Did some research since my last post. These sites are rather interesting to read.
if you look at the patent information for Assurity, the patent states the carrier to be benzyl alcohol. Benzyl alcohol is a wicked ingredient despite also being considered “organic”. It is a solvent for inks, paints, lacquers and epoxy resins. You can even use it as a photo developer
Assurity for Cats by Elanco is the first pet product to contain spinetoram. It will only be sold through vet offices, which is a marketing choice that some companies use to keep the costs high on their products and give consumers a sense of quality
I sent Elanco two e-mail stating the problems we encountered with Assurity, along with photos. Also ask for data on their study they did with cats prior to release of this product. (got no answer on that one), but gave a case number (6303) and a number to call. Wonder if case numbers started at 1
hope this enlightens pet owners when choosing