Ivermectin (22,23-dihydroavermectin B1a + 22,23-dihydroavermectin B1b) is a broad-spectrum anti-parasitic medication, traditionally used against
worms in cows, dogs, horses and a few other animals.  Ivermectin also goes under some other brand names such as Stromectol® in the United
States, Mectizan® in Canada and Ivexterm® in Mexico.

While ivermectin works effectively and relatively safely in the species listed above (with the exception of a few breeds of dogs), it
can be very toxic
to most reptiles and especially deadly to many chelonians.  It has been brought to my attention by a friend who happens to be an experienced
snake keeper and active conservationist for over 20 yrs of mine that ivermection
can be used safely with many species of snakes.

That being said - The manufacture also states that reptiles under no circumstances should be injected with ivermectin

I personally know a few people that have had their Bearded Dragons treated for worms with ivermectin and they have all ended tragically with the
dragon dying a slow death.  Organs begain shutting down and ultimately requiring their dragon to be euthanized :(

It also has contradictions with animals that have been treated with diazepam within 10 days after being dosed with ivermectin

The dosing that is required in order to be effective in reptiles
can be lethal.  There are other safer options for the treatment of protozoans,
ectoparasites and endoparasites.  Personally - I wouldn't chance it.

Melissa Kaplan's
site has a page discussing mites and ivermectin and is a good read (you will find it a little more than half way down the page).  
I encourage you to read more and do some research on this subject to ensure that nothing dangerous happens.
Written by: Robin Moniz 2008
Dr. Fredrick L. Frye D.V.M., M.S Biomedical and Surgical Aspects of Captive Reptile Husbandry
Wikipedia.org Encylopedia
Melissa Kaplan anapsid.org
Suggested reading:
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