Sounds like a good deal to me. I mean after all the letter needs to contain reasons why you would be a good pharmacist, and who knows why you would make a good pharmacist better than you. I mean you're willing to sacrifice years of your life and suffer through innnumerable lectures and exams to arrive at that point. Tell them why you think it will be worth it. As far as the adcom's realizing that you haven't known the person all that long, just don't tell them. There's no way they can know how long you've known the person, just don't mention it. As far as ethically I don't think you're bending the rules much, I mean the person does exist and they are going to read the recommendation, so it's not like it's just make believe. Personally I would rather write the recommendation myself so that I can make sure of what is in it and not have someone bad mouth me because of a personal vendetta. Also, nothing against most professionals but I have seen some really worthless rec. letters, from people who either don't have the time, just don't care, or absolutely can't write.