Any major will do. In fact, you may be at an advantage doing a non-bio major.
Have you also considered the PharmD/MBA? A few of my friends are going through this program now vs. the MD/MBA to save a few years out of school. Also, in the business world, PharmD is a respected Doctorate degree, albeit still 'lower' than the MD. If you are going to work for a company, this would be a lower salary, but if you are going to run your own business, it wouldn't matter.