One thing I've learned over the years: a healthy doctor/patient relationship is a two way dialogue. That means medications should be something discussed, and not simply prescribed without your input on the subject being considered by your doctor/psychiatrist. He shouldn't only suggest medication, but also be willing to answer any questions or concerns you have and take your input into account. Of course, this doesn't really apply if you're committed to an institution But that isn't the case here.

Remember that the success of any medication depends - ultimately - on your willingness to take it. If it doesn't sound like something you're comfortable taking, let the psychiatrist know. If it comes down to it, remind him of the fact that if you have serious reservations about the medication before you've even left his office, then you're not going to be comfortable taking it, and its not something you're likely to stick with.

A doctor-patient relationship is just that: its a two-way street, a dialogue, and your questions should readily and easily be answered, and any concerns addressed to your satisfaction. If it doesn't live up to this fundamental expectation, then long-term (and even short-term) its unlikely to be beneficial and satisfactory. If your psychiatrist is oblivious to this, then you're far better off discovering that sooner than later.

Best of luck.