Hi rxlea,
I'm starting as a DrPH student this fall, and while searching for a "PhD minor" (requirement in my program), I saw a lot of dual degree options with the MPH (various PhD programs and a joint JD/MPH). I just checked the website, and there is an MD/MPH option, but it didn't say anything about the PharmD; however, I don't think that means that it isn't possible. The public health faculty/admin are really receptive to emails - you might want to try contacting them.
Also check this out for more general dual degree info:
http://www.publichealth.arizona.edu/AcademicPrograms/DualDegrees.aspx.
P.S. Did you decide where you're living yet? I'm moving out next week, and will be sticking to grad housing for year one - I'm not sure if that was a brilliant or stupid decision, but it at least spared me housing stress.