[Prozac]

As I was under eighteen when I visited my doctor and I'm in England, it'll most probably be different than what it was for you. I visited my doctor, handed over a list of 'symptoms' that I had (I found that easier than talking) then the doctor asked me a few questions to confirm what I'd put on the sheet. He asked me general questions in regards to depression (Do you enjoy activities? Are you crying a lot? Feeling hopeless? etc.) and then referred me to the mental health services.
However, when my father went for his depression I believe he had to fill in a questionnaire sheet and was prescribed anti-depressants at his first appointment. I'd imagine it'd be similar for you, as he is an adult.

Take care.