In my experience, not a single pharmacy out there uses pure EO. Some use Sesame oil, some use GSO, etc....
EO is still not FDA approved for use and yet it is still used as a vehicle for IM injectables. It's pretty funny because there's a lot of info now that points to biomarkers of exposure to ethanol.
That is to say ethanol interaction with the lipid bilayer of the plasma membrane actually creates EO, and that toxic effect is thereafter mediated by this chemical.