Rejecting an offer of admission I'm interested in applying to pharmacy school and programs for a PhD in chemistry. The PhD programs only admit less than 10 people a year and it's more likely that I won't get in to one of these compared to pharmacy school. The issue is that the pharmacy programs provide admissions offers earlier than when the PhD interviews start. 

Is it acceptable to accept an admission from the pharmacy school and then later reject that offer in favor of an offer from a PhD program? I feel bad for potentially taking up one of the spots in a pharmacy program if I won't be going there.
Read the fine print on the acceptance letter and any links provided.  I doubt you'll find a problem there.  By double-checking, you will be able to proceed with more confidence.