Ethylene glycol is antifreeze, and is toxic. Polyethylene glycol (PEG) is a ubiquitous ingredient in a wide variety of consumer products, including many medications.
So is "America's Frontline Doctors" lying out of ignorance or lying intentionally? If they really are doctors and know what's in many of the medications they prescribe, I think they are lying intentionally, hoping whatever court handles their suit is ignorant.
But whether lying out of ignorance or lying intentionally, this is yet another illustration of why I label sources like "America's Frontline Doctors" pig crap and dismiss them with mockery.