I agree with the previous poster. In my personal statement, I described my areas or interest, but also made reference to the fact that I will be exposed to many areas in pharmacy school, and intend to keep an open mind.
During my admissions interview, I was complimented by my interviewer for keeping my options open (in my personal statement). She told me that this is a wonderful thing. So, while it may be good to discuss your current interests as I did, you might want to imply that you are open to new experiences, etc. as well.