And, since patients have to inject it into themselves, I think it's great that you put together a demo kit to teach them how to do it.
I can understand that your demo kits don't have the real drug in them. I mean, this is an expensive monoclonal antibody with a short shelf life. You don't want it sitting in a doctor's cabinet collecting dust. So it makes sense to have a non-drug demo for teaching purposes.
There are a lot ways this could have been labeled. Like "does not contain real drug" or "do not inject the demo product" or "for demonstration only, do not inject."
But, in all honesty, putting "not for use in humans" on the demo drug's packaging IS NOT going to inspire patient confidence in your product.