What weightlessness feels like on Zero-G planes

The medication they took was probably Scopolamine.  It's usually done as a patch but I like the idea of an injection, that would likely be significantly more potent and better at stopping clouds of vomit inside the aircraft.

The dry mouth is because its also quite good at inhibiting the release of secretions in the mouth, nose, etc.  It also causes drowsiness, euphoria and sometimes hallucinations, so I suspect a solid IM/IV/Sub dose would probably be noticeable to someone who doesn't usually use Anticholinergic meds.