The first visit is usually a full assessment: symptoms, physical and mental health history, current medications, family history and life circumstances. Sometimes tests or coordination with a family doctor are needed. The psychiatrist then explains their understanding and goes through treatment options with you.
If medication is suggested, the psychiatrist explains its purpose, possible effects and side effects and reviews progress at follow up appointments. Never start or stop medication on your own; any change should be agreed with a doctor.
How this compares: psychologists and counsellors are not physicians and do not prescribe; their focus is talk therapy. A psychiatrist is a physician and can consider both sides. Whether an online psychiatrist may prescribe where you live depends on that country's rules.