i've been a Family Physician for 20 years. i was really struck by your question because i majored in Business Management then went to Medical School.
first, going to medical school doesn't limit your college major choice. feel free to choose anything that interests you. however, i will admit that most of my medical school classmates held science degrees, usually biology or chemistry.
no matter your degree choice you'll need to take all of the required pre-medical courses. many of those requirements will overlap with those of the Biology degree path. but some won't. fewer still overlap with the Business degree path.
so if you plan to graduate in the traditional 4 years you'll need to either take a few courses over the summers or take a heavier course load some semesters. of course, you also could do what i did which was to graduate in 5 years.
my best suggestion to you would be to discuss this with your campus Health Professions Advisor. one important question you should ask at that time is what non-required college courses would be beneficial to your future career.