Is it possible for a student who is in a Ph.D. Program now to switch into the M.D./Ph.D. Program?

It is possible; you would have to apply to medical school just like any other applicant and check off the box on the AMCAS application for "interest in MSTP". The application would go through the initial screening process (grades, MCATs, etc.) and if positive, would be sent to us to set up an interview. Depending on your research background, it could improve your chances for getting into the MSTP program. But in general, you would have to do reasonably well (30+) on the MCATs and have some element of prior experience in medically-related activities (volunteer work, shadowing a doctor, medical research) to succeed at making it through the medical school admission process.  more