The patient was scheduled to receive medication daily.
- the main (copula) verb and "scheduled" its complement/object?
- Or the auxiliary of a passive voice verb group, where "scheduled" is the main verb?
I'm leaning towards (1), mainly because I tend to think that a passive clause must always be convertible to an active clause, and "the doctor scheduled the patient" sounds unnatural to my non-native ears. I usually think of events being scheduled (e.g. the meeting was scheduled), not people.