Panacur for years on my older cats. I buy the horse Panacur at my Vet supply and the dosage is 0.02/lb. My Vet also gave me liquid Panacur for worms in my 2-3 wk old kittens. I have never had any adverse reaction from Panacur.
I use the panacur horse paste to worm my cats and dogs. How I measure it is I lay a thin line on their tongue that is the width of their tongue. That is what my vet uses and that is how he doses it. My dogs and cats do not like how it tastes and they will try to shake it out of their mouth. After you lay the line firmly grab their jaw and close their mouth so that they will swallow it.