just a note, not every business has the right to refuse service. those that are "public utilities and services" do not. For example, it would be illegal for a water or electric company to refuse service for any reason other than failure to pay. For emergency rooms its even better, they must let everybody see a doctor, regardless of condition. any medical emergency must be treated regardless of price or ability to pay.

other businesses can refuse service for any reason other than creed, color, ethnicity, or gender.

as to whether a pharmacist can legally refuse service, probably, but that doesnt mean that a good lawyer and PR man cant chew them up. Just hire Johnny Cochran.