B.Com

Firstly are you a B Pharm / M Pharm, as you need to be a qualified pharmacist to register your pharmacy and obtain a Pharmacy License. Or do you know someone who is B Pharm / M Pharm and is able to + willing to lend you his/her name against goodwill payment (not ethical but many follow this route in India) so that you can obtain a Pharmacy License.
Secondly you will need to decide on your investment. Your basic need will be a shop if you are targeting a local area (here you can buy one or rent one). Just make sure you do your maths for shop (buy/rent) + inventory.
Thirdly network with a Doctor / Hospital so that you can "informally tie-up" with them, this is the easiest way to access customer base (again not ethical but most follow this route), and
Finally you need some cash to stock up your shop, as credit will be tough for a new store.

Hi Mansi,
Broadly speaking, there is not much difference between the curriculum of a B. Com and a BBA degree, in the Indian context.
When a BBA does have slightly more focus towards management subjects, "B. Com" gives a broader overview.
Important thing is , to get admission into a reputed B School you will have to crack CAT/XAT/GMAT/SNAP etc entrance exams.
And look at the paradox, these tests have nothing to do with ones knowledge/understanding of management! Bitter truth, but yes thats the reality!
So, go through the syllabus of both BBA & B.com and then make a choice. In the end you will have to study Quant, Verbal, logical reasoning to crack MBA entrance exams.
Good Luck.