In an academic setting, I've always addressed a PharmD as "Doctor". This formality disappears in the workplace, however. At the hospital where I work as an intern pharmacist, everyone...technicians, interns, and other pharmacists are on a first name basis with each other. Maybe it's better for "esprit d'corp", or maybe it's because a lot of the pharmacists are still RPh/BSPharm and calling PharmD's "Doctor" could cause problems...I think it's the former, most likely. Same thing in retail, it's informal that way. But yes, I've seen "Dr." prefixed to names on lab coats, with "PharmD" as the suffix.