For the powdered ivermectin at above reccomended doses... is that to be given once a month?

You can give every 45 days.  However, just found out from Thomas Labs that they won't be making the powder any longer.  The Sheep drench ivermectin can be given undiluted.  Here is a good link and the dosages are accurate.  Keep in mind a lot of folks on here have given the Ivomec undiluted orally and they have not had problems, but these dosages are accurate:

http://www.dogaware.com/health/ivomec.html
     

Ivomec Dosage Instructions for Heartworm Prevention

I don't endorse the extra-label use of liquid ivermectin for dogs, but I'm concerned that people are using it improperly, subjecting their dogs to potentially dangerous levels (for some dogs) of ivermectin. See below for information on how to properly dilute Ivermectin 1% solution in order to make it safe to use for dogs. You can use 0.08% sheep drench undiluted.

I have also worked out the amount of ivermectin in Acarexx, used to treat ear mites in cats (and off-label in dogs), which might be useful for people who cannot otherwise afford to treat a large number of dogs. Contact me privately for more information (my contact information is at the bottom of the page).

• Contents
  • Introduction
  • Ivermectin Sensitivity
  • Ivermectin Efficacy
  • Directions for using 0.08% sheep drench
  • Directions for Making 30:1 Dilution of 1% solution
  • Directions for Making 9:1 Dilution of 1% solution
  • Directions for using Ivermectin powder
  • Buy Ivermectin, Propylene Glycol and Glycerin
  • About J&R Enterprises Ivermectin Blend
  • How the Calculations Were Done

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Disclaimer: I am not a veterinarian, nor do I have any formal training in any medical field. The information presented here is not meant to replace your vet's advice or prescribed medications, but only to suggest additional options to explore, based on your dog's condition.

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Introduction

Liquid ivermectin (Ivomec) is available in 1% injectable solution for treating cattle and pigs, and in 0.08% oral solution for treating sheep (the 0.27% solution has been discontinued). In most cases, you will need a syringe (no needle) that measures to the tenth of a cc to administer.

Ivermectin is now also available in powder form mixed with ground corn, designed for pigs. The dosage could be incorrect if the ivermectin is not evenly mixed with the powder.

Ivermectin 0.08% solution made for sheep can be used undiluted. An 8 oz (236 ml) bottle of ivermectin 0.08% solution costs around $28, and would be enough to treat 70,000 pounds of dogs.

Ivermectin 1% solution