There was a thread about this not too long ago, but I can't find it. Oh well... (editd to add:
here is is)
The ACGME requires 6 off-service months: 2 neuro and 4 months of medicine (or peds or FM). One of the medicine months can be EM.
Programs vary widely in how they implement this. Some programs have their psych interns in the MICU, others do all outpatient. Most strike a balance in-between.
For example, at my program, we do 2 months of either medicine or peds wards (your choice), one month of adult or peds ER, and a med or peds specialty month, which is usually a lighter non-call month. (I'm doing palliative care, which is consults+clinic, 9-5 M-F) Then the 2 neuro months.
When you are rotating on these services, you are usually expected to function as an intern in these respective schedules. So you are on call along with the medicine interns, doing everything they do. The exception here is that we only take call for one of the two neuro months (which at first I felt guilty about, until I learned that the neuro residents gets to slack off when they have to rotate through psych consults.)
Medicine here is Q5, which means we are on call every 5th night. Like many programs are doing nowadays, we have a a night-float who takes admissions after a certain time though, so you're not taking admissions all night.