Why on earth would you want to get an MBA before medical school? Here is how it would work:
Step 1: get MBA, learn accounting, corporate finance, operations management, etc. etc.
Step 2: Basic sciences: memorize minutiae of biochemistry, signaling pathways, drugs, the embryology of the pituitary. This will consume all your time.
Step3: Clinicals: work insane hours in an antinquated system doing work that should be done by computers. Work in a rigid hierarchy that has little room for initiative even if you had the time. Your time is entirely absorbed with clinical work.
Step 4: Residency: Same as step 3 except consider it step 3 on steroids.
Now, 7 yrs later you might have a need to apply a few of the things from your MBA program; however, more likely, your time is consumed with clinical medicine.
Nine years later -- you have completed training, have done a few years of clinical work are looking for the next step. So now, your attention turns once again to business and your MBA knowledge as long since atrophied.
The short story is that there is no advantage to getting an MBA prior to medical school. It will be a minimum of seven years before you apply what you learned. Also, you might take a path that does not require an MBA. Thus, getting an MBA "just in case" is a very costly approach. Get one if and when you need it.