I was surprised to hear that pharmaceutical science is even a major; it seems unnecessarily narrow for an undergraduate major. The few undergraduate programs I have found it in seem to indicate that the curriculum begins with a foundation in the basic sciences of chemistry, biology, and physics, as well as mathematics. Your upper-level classes are then focused on “aspects of drug design and synthesis, mechanisms of drug action, pharmacology and toxicology, dosage formulation, manufacturing, quality assurance, and regulatory compliance”.
One of the schools with these programs listed careers that majors may pursue:
Consumer safety officers
Drug analysts
Manufacturing/production technologists
Marketing/sales drug detail representatives
Peace Corps/VISTA volunteers
Research associates in: Bioanalysis, drug delivery, drug metabolism, and pharmacokinetics
Science librarians
Peace Corps volunteer isn’t really a career, and anyone can do that. I am skeptical about the research associate thing; I’m pretty sure that most well-paying research associate positions (either at universities or at pharmaceutical companies) require at least an MS. There may be some entry-level research technician positions at some of these places that only require a BS. The science librarian thing made me raise an eyebrow. First of all, librarian position are soooooooo competitive. Second of all, almost all of them require that you have an MLIS/MLS (master’s in library (and information) science), and/or a PhD in a science field. The first half of the list is probably doable, but more achievable if you intend to get a master’s.
But I do believe that the same options are open to you as they are to, say, a chemistry major. In other words, don’t expect a fancy pharmaceutical research position. However, you could probably go into pharmaceutical sales (and the major may give you an advantage, although you could do that with any major). You could also go into healthcare consulting or business, particularly at hospitals and health insurers. It’s probably excellent preparation for pharmacy school.
If you study chemistry on your own time outside of school, that’s an interest. So chemistry or pharmaceutical sciences sounds like a good option for a major for you.