If that's not possible, look for an MSN program with a good, broad basis in administration. Also, it is important to understand what you want to do with it and look into what is required. In some settings, an MSN is mandatory...often in academic hospitals where this is important. In other places, an MBA is vital for advancement beyond the unit manager level.
have a joint MSN/MBA program that requries a modest amount more work than either.
Also, some MBA's require some prereq in business, accounting, etc. and this could be a factor in your decision because you might need to take these courses first.
The upshot is simple: do something. Either way, you will be better prepared.