Qualifications
Ay, here's the rub. You're not a medical doctor, but you have to go to school like one. In addition to obtaining your bachelor's, you'll need to earn your Pharm.D. (something like a PhD but with more lower-case letters) from an accredited school of pharmacy.
To even get into such a program in the first place, you will need to complete two years of specific professional study—something in the math and sciences. The Pharm.D. program should take four years to complete, after which you may (if you so choose) get even further training in a residency program or fellowship. By the end of all that schooling, you should finally be able to move a pill from one bottle to another.