I personally prefer to say Pharm.D.candidate since it sounds more professional and less awkward.
As a first year student, I used the title "Pharm.D. candidate" in a letter to a therapist where I tried to convince her to discontinue thioridazine for the patient (a relative by marriage), who was taking paroxetine concurrently and exhibiting signs of toxicity and other ill effects. If I had said I was a first year pharmacy student my chances of being taken seriously would have been lower. And, if I had not been able to use a professional sounding title, I do not know that I would have had the guts to voice my concerns in the format that I did.
ps - My dad's name was Richard Peck. He went by "Dick". No joke!