Mystery Solved

So, what happened to my lady in the post "You're the Sleuth"?

One of the side effects of Droperidol (Inapsine) is excessive sedation and mental depression. Another common side effect is hypotension.

These side effects can be especially pronounced in the elderly.

I called the hospital the next day to see how she was doing. It turns out she experienced this sudden deterioration in condition for a few hours, and then was back to her normal self when the drug wore off.
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Was that what you suspected? It sure wasn't what I thought; I was sure she had a brain bleed, neurothrombus or another acute neurological pathology. Thank heavens it was the R.N. and not me who pushed the Inapsine...