The "oral horse paste" syringe is effective, and available at any farm ranch store such as Atwoods or Tractor supply. Dose per weight - tastes like ass more than apple, but butter up some toast with it and it is easier to keep down.
that's without a script, just imply you have a horse. I used it for decades on my pets and other animals also, cheaper than a vet script for each silly little creature.
Now I just take it when the animals get it.