They have a rough idea of how it works, they have a rough idea of what the side effects are. It should be OK. You have a little more of a conversation with your physician and the physician is a little worried because you've been blue, haven't felt like yourself, you haven't been able to enjoy things in life quite as much as you usually do.
Tienen una idea aproximada de cómo funciona, y de cuáles son aproximadamente los efectos secundarios. Debería estar bien. Uno tiene algo más que una conversación con su médico y al médico le preocupa un poco que uno esté desanimado, que no sea uno mismo, que no pueda disfrutar de las cosas de la vida tanto como antes.